Certification - SunLith Energy

UL 9540 vs UL 9540A: Understanding the Key Differences in Energy Storage Certification

September 17, 2025/1 Comment/in Certification, Energy Storage Sysytem, Renewable Energy/by Rahul Jalthar

UL 9540 vs UL 9540A: As the adoption of battery energy storage systems (BESS) grows, safety and compliance remain top priorities for regulators, manufacturers, and end-users. Two of the most recognized standards in this space are UL 9540 and UL 9540A.

Although these terms are often used together, they play very different roles in certification and safety testing. UL 9540 is a system-level certification that validates the overall safety of an energy storage system. In contrast, UL 9540A is a test method that evaluates fire risks, specifically thermal runaway and fire propagation.

At Sunlith Energy, we help manufacturers and developers navigate these certifications to ensure safe and compliant energy storage deployments.

What is UL 9540?

UL 9540 is the Standard for Safety of Energy Storage Systems and Equipment. It ensures that an entire ESS—from batteries and power conversion systems (PCS) to cooling, controls, and housing—meets strict safety requirements.

Key Features of UL 9540:

Scope: Applies to the entire system, not just components.
Integration: Requires batteries certified to UL 1973 and inverters certified to UL 1741.
Safety Focus: Covers electrical, mechanical, thermal, and fire safety aspects.
Market Approval: Often mandatory for utility-scale and commercial projects.

👉 If you’re exploring how PCS technology integrates into storage systems, check our detailed guide on Energy Storage PCS.

What is UL 9540A?

UL 9540A is the Test Method for Evaluating Thermal Runaway Fire Propagation in Battery Energy Storage Systems. Unlike UL 9540, it is not a certification but a test procedure.

This method provides critical data on how batteries behave under extreme conditions. It identifies risks such as fire spread, explosion potential, and gas emissions.

Testing Levels in UL 9540A:

Cell Level – Individual cell behavior under failure.
Module Level – How cells interact inside a battery module.
Unit Level – Fire propagation within a system enclosure.
Installation Level – Real-world system performance in buildings or outdoor setups.

👉 To understand why thermal management matters in these tests, see our post on Cooling Solutions for BESS.

UL 9540 vs UL 9540A: The Core Differences

Feature	UL 9540	UL 9540A
Type	Certification	Test Method
Scope	Full ESS (system-level)	Fire & thermal runaway evaluation
Focus	Electrical, mechanical, and fire safety	Fire propagation, gas hazards
Application	Required for deployment	Supports certification & AHJ approval
Output	Certification mark	Test report (not a certification)

In simple terms:

UL 9540 = Certification for market approval
UL 9540A = Fire safety test to support certification

Why Both UL 9540 and UL 9540A Matter

The two standards work hand-in-hand:

Authorities Having Jurisdiction (AHJs) frequently demand UL 9540A reports before granting installation permits. Manufacturers, meanwhile, use test results to design safer enclosures, improve fire suppression systems, and integrate better thermal management.

👉 For more insights, see our guide on Fire Safety in BESS.

UL 9540 vs UL 9540A: Benefits of Compliance

Meeting both UL 9540 and UL 9540A requirements provides multiple advantages:

Regulatory Compliance: Smooth permitting with AHJs and fire authorities.
Improved Safety: Minimizes risks of fire, explosion, or hazardous gas emissions.
Customer Confidence: Certified systems are more trusted in commercial and utility projects.
Faster Market Access: Certification accelerates deployment timelines.

👉 Explore our complete overview of UL Certifications for Battery Systems for a deeper dive into related standards.

The Future of UL Certifications

UL standards are continuously evolving to address new technologies and risks. For example, the UL 9540A Fifth Edition (March 2025) introduced updates covering:

Hydrogen gas detection requirements
Fire safety for rooftop ESS installations
Stronger casing and housing evaluations

At Sunlith Energy, we monitor these regulatory changes to help our partners stay ahead in compliance and safety.

Conclusion

When comparing UL 9540 vs UL 9540A, the key takeaway is that they are complementary, not alternatives:

UL 9540 is the system-level certification needed for deployment.
UL 9540A is the fire safety test method that enables certification and satisfies regulators.

Together, they provide the foundation for safe, compliant, and market-ready energy storage systems.

👉 Need guidance on achieving compliance? Connect with Sunlith Energy for expert support in certification, testing, and deployment.

UL Certifications for Battery Systems: A Complete Guide

September 14, 2025/9 Comments/in Certification, Energy Storage Sysytem, Renewable Energy/by Rahul Jalthar

Battery Energy Storage Systems (BESS) are becoming essential in today’s energy landscape. Whether for renewable integration, grid stability, or backup power, ensuring the safety and reliability of these systems is critical. This is where UL certifications for battery systems play a crucial role.

UL (Underwriters Laboratories) is one of the most trusted global safety certification organizations. Its standards verify that battery energy storage systems meet strict safety, fire prevention, and performance requirements. For project developers, manufacturers, and operators, understanding these certifications is not optional—it’s necessary.

In this guide, we’ll explore key UL standards such as UL 9540, UL 9540A, UL 1973, and others. You’ll also learn how these certifications impact compliance, insurance, and deployment.

At Sunlith Energy, we help businesses navigate energy storage safety and compliance while building reliable battery solutions.

Why UL Certifications Matter for Battery Energy Storage

1. Safety and Risk Mitigation

Battery systems, if not designed properly, can pose fire hazards or thermal runaway risks. UL standards ensure that systems undergo rigorous testing to minimize these risks.

2. Regulatory Approval

Most jurisdictions require UL-certified equipment for permitting. Without it, projects can face delays, redesigns, or rejection.

3. Market Trust and Bankability

Investors, insurers, and end-users trust certified systems. A BESS with UL certifications demonstrates credibility and long-term reliability.

Key UL Certifications for Battery Systems

UL 9540 – Standard for Energy Storage Systems and Equipment

UL 9540 is the primary certification for energy storage systems. It evaluates the safety, performance, and construction of complete systems, not just individual components.

Covers batteries, Power Conversion Systems (PCS), control systems, and enclosures.
Required for grid-scale, commercial, and residential BESS installations.
Ensures systems meet fire safety and electrical safety standards.

Why it matters: Without UL 9540, your BESS may not receive local authority approval.

👉 Learn more about Energy Storage PCS and how it integrates into certified systems.

UL 9540A – Test Method for Evaluating Thermal Runaway Fire Propagation

UL 9540A is not a certification itself but a test method. It assesses how thermal runaway in one cell can propagate through modules, units, and installations.

Provides data on fire propagation and suppression.
Often required by fire marshals and building authorities.
Supports UL 9540 certification by demonstrating safe design.

👉 Explore our article: UL 9540A Test Method Explained

UL 1973 – Batteries for Use in Stationary and Vehicle Auxiliary Power Applications

UL 1973 focuses on individual battery modules and packs used in stationary systems.

Tests electrical, mechanical, and environmental safety.
Covers BESS, telecom backup, and EV auxiliary batteries.
Often a prerequisite before seeking UL 9540 certification.

Example: A lithium-ion module must first pass UL 1973 before being integrated into a UL 9540-certified system.

UL 1741 – Inverters, Converters, Controllers

Since BESS includes PCS (Power Conversion Systems), UL 1741 applies to inverters and related power electronics.

Validates PCS for interconnection safety with the grid.
Ensures compatibility with renewable energy and microgrids.
Critical for hybrid solar + storage projects.

👉 Read our guide: PCS vs Inverter – Key Differences

UL 1974 – Evaluation for Repurposing Batteries

As second-life batteries become more common, UL 1974 helps ensure repurposed cells are safe for reuse.

Evaluates used EV or industrial batteries for BESS applications.
Supports sustainability by extending battery life.
Ensures recycled batteries meet minimum safety standards.

Benefits of UL-Certified Battery Systems

Regulatory Compliance – Smooth project approvals and grid interconnection.
Enhanced Safety – Reduced risk of fire, explosion, and system failure.
Market Acceptance – Easier financing and insurance.
Long-Term Reliability – Certified systems undergo rigorous life-cycle testing.
Future-Proofing – UL standards evolve with technology, ensuring systems stay relevant.

Challenges in Achieving UL Certification

Cost and Time: Certification requires extensive testing, which can delay projects.
Design Changes: If a component fails testing, redesign may be necessary.
Complex Standards: Navigating multiple UL standards can overwhelm new manufacturers.

This is where industry partners like Sunlith Energy provide support—helping companies design systems aligned with certification requirements from day one.

How Sunlith Energy Helps with UL-Compliant Solutions

At Sunlith Energy, we ensure that every battery system we design aligns with UL safety and certification standards. Our approach includes:

Design Consulting: Guiding OEMs and EPCs on compliance from the design phase.
Testing Support: Preparing systems for UL 9540, UL 9540A, and UL 1973 evaluations.
End-to-End Solutions: Delivering certified-ready BESS with integrated PCS, battery modules, and fire safety systems.

Whether you’re deploying grid-scale storage, C&I projects, or hybrid solar + storage, our certified solutions meet the highest safety benchmarks.

👉 Learn more about our Battery Energy Storage Systems

FAQs on UL Certifications for Battery Systems

1. What is UL certification for battery systems?

It is a safety and performance evaluation that ensures battery energy storage systems meet global standards for fire safety, electrical reliability, and environmental resilience.

2. Do all BESS need UL 9540 certification?

Yes. For commercial and residential deployment in most regions, UL 9540 is mandatory.

3. What’s the difference between UL 9540 and UL 9540A?

UL 9540 certifies the system, while UL 9540A is a test method used to analyze thermal runaway propagation.

4. How long does certification take?

Depending on system complexity, UL certification can take 6–12 months.

5. Can second-life batteries be certified?

Yes, through UL 1974, which evaluates repurposed batteries for safe use in stationary storage.

Conclusion

UL certifications for battery systems are the foundation of safe, compliant, and bankable energy storage projects. From UL 9540 system-level approvals to UL 9540A fire safety testing and UL 1973 battery-level compliance, these standards ensure that energy storage systems perform reliably under real-world conditions.

As energy storage adoption accelerates, ensuring compliance with UL standards will not just be a regulatory requirement—it will be a competitive advantage.

At Sunlith Energy, we’re committed to helping businesses deploy safe, certified, and future-ready energy storage systems.

UL 9540A Test Method: Complete Guide for Battery Energy Storage Safety

UL 9540A Test Method: The Ultimate Guide for Battery Energy Storage Safety

September 14, 2025/2 Comments/in Certification, Energy Storage Sysytem, Renewable Energy/by Rahul Jalthar

UL 9540A Test Method: Battery Energy Storage Systems (BESS) are growing rapidly as renewable energy, electric vehicles, and grid-scale projects expand worldwide. While storage technology brings efficiency and sustainability, it also raises safety challenges—especially related to thermal runaway and fire propagation.

This is where the UL 9540A Test Method plays a vital role. It is the most widely accepted safety test for energy storage systems, referenced by codes such as NFPA 855 and the International Fire Code.

In this guide, we’ll explain:

What UL 9540A is
The four levels of testing
How it relates to UL 9540 and UL 9540B
The major 2025 updates
Why manufacturers and project developers should care

What is the UL 9540A Test Method?

The UL 9540A Test Method for Evaluating Thermal Runaway Fire Propagation in BESS is the only national standard designed to measure how battery systems react under thermal runaway conditions.

It answers critical safety questions such as:

Will a single cell failure spread to neighboring cells?
How will a battery module or system behave in case of fire?
Can suppression systems prevent explosions, flames, or reignition?

Unlike general safety certifications, UL 9540A focuses only on fire propagation risks, making it the go-to test for engineers, installers, and regulators.

Why is UL 9540A Important for BESS?

Battery systems are often installed in homes, businesses, and utility-scale projects. If a fire starts and spreads, it can have devastating consequences. UL 9540A ensures that:

Manufacturers can prove their systems are safe.
Installers get clear installation requirements, such as spacing and suppression.
Authorities have a reliable, consensus-based safety test.

It is directly referenced in NFPA 855, which governs the installation of stationary energy storage systems, making it essential for compliance.

👉 Explore more: CE for BESS: Complete Guide

The Four Levels of UL 9540A Testing

UL 9540A follows a hierarchical four-level structure. Testing may stop early if performance criteria are met.

1. Cell-Level Testing

The test begins with individual cells. The goal is to induce thermal runaway and analyze gas emissions, flames, and heat release.

If cells show no propagation risk, testing can stop here.

2. Module-Level Testing

If cell risks exist, groups of cells (modules) are tested. This step checks whether failures propagate across the module, creating larger hazards.

3. Unit-Level Testing

The full battery system (ESS unit) is tested. Suppression systems are often disabled unless they are built-in. Engineers assess:

Flame spread
Explosion risk
Gas emissions

4. Installation-Level Testing

The final stage evaluates the system in real-world conditions with fire suppression included. It ensures:

No detonation or deflagration
Effective fire suppression
No reignition after the event

👉 Related: What is BESS?

UL 9540A vs. UL 9540 and UL 9540B

It’s easy to confuse these standards, but they serve different purposes:

UL 9540: Certification standard for energy storage equipment. Covers overall safety, performance, and compliance.
UL 9540A: Test method for fire propagation in thermal runaway scenarios. Supports UL 9540 certification.
UL 9540B: Designed specifically for residential-scale BESS, focusing on large-scale fire tests and vent gas ignition.

Together, these standards provide a complete safety framework for energy storage systems.

2025 Updates: What Changed in UL 9540A Fifth Edition?

The fifth edition of UL 9540A, released on March 12, 2025, brings significant improvements to reflect evolving technology and chemistries.

Key Updates:

Optional hydrogen detection and heat flux measurements.
Clarified rest times after conditioning/charging.
Replacement of NFPA 286 fire room with an instrumented wall for residential testing.
More precise thermocouple placement and continuous ramping in cell tests.
Specific temperature limits for module casings.
Extended protocols for new chemistries like lead-acid, NiCd, and flow batteries.
Added requirements for rooftop and open garage installations.

These updates make UL 9540A more adaptable, helping manufacturers meet stricter fire codes and regulators enforce safer installations.

👉 Related: Green Hydrogen Storage

Who Needs UL 9540A Testing?

UL 9540A applies to:

Battery manufacturers – proving technology safety.
BESS integrators – ensuring compliance with NFPA 855 and local fire codes.
Developers and EPCs – gaining project approvals faster.
Home and commercial installers – understanding spacing and suppression requirements.

Without UL 9540A testing, it becomes nearly impossible to get approval for large BESS installations in the U.S.

Benefits of UL 9540A Testing

Compliance: Meets NFPA 855 and IFC requirements.
Design Optimization: Provides data for safe spacing and fire suppression.
Market Access: Required for many U.S. and Canadian projects.
Risk Reduction: Lowers fire and explosion risks in installations.

Conclusion

The UL 9540A Test Method is the backbone of energy storage safety in 2025. With its updated fifth edition, it provides a clear, science-based framework to evaluate thermal runaway risks at cell, module, unit, and installation levels.

For manufacturers, passing UL9540A testing means faster certifications, safer designs, and wider market acceptance. For regulators and installers, it provides confidence that battery energy storage systems meet the highest safety standards.

As BESS technology evolves, UL 9540A will continue to be the key standard shaping how we store renewable energy safely and effectively.

👉 Learn more: UL Certifications for Battery Systems

FAQs: UL 9540A Test Method

Q1. What is the UL 9540A Test Method?

The UL 9540A Test Method is a fire safety test designed to evaluate the thermal runaway characteristics of battery energy storage systems (BESS). It helps manufacturers and system designers understand how a battery reacts under stress, including fire, gas release, and propagation risks.

Q3. How does UL 9540A differ from UL 9540 certification?

UL 9540 is a system-level certification for battery energy storage systems, while UL 9540A is a fire test method. UL 9540A is often used to provide supporting safety data required to achieve UL 9540 certification or to meet local fire codes.

Q2. Why is UL 9540A testing important for energy storage systems?

UL 9540A testing provides critical data for fire safety, helping system integrators, regulators, and building authorities approve energy storage projects. It ensures that batteries are safe for use in residential, commercial, and grid-scale installations.

Q4. What are the levels of UL 9540A testing?

UL 9540A includes four test levels:

Cell level – Tests how a single cell behaves in thermal runaway.
Module level – Examines propagation within a battery module.
Unit level – Assesses fire and gas risks in the entire system.
Installation level – Evaluates safety in a real-world installed environment.

For more details on BESS safety, see our guide on energy storage PCS.

Q5. Who requires UL 9540A testing?

UL 9540A testing is often required by:

Battery manufacturers seeking UL 9540 certification.
System integrators installing BESS in commercial or residential sites.
Authorities Having Jurisdiction (AHJs) and fire marshals reviewing projects.

Learn more about BESS certifications required glo

Q6. What are the latest updates in UL 9540A (Fifth Edition, 2025)?

The March 2025 update to UL 9540A (5th Edition) added requirements for:

Hydrogen detection sensors.
Module casing integrity.
Testing for rooftop energy storage systems.

Check our post on battery regulations in the EU for related compliance u

Q7. Does passing UL 9540A mean a battery is certified?

No, UL 9540A is not a certification. It is a test method that provides data used to achieve UL 9540 certification or to comply with fire codes. Certification comes from successfully meeting UL 9540 requirements.

Q8. How long does UL 9540A testing take?

The duration depends on system size and complexity. A full series of tests (cell, module, unit, installation) can take several weeks to months, depending on scheduling and regulatory requirements.

Q9. Can UL 9540A testing be skipped if a battery is already safe?

No. Even if a system has proven safety records, AHJs and certification bodies often require UL 9540A data as part of the approval process, especially for large-scale installations.

Q10. How does UL 9540A testing impact project approval timelines?

Providing UL 9540A data often accelerates permitting and approval by demonstrating compliance with NFPA 855, IFC, and local fire codes. Without it, projects may face delays or additional scrutiny.

CE for BESS: Complete Guide to Battery Energy Storage Certification

August 30, 2025/5 Comments/in Certification, Energy Storage Sysytem/by Rahul Jalthar

Battery Energy Storage Systems (BESS) are critical to the clean energy transition, but ensuring their safety and compliance requires more than just good engineering. Certifications like CE for BESS is one of the most recognized marks in Europe, confirming that a product meets essential health, safety, and environmental standards. However, while CE is necessary for entering the EU market, it does not always guarantee complete system-level safety. To build global trust, manufacturers often combine CE with other certifications such as UL and IEC, ensuring stronger compliance, reliability, and market acceptance.

What Does CE Certification Mean for BESS?

The CE mark (Conformité Européenne) is a mandatory certification for products entering the European Economic Area (EEA). For BESS, CE shows compliance with EU directives and harmonized standards.

When a BESS carries the CE mark, it declares conformity with the following directives:

Low Voltage Directive (LVD) – Protects against electrical hazards.
Electromagnetic Compatibility (EMC) Directive – Prevents electrical interference.
Restriction of Hazardous Substances (RoHS) – Limits toxic chemicals in batteries and components.
General Safety Directives – Cover risks related to machinery and consumer use.

In essence, CE for BESS confirms that the system has met basic EU safety and environmental requirements, allowing it to be legally marketed and installed in Europe.

What Does CE for BESS Cover?

CE certification for BESS evaluates multiple aspects of product safety. These include:

Electrical Safety – Preventing risks of electric shock, short circuits, and overheating.
Thermal Safety – Assessing insulation, cooling design, and fire prevention.
Electromagnetic Compatibility (EMC) – Ensuring the BESS does not emit disruptive signals.
Environmental Safety – Controlling hazardous substances and ensuring recyclability.

However, CE certification for BESS is primarily based on a self-declaration of conformity. Manufacturers test the product internally or through a notified body, then issue a Declaration of Conformity (DoC).

This process makes CE less complex compared to third-party certifications like UL or IEC, which require independent validation and rigorous lab testing.

Why Do Most Companies Choose Only CE Certification for BESS?

Many BESS companies stop at CE certification instead of pursuing more demanding approvals. The main reasons include:

Lower Costs: CE testing is more affordable than UL or full IEC certification, which involve expensive third-party audits.
Faster Market Entry: CE certification is quicker, often taking weeks instead of months.
Simpler Process: CE allows self-declaration, reducing reliance on external labs.
Minimum Requirement: Since CE is mandatory in the EU, many companies view it as the lowest barrier to entry.

In other words, CE is often seen as the easiest, fastest, and cheapest way to access the European market. But relying on CE alone raises important safety concerns.

Is CE Alone Enough for BESS Safety?

The answer is no. While CE for BESS ensures legal entry into the EU market, it does not fully address the complex safety risks of modern energy storage systems.

BESS involves large-scale lithium-ion batteries, which can pose hazards like:

Thermal Runaway – Fire and explosion risk if cells fail.
High Voltage Risk – Danger of electric shock during installation or maintenance.
System-Level Failure – Risks from inverters, converters, or control systems.

To mitigate these risks, global safety standards go far beyond CE. Manufacturers often need UL, IEC, or national certifications depending on their target markets.

Key International Standards Beyond CE for BESS

Here are the most important certifications that complement CE for BESS:

1. IEC Standards (International)

2. UL Standards (North America)

UL 9540: Safety requirements for complete BESS systems.
UL 1973: Safety of battery modules for stationary applications.
UL 9540A: Test method for thermal runaway fire propagation.

3. National Certifications

BIS (India): Mandatory for lithium-ion cells and BESS units.
TISI (Thailand): Battery certification for safety and performance.
KC (Korea): Compliance for batteries and power systems.
PSE (Japan): Electrical safety approval.

Together, these standards ensure that a BESS is safe, grid-compatible, and globally marketable.

CE vs UL vs IEC: Key Differences

Certification	Region	Scope	Testing Requirement	Market Perception
CE	Europe	Basic health, safety, EMC	Self-declaration or notified body	Entry-level compliance
UL 9540	USA/Canada	Full system safety	Third-party lab required	High credibility
IEC 62619 / 62933	Global	Battery + system safety	Third-party testing	Widely respected
BIS / KC / PSE	National	Country-specific safety laws	Mandatory local tests	Legal requirement

This table shows why CE is the easiest to achieve but IEC and UL carry higher safety credibility.

Why BESS Needs Multiple Certifications

Unlike small electronics, BESS operates at industrial-scale energy levels, which makes multi-layer certification essential.

CE ensures compliance in Europe, but it does not evaluate system-level fire safety.
UL validates complete system safety and is trusted in North America.
IEC sets a global benchmark, especially for grid integration.
National standards guarantee local approval, allowing sales in markets like India, Japan, or Korea.

Therefore, CE should be seen as the foundation, while UL, IEC, and national approvals are the reinforcements. Together, they create a safe and credible BESS product.

Why Companies Should Go Beyond CE for BESS

Although CE is attractive for cost and speed, relying on it alone can lead to challenges:

Limited Market Reach: CE only works in Europe, not globally.
Lower Buyer Confidence: Utilities and large clients often demand UL or IEC reports.
Safety Risks: CE’s self-declaration model may overlook thermal runaway or fire propagation risks.
Regulatory Pressure: More countries are adopting stricter BESS safety laws.

Companies that invest in full certification portfolios gain stronger market access, brand reputation, and customer trust.

Conclusion: CE is Essential but Not the Final Step

CE for BESS is a mandatory starting point for European market access. It ensures compliance with basic safety, EMC, and environmental standards. However, CE is not enough to prove the full safety of complex battery energy storage systems.

Most companies choose CE because it is fast, affordable, and easy, but long-term success requires additional certifications like UL 9540, IEC 62619, and BIS. These provide independent validation, global acceptance, and higher safety assurance.

In the evolving energy landscape, BESS manufacturers and project developers must go beyond CE certification to build trust, reliability, and international growth opportunities.

❓ Frequently Asked Questions About CE for BESS

1. What is CE certification for BESS?

CE certification for Battery Energy Storage Systems (BESS) is a European conformity mark that shows the product meets essential EU safety, health, and environmental requirements. It’s a legal requirement for selling BESS in the European Economic Area (EEA).

2. Does CE certification cover fire safety in BESS?

No. CE certification ensures compliance with core directives but does not specifically address thermal runaway or fire safety risks. For complete system safety, manufacturers often pursue additional certifications like UL 9540A (fire safety) or IEC 62619 (battery cell safety).

3. How is CE different from UL or IEC certification?

CE Certification: Mandatory for the EU market, focuses on regulatory compliance.

UL Certification: Recognized mainly in North America, emphasizes product safety and fire prevention.

IEC Standards: Internationally accepted, providing detailed technical guidelines for testing and performance.

Using CE alone may open EU markets, but UL and IEC certifications build global trust and credibility.

4. Can I sell CE-certified BESS outside Europe?

Not necessarily. While CE certification allows access to EU markets, other regions like the US, Middle East, and Asia-Pacific often require local standards such as UL, BIS, or GB/T. Companies targeting global markets usually combine CE with additional certifications.

5. How long does CE for BESS take?

The timeline depends on the complexity of the BESS and the scope of testing. In general:

Large, complex systems: 3–6 months
Working with an accredited testing lab or certification body can speed up the process.

Simple systems: 4–8 weeks

6. Why is CE certification alone not enough for BESS safety?

Because BESS safety risks go beyond basic compliance. Issues like thermal runaway, grid stability, and fire containment need deeper testing. That’s why CE is often just the starting point, with UL, IEC, and country-specific certifications adding the necessary system-level validation.

IEC 62933: Global Standard for Grid Energy Storage Systems

August 25, 2025/9 Comments/in Certification, Energy Storage Sysytem, Renewable Energy/by Rahul Jalthar

As renewable energy adoption grows, energy storage systems (ESS) have become critical for balancing supply and demand, improving reliability, and supporting grid resilience. To ensure safety, performance, and interoperability, the International Electrotechnical Commission (IEC) developed the IEC 62933 series, a set of globally recognized standards.

These standards guide manufacturers, developers, and policymakers in designing and deploying safe, efficient, and sustainable storage solutions.

What is IEC 62933?

The IEC 62933 series establishes a framework for electrical energy storage (EES) systems, including grid-scale and commercial applications. It covers general requirements, safety, performance, environmental considerations, and grid integration.

Rather than being a single document, IEC62933 is a family of interlinked standards, each addressing a specific aspect of EES.

Breakdown of Key IEC 62933 Standards

IEC 62933: Global Standard for Safe and Reliable Energy Storage Systems

Here’s a detailed overview of the most important parts:

1. IEC 62933-1 – General Requirements

Defines basic concepts, classifications, and terminology for EES.
Provides common ground for stakeholders (manufacturers, regulators, utilities).
Establishes a systematic approach to planning, designing, and evaluating ESS.

2. IEC 62933-2-1 – Performance Testing for EES Systems

Sets methods to evaluate performance of storage systems.
Covers energy efficiency, response time, storage capacity, and life cycle.
Ensures consistent benchmarks for comparing technologies.

3. IEC TS 62933-2-2 – Functional Safety Assessment

A Technical Specification (TS) focusing on safety from a system function perspective.
Addresses potential hazards (thermal runaway, electrical failures).
Provides methods for risk identification and mitigation.

4. IEC TS 62933-2-3 – Reliability of Energy Storage Systems

Defines testing and assessment methods for reliability.
Covers failure rates, durability, and long-term system resilience.
Helps ensure stable operation in grid-critical applications.

5. IEC TR 62933-2-201 – Guidance on Safety Cases

A Technical Report (TR) providing practical guidance for ESS safety cases.
Supports developers and operators in building safety documentation.
Bridges the gap between technical standards and real-world applications.

6. IEC 62933-4-2 – Environmental Impact of EES Systems

Focuses on environmental assessment of energy storage technologies.
Considers carbon footprint, material use, and recycling practices.
Encourages sustainable deployment of large-scale ESS.

7. IEC 62933-4-4 – End-of-Life Management

Provides guidelines for decommissioning, recycling, and disposal of EES.
Promotes circular economy practices in the storage industry.
Reduces environmental risks associated with battery waste.

8. IEC 62933-5-1 – General Safety Considerations

Covers general safety requirements for stationary energy storage.
Includes electrical, chemical, mechanical, and fire safety aspects.
Ensures system safety across all technologies (batteries, flywheels, etc.).

9. IEC 62933-5-2 – Safety for Large-Scale EES

Focuses specifically on large battery energy storage systems (BESS).
Addresses thermal runaway prevention, emergency response, and system protection.
Critical for utility-scale storage projects.

10. IEC 62933-5-3 – Grid Integration Safety

Examines safety aspects during grid connection and operation.
Ensures ESS does not destabilize or endanger grid infrastructure.
Supports secure deployment in smart grids and microgrids.

Importance of IEC 62933 for the Industry

The IEC 62933 series provides:

Global Standardization – unifies practices worldwide.
Risk Reduction – prevents failures in high-risk ESS installations.
Sustainability – ensures safe end-of-life handling.
Investor Confidence – promotes compliance and long-term reliability.
Innovation Support – enables safe integration of emerging technologies like solid-state and hybrid storage.

Conclusion

The IEC62933 standard family is the backbone of global energy storage deployment. From general guidelines (IEC62933-1) to detailed safety (IEC62933-5-2) and environmental sustainability (IEC62933-4-4), it ensures storage systems are safe, efficient, and future-ready.

Adopting these standards is essential for manufacturers, developers, and regulators who aim to accelerate the clean energy transition while ensuring safety and reliability.

Worldwide Certification Guide for Power Conversion Systems (PCS)

August 15, 2025/2 Comments/in Certification, Energy Storage Sysytem, PCS/by Rahul Jalthar

PCS Certification Guide: In the booming Battery Energy Storage System (BESS) market, the Power Conversion System (PCS) plays a crucial role. It acts as the bidirectional bridge between batteries, renewable energy sources, and the electrical grid—converting DC to AC and vice versa.

However, no PCS can be legally sold or installed without meeting strict certification requirements. These certifications ensure:

Safety – Protecting operators, assets, and the grid.
Compliance – Meeting local and international regulations.
Market Access – Enabling entry into global markets without costly redesigns.

This guide breaks down worldwide PCS certification requirements, region by region, so manufacturers, EPCs, and integrators know exactly what’s needed.

1. What Is a Power Conversion System (PCS)?

A Power Conversion System is a high-efficiency electronic converter that:

Converts DC from batteries/PV to AC for the grid or loads.
Converts AC from the grid to DC for battery charging.
Supports grid stability functions such as frequency control and voltage regulation.

If the BESS is the body, the PCS is the heart that pumps energy where it’s needed.

2. Worldwide PCS Certification Requirements

A. International Certifications

Standard	Scope	Why It Matters
IEC 62109-1 & 62109-2	Safety of power converters for PV and ESS	Ensures PCS meets operator and installer safety
IEC 62477-1	Safety for power electronic converters	Covers high-power PCS in BESS
IEC 61000 Series	EMC compliance	Prevents harmful interference
ISO 9001:2015	Quality management	Ensures consistent production quality
IEC CB Scheme	Mutual recognition of test results	Avoids repeated testing for multiple markets

B. North America

Standard	Scope	Note
UL 1741 & UL 1741 SB	Inverters, converters, controllers for DER	UL 1741 SB aligns with IEEE 1547-2018
IEEE 1547 & 1547.1	Grid interconnection	Mandatory for PCS grid connection
CSA C22.2	Safety requirements for Canada	Harmonized with UL standards

C. Europe

Standard	Scope	Note
EN 50549-1 / -2	Generating plant requirements	Covers PCS grid integration
EN 62477-1	Safety for power electronics	Required for high-voltage PCS
EN 61000	EMC compliance	Prevents interference
G99 (UK)	Grid code compliance	UK-specific requirement

D. Australia & New Zealand

Standard	Scope	Note
AS/NZS 4777.2	Grid-connected inverter requirements	Includes PCS
RCM Mark	EMC & safety	Required before market entry

E. South Africa

Standard	Scope	Note
NRS 097-2	Grid connection rules	Addresses voltage, frequency, harmonics

F. China

Standard	Scope	Note
GB/T 34120 & GB/T 34133	PCS safety & performance	Required for ESS & PCS
GB/T 29319	EMC standards	Local testing required

G. India

Standard	Scope	Note
BIS IS 16221 & IS 16270	PCS safety	Mandatory BIS registration
CEA Grid Code	Interconnection rules	Adapted for Indian grid

H. Japan

Standard	Scope	Note
JIS C 8961 & C 8999	PCS performance & safety	Japanese Industrial Standards
JET Certification	Electrical & performance safety	Required for PCS sales
PPSA Compliance	Grid approval	Utility-specific process

I. South Korea

Standard	Scope	Note
KS C 8567 / KS C 8568	PCS safety standards	Korean Standards
KC Mark	EMC & safety	Mandatory product mark
KEPIC / KERI Testing	Grid compliance	Overseen by KESCO

J. Southeast Asia

Thailand

Standard	Scope	Note
TISI Certification	PCS safety	Thailand Industrial Standards Institute
MEA/PEA Grid Code	Utility approval	For PCS connection to the grid

Singapore

Standard	Scope	Note
SPRING / Enterprise SG	Electrical safety	National compliance mark
EMA Grid Connection	Energy Market Authority approval	Required for grid-tied PCS

Indonesia

Standard	Scope	Note
SNI Certification	Indonesian National Standard	Safety & quality compliance
PLN Grid Code	Utility connection rules	Approval from PLN

K. Middle East

United Arab Emirates (UAE)

Standard	Scope	Note
ESMA Certification	Safety & EMC	Emirates Authority
DEWA / ADWEA Grid Code	Utility compliance	Grid-tied PCS requirement

Saudi Arabia

Standard	Scope	Note
SASO Certification	Safety & quality	Saudi Standards Org.
SEC Grid Connection	Utility approval	Saudi Electricity Company rules

Qatar, Oman, Kuwait

Typically adopt IEC standards + local utility grid codes.

L. Latin America

Country	Standard	Note
Brazil	INMETRO + ONS Grid Code	Safety & grid compliance
Chile	SEC Approval + Grid Code	Energy regulatory approval
Mexico	NOM + CFE Grid Rules	Safety & interconnection

3. International Certification Pathways

The IECEE CB Scheme simplifies global compliance:

Test once in a CB-certified lab.
Use the report for multiple country approvals.
Cuts time-to-market significantly.

4. PCS Certification Process

Identify Target Markets
Match Applicable Standards
Pre-Test in Internal Lab
Submit to Accredited Testing Body
Receive Certificates
Maintain Compliance via periodic re-testing.

5. Challenges & Future Trends

Challenges

Varying grid codes by region
Rapid updates to standards (e.g., IEEE 1547)
New cybersecurity requirements

Trends

Cybersecurity Compliance (IEC 62443)
Green Certification Labels
Gradual harmonization of standards globally

Conclusion

The PCS is the gateway between your Battery energy storage system and the grid—but without the right certifications, it’s just an expensive box.
By understanding global PCS requirements early, manufacturers and integrators can avoid delays, reduce costs, and enter multiple markets faster.

EU Regulations for Battery Energy Storage Systems (BESS): What You Need to Know in 2026

August 7, 2025/2 Comments/in Certification, Energy Storage Sysytem, Industry News, Renewable Energy/by Rahul Jalthar

EU Regulations for Battery Energy Storage Systems:Battery Energy Storage Systems (BESS) are at the heart of Europe’s clean energy transition. By storing renewable electricity, they stabilize grids, reduce fossil fuel dependency, and enable smarter energy management. But with great opportunity comes strict regulation.

The European Union (EU) has introduced comprehensive rules to ensure that battery systems are safe, sustainable, and ethically sourced. For manufacturers, developers, and operators, understanding these regulations is critical to avoid penalties and stay competitive.

In this guide, we break down the EU Regulations for Battery Energy Storage Systems, highlight key compliance requirements, and provide a practical roadmap for companies preparing for 2026 and beyond.

Why the EU Is Tightening Battery Regulations

Europe’s ambitious climate goals—cutting greenhouse gas emissions and reaching net-zero by 2050—require a rapid scale-up of renewable energy and storage solutions. BESS plays a central role in integrating solar and wind into the grid.

However, batteries also pose risks:

Environmental impact from mining and disposal
Fire hazards if improperly managed
Supply chain concerns around critical raw materials

That’s why the EU replaced the older Battery Directive (2006/66/EC) with the EU Battery Regulation (2023/1542), introducing stricter sustainability, safety, and transparency rules.

👉 Related Reading: CE for BESS – Complete Guide to Certification

Key EU Regulations Affecting Battery Energy Storage Systems

1. The EU Battery Regulation (EU 2023/1542)

This regulation entered into force on February 18, 2024, and will fully replace the previous Battery Directive by August 2025. It applies to all batteries sold in the EU, including industrial batteries used in energy storage systems.

Main requirements include:

Substance restrictions: Limits on hazardous materials such as mercury, cadmium, and lead.
Labeling & QR codes: Clear labeling of capacity, hazards, and recycling information, along with a scannable QR code.
CE marking: Batteries must carry CE certification, showing compliance with EU directives.
Battery Passport: From February 2027, all industrial batteries >2 kWh must include a digital “Battery Passport” with details on composition, carbon footprint, and recyclability.
Due diligence obligations: Large producers (turnover > €40M) must implement supply chain policies to ensure responsible sourcing.

2. Extended Producer Responsibility (EPR)

The EU applies Extended Producer Responsibility (EPR) to all batteries, including BESS. This means that producers must finance:

Collection and recycling programs
End-of-life treatment
Safe disposal methods

To meet obligations, companies can join Producer Responsibility Organisations (PROs), which handle compliance on their behalf.

This ensures that batteries don’t end up in landfills but are reused or recycled into the supply chain.

3. Clean Energy and Market Integration Rules

BESS isn’t just about hardware—it’s also about market access. The EU’s Clean Energy Package (2019) gives storage systems fairer treatment in electricity markets.

Key highlights:

BESS can participate in wholesale, balancing, and capacity markets.
Grid operators must treat storage fairly, avoiding double charging.
Developers benefit from streamlined permitting under the Net-Zero Industry Act (2024).
The Critical Raw Materials Act (2024) introduces stricter monitoring of strategic materials like lithium and cobalt.

Together, these measures aim to create a level playing field for battery operators while ensuring Europe’s independence from risky supply chains.

4. Safety Standards and Best Practices

Safety is a top concern for utility-scale battery projects. In 2025, the European Association for Storage of Energy (EASE) published Guidelines on Safety Best Practices, covering product design, site management, and emergency response.

For compliance, BESS projects must consider:

Voltage thresholds: DC ≤ 1500 V, AC ≤ 1000 V.
Minimum capacity: Systems above 20 kWh fall under stricter rules.
System-level testing: Incorporating IEC and CE standards into project certification.

👉 Related Reading: IEC Certifications for BESS

By following international standards like IEC 62619, IEC 62933, and IEC 61000, developers ensure their systems are both safe and insurable.

EU Regulations for Battery Energy Storage Systems: Compliance Checklist for Stakeholders

Different players in the BESS ecosystem face different obligations under EU regulations.

Stakeholder	Key Compliance Actions
Manufacturers	Substance restrictions, CE marking, integrate Battery Passport, supply chain audits
Producers	Join PROs, fund recycling & collection, manage EPR obligations
Developers	Align with EASE guidelines, secure CE & IEC certification, follow permitting rules
Utilities/Operators	Ensure system transparency (SoC, SoH data), integrate grid codes, meet clean energy rules
Investors	Require compliance proof before funding, reduce risk through certification checks

EU Regulations for Battery Energy Storage Systems: Why Compliance Matters for BESS Growth

Meeting EU regulations isn’t just about avoiding fines. It also delivers business benefits:

Market access: Non-compliant batteries cannot be sold in the EU.
Investor confidence: Certified and compliant projects attract easier funding.
Insurance & warranties: Insurers demand CE and IEC-certified systems.
Sustainability advantage: Battery Passport helps companies demonstrate green credentials.

In short, regulatory compliance is now a competitive differentiator in the fast-growing BESS sector.

Conclusion: EU Regulations for Battery Energy Storage Systems Preparing for 2026 and Beyond

The EU has set a high bar for Battery Energy Storage Systems. From CE marking and Battery Passports to EPR obligations and safety guidelines, every stakeholder must act now to prepare for full enforcement in 2025–2027.

For BESS companies, compliance isn’t a box-ticking exercise—it’s the foundation for long-term growth in the European market.

👉 Next Step: Explore our in-depth guides on CE Certification for BESS and IEC Certifications for BESS to strengthen your regulatory strategy.

BIS certification for lithium-ion batteries in India — compliance and standards overview.

🧾 BIS Certification for Lithium-Ion Batteries in India: Complete Guide for 2025

July 16, 2025/4 Comments/in Certification/by Rahul Jalthar

⚡ Introduction: Why BIS Certification Matters for Lithium-Ion Batteries

The demand for lithium-ion batteries in India is growing rapidly, driven by the electric vehicle (EV) boom and the expansion of energy storage systems (ESS). To ensure safety, reliability, and quality, the Bureau of Indian Standards (BIS) mandates BIS Certification under the Compulsory Registration Scheme (CRS).

BIS certification validates that batteries meet India’s strict safety and performance standards — protecting consumers and ensuring market trust.

In short: No lithium-ion battery can be legally sold in India without BIS registration.

🔍 What Is BIS Certification?

The Bureau of Indian Standards (BIS) operates under the Ministry of Consumer Affairs, Government of India, and oversees product safety across multiple categories, including electrical, electronics, and battery systems.

For lithium-ion batteries, the BIS certification is issued under IS 16046 (Part 1 and Part 2) standards, which align closely with IEC 62133-1 and IEC 62133-2.

These ensure:

Safe design and cell structure
Protection against thermal runaway
Reliable charging and discharging
Prevention of short-circuit or overvoltage damage

🔗 BIS Official Website Link: Official BIS Portal – Compulsory Registration Scheme

🧩 Why BIS Certification Is Important

Importance of BIS certification for EVs and energy storage systems in India.

Legal Compliance: Mandatory under the Electronics and IT Goods (Requirements for Compulsory Registration) Order.
Safety Assurance: Prevents risks such as overheating, leakage, or fire.
Market Access: Allows legal sales and distribution in India.
Consumer Trust: Enhances brand credibility and acceptance.
Export Advantage: Shows global buyers that Indian-made batteries meet rigorous standards.

🔗 Read More about UL Certifications for BESS: Learn more about UL Certifications for Battery Systems →

⚙️ Types of Batteries That Require BIS Certification

Types of lithium-ion cells under BIS certification requirements.

BIS certification applies to all lithium-ion batteries, including:

Cylindrical cells
Prismatic cells
Pouch cells
Battery packs used in EVs, solar storage, and portable electronics

Each type must undergo independent testing in a BIS-recognized laboratory.

🧾 BIS Certification Process for Lithium-Ion Batteries

Process flow for BIS certification testing and approval for lithium-ion batteries.

The process follows a clear and structured workflow:

Product Testing: Submit battery samples to a BIS-recognized laboratory.
Documentation: Provide technical specifications, test reports, and company details.
Evaluation: BIS officers review compliance with IS 16046 and CRS requirements.
Grant of License: Once approved, BIS issues a unique CRS number for your product.
Ongoing Compliance: Regular audits and periodic sample re-testing ensure continued conformity.

🔗 BIS Official Website Link: BIS Laboratory Recognition Scheme

Who Needs BIS Certification in India?

BIS registration applies to:

Indian manufacturers of lithium-ion cells or packs.
Foreign manufacturers exporting batteries to India.
Importers or brand owners selling products that include lithium cells (like e-bikes, ESS, or power banks).

Foreign manufacturers must appoint an Authorized Indian Representative (AIR) to manage their application.
You can learn about AIR responsibilities in the BIS Certification Process page.

Step-by-Step Process for BIS Registration

1. Identify the correct product category
Confirm your cell or pack falls under IS 16046 (Part 2): 2018.

2. Appoint an AIR (for foreign brands)
The AIR acts as the legal point of contact in India.

3. Send samples to a BIS-approved lab
Testing includes mechanical, electrical, and thermal safety tests.

4. Receive valid test reports
Reports older than the allowed period (commonly 90 days) are not accepted.

5. Submit the BIS online application
Upload your documents, test reports, and undertakings via the BIS Smart Registration portal.

6. BIS review and certification
The Bureau reviews, queries if necessary, and grants registration once approved.

The average BIS certification timeline ranges from 6 to 12 weeks, depending on test readiness and documentation accuracy.

Testing Requirements under IS 16046 (Part 2)

BIS mandates several tests to ensure safety and reliability:

Overcharge and overdischarge tests
Short-circuit and thermal abuse tests
Vibration and mechanical shock tests
Drop, crush, and impact evaluations
Forced discharge and temperature cycling

Testing must be done at BIS-recognized Indian laboratories only.
See the CRSBIS recognized labs list for current approvals.

Validity, Renewal, and Modifications

A BIS registration typically remains valid for two years and can be renewed before expiry.
If your battery design, chemistry, or form factor changes, you may need inclusion or re-certification.

Always inform BIS of any updates to avoid suspension.
For guidance, consult BIS’s Product Certification FAQs.

Cost and Time Estimates

Activity	Typical Duration	Cost Factors
Lab testing	2–8 weeks	Sample complexity, lab backlog
Application & review	2–6 weeks	Queries or re-submission
Renewal	Within 2 years	Administrative and testing fees

Costs vary by product, testing scope, and chosen lab.
Budget for re-testing, document translation, and AIR service fees if applicable.

Quick BIS Application Checklist

Verify your product under IS 16046 (Part 2): 2018
Appoint an Authorized Indian Representative (if foreign)
Prepare technical documents (schematics, BOM, manual)
Send samples to a BIS-recognized lab
Receive a valid test report (within validity window)
Submit the online application via BIS portal
Maintain labeling and traceability records
Plan renewal at least 2 months before expiry

Benefits of BIS Certification

Legal entry to the Indian market
Enhanced brand reputation and safety credibility
Easier access to EV, solar, and energy storage tenders
Compliance with “Make in India” and safety mandates
Consumer trust through verified performance

If your goal is to supply battery energy storage systems (BESS) or EV packs in India, BIS certification ensures your design meets national standards.

🔋 BIS vs UL Certification: What’s the Difference?

Criteria	BIS (India)	UL (Global)
Authority	Bureau of Indian Standards	Underwriters Laboratories
Scope	Indian domestic market	International / export markets
Standard	IS 16046 (IEC 62133)	UL 2054, UL 2271, UL 2580
Focus	Safety & legal compliance	Performance & export safety
Certification Need	Mandatory in India	Mandatory for exports & EVs

🔗 Read more here: Compare UL 2054, UL 2271, and UL 2580 Certifications →

🧰 Common Challenges in BIS Certification

Testing Delays: Due to limited BIS-recognized labs.
Complex Documentation: Requires technical accuracy.
Component Traceability: Imported cells must show source compliance.
Frequent Standard Updates: IS 16046 revisions can impact timelines.

💡 Tip: Partnering with a certified integrator like SunLith Energy helps streamline compliance and ensure up-to-date certification.

⚡ BIS for EV, Solar, and Energy Storage Systems

BIS certification isn’t limited to small devices — it’s equally crucial for EV batteries, solar storage units, and industrial battery systems.

SunLith Energy’s advanced BESS solutions comply with BIS and other global standards, ensuring safe and efficient operation across commercial and industrial applications.

🔗 Read more here: Explore SunLith Energy’s C&I Battery Energy Storage Systems →

🧠 Future of BIS Certification in India

The Government of India continues strengthening its battery standardization policies, aligning with global frameworks like UN 38.3 and ISO 9001:2015.

In coming years, expect:

Expansion to cover solid-state and semi-solid lithium technologies.
Integration with Battery Passport regulations for traceability.
Stronger testing oversight for EV safety and fire resistance.

❓ FAQ: BIS Certification for Lithium-Ion Batteries

BIS certification FAQs for lithium-ion batteries in India.

Q1. Is BIS certification mandatory for lithium-ion batteries?

✅ Yes. All lithium-ion cells and packs must be BIS-certified before sale in India.

Q2. How long does the BIS certification process take?

⏱️ Typically 1–4 months, depending on testing queue and document accuracy.

Q3. Can imported batteries be sold without BIS?

❌ No. Even imported batteries must register under CRS before being marketed in India.

Q4. Does BIS certification cover EV batteries?

✅ Yes. All electric vehicle battery packs must comply with BIS standards.

Q5. Can I use a foreign lab test report?

❌ No. BIS accepts test reports only from BIS-recognized labs in India.

Q6. What happens if my battery design changes?

Major design or chemistry changes require re-certification or inclusion.

Q6. Do I need BIS if my battery already has UL or IEC certification?

✅ Yes. Indian BIS registration is mandatory, even if you hold foreign safety marks.

Q7. How often must BIS be renewed?

Renew every two years or as defined in your certificate terms.

📈 Conclusion: Ensuring Battery Safety Through BIS

BIS certification is the foundation of battery safety in India. It not only ensures compliance but also builds trust among consumers, EV manufacturers, and energy solution providers.

At SunLith Energy, we support clients from design to compliance — including UL, BIS, and IEC certifications — to accelerate product launch with confidence.

By staying ahead with SunLith Energy’s BIS-compliant battery systems, your products remain reliable, future-ready, and globally competitive.

🔗 Visit: SunLith Energy – Advanced Battery Solutions for India →

IEC Certifications for BESS: The Global Standard for Safety, Performance & Compliance

May 29, 2025/12 Comments/in Certification/by Rahul Jalthar

IEC Certifications for BESS: Battery Energy Storage Systems (BESS) are at the heart of modern energy transition—bridging renewables with grid reliability, enabling peak shaving, and powering homes, businesses, and microgrids. However, with great power comes great responsibility—ensuring these systems are safe, reliable, and compliant. This is where IEC certifications become non-negotiable.

Whether you’re a manufacturer, developer, investor, or end-user, understanding IEC standards for BESS is essential. Let’s explore what they are, why they matter, and how they ensure your system meets international benchmarks.

What Is IEC?

The International Electrotechnical Commission (IEC) is a global organization that prepares and publishes international standards for all electrical, electronic, and related technologies. IEC standards are widely accepted across countries, making them a crucial part of certification for global markets.

Why IEC Certification Matters for BESS

IEC certifications ensure:

Safety: Protects people and infrastructure from battery-related risks like fire, explosion, and electric shock.
Performance: Verifies that the system delivers its rated capacity, efficiency, and lifespan.
Grid Compatibility: Confirms the system won’t disrupt power quality or stability.
Global Market Access: Required for entering many regulated markets in Europe, Asia, and the Americas.

Without proper IEC certification, your BESS project could face project delays, insurance issues, or legal penalties.

Key IEC Certifications for BESS

Here’s a list of the most important IEC standards applicable to BESS, from the cell level to the complete system level.

1. IEC 62619 – Safety of Secondary Lithium Cells and Batteries for Industrial Applications

Focuses on cell and battery safety for industrial use.
Covers thermal runaway, overcharging, short-circuit protection, and more.
Mandatory for Li-ion cells and packs used in BESS.

2. IEC 62933 Series – Electrical Energy Storage Systems (EESS)

IEC 62933 is the international framework governing grid energy storage systems (ESS). Developed by the International Electrotechnical Commission (IEC), it establishes requirements for design, safety, performance, and environmental impact. Its goal is to harmonize ESS deployment worldwide.

The standard applies to all types of storage technologies, including batteries, mechanical storage, and hybrid systems. By creating a unified baseline, IEC 62933 helps reduce risks and improve investor confidence in large-scale ESS projects.

Key Components of IEC 62933

IEC 62933 is not a single document but a family of standards. Each part focuses on a different aspect of energy storage:

IEC 62933-1: General guidance for grid energy storage system applications.
IEC 62933-2-1: Safety guidelines for electrochemical energy storage.
IEC TS 62933-2-2: Performance testing for batteries in grid storage.
IEC TS 62933-2-3: Guidance on environmental aspects and sustainability.
IEC TR 62933-2-201: Safety considerations for large-scale battery systems.
IEC 62933-4-2: Safety for pumped hydro, compressed air, and other mechanical storage.
IEC 62933-4-4: Environmental impact of large non-battery storage systems.
IEC 62933-5: Grid integration and operational aspects of energy storage.

This layered structure ensures that every storage technology has relevant safety and performance standards.

3. IEC 61508 – Functional Safety of Electrical/Electronic Systems

A core functional safety standard.
Essential when the BESS integrates with critical infrastructure or automation systems.
Helps determine Safety Integrity Levels (SIL).

4. IEC 62040 Series – Uninterruptible Power Systems (UPS)

Relevant if your BESS includes or interacts with UPS systems.
Covers performance, safety, and EMC compliance.

5. IEC 61000 Series – Electromagnetic Compatibility (EMC)

Ensures your BESS does not emit or fall victim to EM interference.
A must for grid-tied systems to maintain power quality and communication integrity.

6. IEC 61439-1 & IEC 61439-2 – Low Voltage Switchgear and Controlgear Assemblies

Applies to battery cabinets, switchboards, and power distribution components.
Critical for safe handling and switching of high-voltage DC and AC circuits in BESS.

7. IEC 62109-1 & 2 – Safety of Power Converters for Use in PV and ESS

Covers PCS (Power Conversion Systems) and inverters.
Ensures converters don’t pose electrical, thermal, or mechanical hazards.

8. IEC 60730 / IEC 60335 – Control Functions and Household BESS

For home energy storage systems, especially hybrid inverter-battery units.
Ensures user-level safety for residential installations.

Beyond Individual Components: System-Level Certification Is Crucial

It’s not enough to show cell or inverter certificates. An entire BESS system must be tested and certified as a whole.

Why?

Different brands/components interact differently.
Fire suppression, wiring, EMS logic, and enclosure design affect safety.
Authorities and insurers need proof that the assembled system works safely under real-world conditions.

If you’re buying or installing a BESS, ask for the full system IEC test reports, not just cell-level documents.

Regional Requirements Based on IEC

While IEC is international, many countries adopt and localize these standards:

Europe (CE): IEC standards are often harmonized with EN standards for CE marking.
India (BIS): BIS aligns many of its safety norms with IEC, especially for Li-ion storage.
China (GB Standards): Often derived from IEC benchmarks, though some are uniquely localized.
Australia & New Zealand: Follow AS/NZS standards largely based on IEC.
Middle East & Africa: Utilities require type-approved systems tested to IEC standards.

Documents to Request from Your Supplier

Before buying or installing a BESS, ask for:

IEC 62619 Cell & Pack Certification
IEC 62933 System-Level Safety Certificate
PCS/Inverter IEC 62109 Reports
BMS Compliance Documents
EMC Reports (IEC 61000 Series)
Type Test Report of Full Battery Rack or Container

If these are unavailable, it’s a red flag. You might be dealing with an uncertified, risky product.

Common Pitfalls to Avoid

Assuming cell certificates are enough
Using self-built systems without third-party testing
Mixing components without system-level integration testing
Skipping fire protection compliance

✅ Final Thoughts: IEC Certifications for BESS Is Not Optional

In the rapidly growing energy storage market, shortcuts are tempting—but dangerous. IEC certifications are not just documents; they’re your first line of defense against accidents, project rejections, and long-term failure.

So whether you’re developing a grid-scale BESS or installing a home backup system, insist on IEC-certified solutions. Your safety, investment, and reputation depend on it.

Got Questions About IEC Certifications for BESS?

As a New Energy Consultant, I help clients source, validate, and inspect certified energy storage systems across Asia. If you’re unsure about your battery supplier’s documents or want help with third-party testing, feel free to reach out.

BESS Certifications Explained: What You Need to Know Before You Buy or Sell

May 28, 2025/8 Comments/in Certification/by Rahul Jalthar

BESS Certifications: Battery Energy Storage Systems (BESS) are becoming a critical part of our renewable energy future. Whether you’re buying, selling, installing, or manufacturing BESS units, understanding the required certifications is crucial. Without proper certifications, your product may not be legally sold, safely operated, or even insured in many regions.

In this blog, we’ll break down the most important certifications for BESS and explain what they mean, why they matter, and how to ensure your system is compliant.

1. Why Are BESS Certifications Important?

Certifications are like a stamp of approval from trusted organizations. They prove that a BESS unit has passed safety, performance, and environmental tests. Without them:

You risk safety issues like fires or system failure.
Your product might be blocked from certain markets.
Insurance claims can be denied after accidents.
You might face legal problems or product recalls.

2. BESS Certifications Common Global Standards

Different countries and regions have different certification requirements. Here are some of the most common ones globally:

A. UL Standards (Mainly for North America)for BESS Certifications

UL (Underwriters Laboratories) is a leading safety organization in the U.S. These are some key UL standards for BESS:

UL 9540 – Safety for Energy Storage Systems and Equipment
UL 9540A – Thermal Runaway Fire Propagation Testing
UL 1973 – Batteries for Use in Stationary and Motive Applications
UL 1741 – Inverters, Converters, and Controllers for Use in Independent Power Systems

Why it matters: UL certifications are essential for selling in the U.S. and Canada. Without these, your product won’t be accepted in most residential or commercial projects.

B. IEC Standards (International) for BESS

The International Electrotechnical Commission (IEC) sets safety and performance standards recognized worldwide.

IEC 62619 – Safety for Secondary Lithium Cells and Batteries
IEC 62933 – Series of standards for energy storage systems
IEC 62133 – Safety for portable sealed secondary cells
IEC 61427 – Performance of batteries used in renewable energy systems

Why it matters: Many countries outside North America refer to IEC standards for regulatory compliance, especially in Europe, Asia, and the Middle East.

Learn how these standards are applied in real-world deployments in our dedicated article BESS Safety and Compliance.

C. CE Marking (Europe)

Products sold in the European Union must meet CE requirements. For BESS, this includes:

EMC (Electromagnetic Compatibility)
LVD (Low Voltage Directive)
RoHS (Restriction of Hazardous Substances)
Safety & Fire Protection

Why it matters: Without CE marking, you can’t legally sell your BESS product in the European Economic Area (EEA).

D. BIS (India)

In India, the Bureau of Indian Standards (BIS) regulates battery and BESS imports and production.

IS 16270 – For lithium-ion battery safety
IS 17855 – Latest standards aligning with international norms

Why it matters: India is a growing BESS market, and local certifications are mandatory for government tenders and utility-scale projects.

E. CEC (Australia)

The Clean Energy Council (CEC) governs renewable energy products in Australia.

Products must be on the CEC approved list
Certifications must include both product testing and installer compliance

Why it matters: BESS products not listed with the CEC are ineligible for rebates or connection to the grid.

3. Certification for the Entire System, Not Just the Cell

One major mistake people make is assuming that a certified cell means the entire battery system is certified. That’s not true.

A complete BESS includes:

Battery cells or packs
Battery Management System (BMS)
Power Conversion System (PCS)
Cooling systems, enclosures, cables, and connectors

Each component AND the fully assembled system must meet certification standards.

4. Factory-Level Certifications

Besides product certifications, the factory that makes your BESS should also be certified:

ISO 9001 – Quality Management
ISO 14001 – Environmental Management
ISO 45001 – Occupational Health & Safety
IATF 16949 – (If automotive-related BESS)

Why it matters: Certified factories reduce the risk of defects, improve traceability, and meet import regulations more smoothly.

5. Who Issues These Certifications?

UL – Underwriters Laboratories (USA)
TÜV – Germany-based, issues CE and IEC certifications
Intertek – Testing and certification services globally
SGS – Certification body with international presence
CSA – Canadian Standards Association

Always work with internationally recognized certification bodies for credibility and global market acceptance.

6. Red Flags to Watch Out For

Only cell report is shown – This is not enough! Ask for system-level reports.
No thermal runaway test (UL 9540A) – Risk of fire is very high without this.
Non-recognized lab – Some factories use fake or local-only reports.
Outdated reports – Certification validity matters. Check the dates.
No factory audit certificates – Poor factory management = higher product risk.

7. Tips for Buyers & Project Developers

Always request full certification reports, not just summaries.
Ask for the name of the lab and the full system test, not just component tests.
Make sure the certification is valid for the target market (UL for USA, CE for Europe, etc.)
Work with verified sourcing or consulting agents who understand the compliance rules.

Conclusion

BESS certifications are not just paperwork—they’re your protection against risk, rejection, and regulatory trouble. Whether you’re importing, installing, or investing in energy storage systems, certification is your first line of defense.

Make sure your BESS is properly tested, certified, and factory-audited to avoid future headaches. If you’re not sure, work with local experts who can help verify everything before the deal is done.

Need Help?

If you’re buying BESS from China or anywhere else, and you want to make sure the product is safe and certified, I can help. I do:

Factory checks
Certification report verification
BESS system inspections
Compliance guidance for your target market

Let’s make your BESS project safer, faster, and fully compliant.