IEC 62933: Global Standard for Grid Energy Storage Systems

IEC 62933: Global Standard for Grid Energy Storage Systems

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


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)

Worldwide Certification Guide for Power Conversion Systems (PCS)

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

StandardScopeWhy It Matters
IEC 62109-1 & 62109-2Safety of power converters for PV and ESSEnsures PCS meets operator and installer safety
IEC 62477-1Safety for power electronic convertersCovers high-power PCS in BESS
IEC 61000 SeriesEMC compliancePrevents harmful interference
ISO 9001:2015Quality managementEnsures consistent production quality
IEC CB SchemeMutual recognition of test resultsAvoids repeated testing for multiple markets

B. North America

StandardScopeNote
UL 1741 & UL 1741 SBInverters, converters, controllers for DERUL 1741 SB aligns with IEEE 1547-2018
IEEE 1547 & 1547.1Grid interconnectionMandatory for PCS grid connection
CSA C22.2Safety requirements for CanadaHarmonized with UL standards

C. Europe

StandardScopeNote
EN 50549-1 / -2Generating plant requirementsCovers PCS grid integration
EN 62477-1Safety for power electronicsRequired for high-voltage PCS
EN 61000EMC compliancePrevents interference
G99 (UK)Grid code complianceUK-specific requirement

D. Australia & New Zealand

StandardScopeNote
AS/NZS 4777.2Grid-connected inverter requirementsIncludes PCS
RCM MarkEMC & safetyRequired before market entry

E. South Africa

StandardScopeNote
NRS 097-2Grid connection rulesAddresses voltage, frequency, harmonics

F. China

StandardScopeNote
GB/T 34120 & GB/T 34133PCS safety & performanceRequired for ESS & PCS
GB/T 29319EMC standardsLocal testing required

G. India

StandardScopeNote
BIS IS 16221 & IS 16270PCS safetyMandatory BIS registration
CEA Grid CodeInterconnection rulesAdapted for Indian grid

H. Japan

StandardScopeNote
JIS C 8961 & C 8999PCS performance & safetyJapanese Industrial Standards
JET CertificationElectrical & performance safetyRequired for PCS sales
PPSA ComplianceGrid approvalUtility-specific process

I. South Korea

StandardScopeNote
KS C 8567 / KS C 8568PCS safety standardsKorean Standards
KC MarkEMC & safetyMandatory product mark
KEPIC / KERI TestingGrid complianceOverseen by KESCO

J. Southeast Asia

Thailand

StandardScopeNote
TISI CertificationPCS safetyThailand Industrial Standards Institute
MEA/PEA Grid CodeUtility approvalFor PCS connection to the grid

Singapore

StandardScopeNote
SPRING / Enterprise SGElectrical safetyNational compliance mark
EMA Grid ConnectionEnergy Market Authority approvalRequired for grid-tied PCS

Indonesia

StandardScopeNote
SNI CertificationIndonesian National StandardSafety & quality compliance
PLN Grid CodeUtility connection rulesApproval from PLN

K. Middle East

United Arab Emirates (UAE)

StandardScopeNote
ESMA CertificationSafety & EMCEmirates Authority
DEWA / ADWEA Grid CodeUtility complianceGrid-tied PCS requirement

Saudi Arabia

StandardScopeNote
SASO CertificationSafety & qualitySaudi Standards Org.
SEC Grid ConnectionUtility approvalSaudi Electricity Company rules

Qatar, Oman, Kuwait

  • Typically adopt IEC standards + local utility grid codes.

L. Latin America

CountryStandardNote
BrazilINMETRO + ONS Grid CodeSafety & grid compliance
ChileSEC Approval + Grid CodeEnergy regulatory approval
MexicoNOM + CFE Grid RulesSafety & 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

  1. Identify Target Markets
  2. Match Applicable Standards
  3. Pre-Test in Internal Lab
  4. Submit to Accredited Testing Body
  5. Receive Certificates
  6. 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

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

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

EU Regulations for 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.

StakeholderKey Compliance Actions
ManufacturersSubstance restrictions, CE marking, integrate Battery Passport, supply chain audits
ProducersJoin PROs, fund recycling & collection, manage EPR obligations
DevelopersAlign with EASE guidelines, secure CE & IEC certification, follow permitting rules
Utilities/OperatorsEnsure system transparency (SoC, SoH data), integrate grid codes, meet clean energy rules
InvestorsRequire 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:

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

Navigating the BIS Certification Process for Lithium-Ion Batteries in India

When it comes to lithium-ion batteries, safety and quality are non-negotiable. In India, the Bureau of Indian Standards , BIS certification is mandatory for lithium-ion battery cells and packs under the Compulsory Registration Scheme (CRS). If you’re an importer, manufacturer, or startup in the battery space, understanding the BIS process can make or break your market entry.

In this post, we’ll break down:

  • The step-by-step process to get BIS certification for lithium-ion batteries,
  • The key documents and testing procedures you’ll need,
  • Expected timelines, and
  • The benefits of getting certified.

What is BIS Certification and Why Does It Matter?

BIS certification ensures that products meet Indian safety and quality standards. For lithium-ion batteries, this means compliance with IS 16046 (Part 1 & 2): 2018, which aligns with IEC 62133 standards for rechargeable battery cells and packs.

Without BIS certification:

  • Your products can’t be legally sold in India.
  • Non-compliance can result in heavy penalties, confiscation, or legal action.
  • Retailers and end-users won’t trust your brand.

In short, Bureau of Indian Standards certification is your license to operate and compete legally and credibly in the Indian market.


Step-By-Step Process for Obtaining BIS Certification

Let’s break down the process into actionable steps:


Step 1: Understand Applicable Standards — The Foundation for BIS Success

Before you even think about testing or submitting paperwork, you must understand which BIS standard applies to your lithium-ion battery product. This is the most crucial first step — and surprisingly, it’s where many manufacturers and importers trip up.


Why Standards Matter

The BIS (Bureau of Indian Standards) doesn’t just issue random approvals. It certifies that your product conforms to a specific Indian Standard (IS), which defines the safety, performance, and reliability criteria it must meet.

For lithium-ion batteries, the key standard is:

  • IS 16046: Part 1 & Part 2 (2018), which is harmonized with IEC 62133, the international benchmark for secondary cells and batteries containing alkaline or other non-acid electrolytes.

What Exactly Does IS 16046 Cover?

Here’s the breakdown:

  • IS 16046 (Part 1): 2018Secondary cells and batteries containing alkaline or other non-acid electrolytes – Safety requirements for portable sealed secondary cells, and for batteries made from them, for use in portable applications.
    Use this for certifying lithium-ion cells.
  • IS 16046 (Part 2): 2018Safety requirements for lithium-ion battery packs assembled using certified cells.
    Use this for certifying battery packs or modules.

Real-World Example

If you import or make 18650 or 21700 cylindrical cells, you certify the cells under IS 16046 Part 1.
✅ If you assemble these cells into a battery pack (say, for an electric scooter or energy storage system), you must certify the battery pack under IS 16046 Part 2, even if the cells are already BIS-certified.

Key Point:
👉 Certifying cells doesn’t automatically cover the pack — each level needs separate testing and registration.


Don’t Confuse Battery Types

Not all lithium-ion chemistries are covered under the same scope. The standard generally covers:

However, lithium metal primary batteries (like button cells) or unusual chemistries may have different or additional requirements.


Why This Step is Crucial

📌 If you choose the wrong standard, your testing lab may run incorrect tests, leading to test failures, wasted costs, and application rejections.

📌 Customs clearance can also be a nightmare if your product’s Standard Mark doesn’t align with the correct standard.

📌 You’ll be better prepared to explain your product in detail to BIS inspectors and labs — and avoid embarrassing or costly missteps.


Quick Checklist for Step 1

✔️ Identify your product: Is it a cell, module, or pack?
✔️ Match it to the right standard (IS 16046 Part 1 or Part 2).
✔️ Read the standard (or get expert help) to know the tests and safety requirements.
✔️ Make sure your product design, materials, and manufacturing processes align with the standard BEFORE sending samples for testing.


🔍 Pro Tip

If you’re unsure, consult a BIS-approved testing laboratory or an experienced local certification consultant. A small upfront investment here can save you months of delays and thousands in retesting costs.


Step 2: Appoint an Authorized Indian Representative (AIR)

If you’re an overseas manufacturer, you must appoint an Authorized Indian Representative to liaise with BIS on your behalf.

Why it’s important: Without an AIR, foreign brands can’t apply for registration. The AIR is your local bridge for communication, document submission, and compliance.


Step 3: Prepare Required Documents

The BIS process is documentation-heavy. Typical documents include:

📌 Application form (Form VI under CRS)
📌 Manufacturing license and factory registration proof
📌 Authorized Indian Representative (AIR) nomination letter
📌 Product datasheets and circuit diagrams
📌 Factory layout and process flow chart
📌 Quality control plan and test reports (if any prior)
📌 Trademark registration certificate (if using a brand name)
📌 Undertaking and declaration forms

Why it’s important: Missing or inaccurate documents are the #1 reason for application rejections.


Step 4: Product Sample Testing

Products must be tested at BIS-recognized labs in India. Here’s what happens:

1️⃣ Send your samples to the BIS-approved lab.
2️⃣ The lab conducts safety, performance, and quality tests as per IS 16046 standards.
3️⃣ The lab issues a test report valid for 90 days.

Common tests include:

  • Electrical tests (overcharge, over-discharge, short circuit)
  • Mechanical tests (vibration, impact)
  • Thermal tests
  • External short circuit and forced discharge tests

Why it’s important: Tests validate that your batteries won’t fail in real-life conditions. This is crucial for EVs, consumer electronics, and energy storage.


Step 5: File the Online Application

Once you have the test reports, file your online application through the BIS portal. Attach all documents, including the test report.

Pay the application and registration fee online.

Why it’s important: Delays at this stage add weeks to your timeline if the submission is incomplete or incorrect.


Step 6: BIS Assessment & Grant of License

BIS officers review your application. If they find gaps, they may request clarifications or additional documents.

If everything is in order:
✅ The BIS issues a Registration Certificate (RC).
✅ The RC is valid for 2 years and must be renewed before expiry.

Why it’s important: Only after you get the RC can you legally affix the BIS Standard Mark on your battery cells or packs.


Typical Timelines for BIS Certification

Here’s a rough timeline:

  • Document Preparation: 1–2 weeks
  • Sample Testing: 3–5 weeks
  • Application Review: 2–3 weeks
  • Total Time: 6–10 weeks (if all goes well!)

Delays often happen due to:

  • Missing documents
  • Test failures
  • Non-compliance with IS standards
  • High lab workloads

Benefits of BIS Certification for Lithium-Ion Batteries

Let’s not forget why this process is worth it:

Ensures Product Safety: Prevents overheating, fires, or explosions—protects end-users and your brand.

Builds Consumer Confidence: BIS-marked products are trusted by distributors and buyers. It shows your batteries meet India’s strictest standards.

Legal Compliance: Avoids penalties, seizures, or customs rejections.

Market Competitiveness: BIS certification is a market differentiator. Buyers prefer certified suppliers.

Unlocks Partnerships: Many B2B clients and government tenders mandate BIS-certified products.


Pro Tips for a Smooth BIS Process

✔️ Partner with an experienced local consultant or lab.
✔️ Plan extra samples—tests can damage units.
✔️ Keep your documents updated.
✔️ Stay on top of BIS amendments. Standards may change!
✔️ Never skip quality control. BIS can conduct factory audits.


Final Thoughts

Navigating the BIS certification process for lithium-ion batteries in India may feel daunting, but the payoff is clear: safer products, legal compliance, and a competitive edge in one of the world’s fastest-growing battery markets.

If you’re ready to get Bureau of Indian Standards certified, don’t cut corners. Prepare thoroughly, test diligently, and partner with trusted experts who understand the local regulatory landscape.

IEC Certifications for BESS

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

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: Global Standard for Grid Energy Storage Systems

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.

Read More about IEC 62933 Series 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


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:

  1. IEC 62619 Cell & Pack Certification
  2. IEC 62933 System-Level Safety Certificate
  3. PCS/Inverter IEC 62109 Reports
  4. BMS Compliance Documents
  5. EMC Reports (IEC 61000 Series)
  6. 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 Guide

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

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:

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.


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.

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.

EU Batteries Regulation (EU 2023/1542)

EU Batteries Regulation (EU 2023/1542): A Complete Guide

The EU Batteries Regulation (EU 2023/1542), adopted in July 2023, is a game-changing law that sets strict rules for how batteries are designed, manufactured, labeled, used, and recycled. Unlike the previous directive, this regulation applies directly across all EU member states, creating a unified framework. It replaces the outdated Battery Directive 2006/66/EC and aligns with the European Green Deal and Circular Economy Action Plan.


1. Scope and Timeline of EU Batteries Regulation (EU 2023/1542)

This regulation applies to almost all types of batteries, including:

  • Portable batteries in electronics and appliances
  • Industrial batteries used in storage systems
  • Automotive batteries
  • Electric vehicle (EV) batteries
  • Light means of transport (LMT) batteries, such as e-bikes and e-scooters
Time Line for EU Batteries Regulation (EU 2023/1542)

Key deadlines to note:

👉 Related reading: Timeline of EU Battery Regulations Implementation


2. Main Objectives of the EU Batteries Regulation (EU 2023/1542)

The regulation is designed to:

  • Ensure sustainable battery production and reduce environmental impact
  • Improve safety, transparency, and compliance
  • Support resource recovery and battery recycling targets
  • Give consumers clear information on carbon footprint and performance
  • Establish the EU as a global leader in green battery standards

3. Core Provisions of EU Batteries Regulation (EU 2023/1542)

a) Sustainability & Hazardous Substances

The regulation sets strict limits on heavy metals:

  • Mercury ≤ 0.0005%
  • Cadmium ≤ 0.002%
  • Lead ≤ 0.01% (exceptions apply until 2028)

These limits reduce toxic waste and push producers toward eco-friendly battery chemistry.


b) Carbon Footprint & Labelling

From 2024, manufacturers must include:

  • Carbon footprint declarations based on EU methodology
  • CE marking and hazard icons
  • Identification of battery type and chemical composition

By 2026, labels must also state capacity, lifespan, and proper disposal methods.


c) Digital Battery Passport (2027 Onwards)

One of the most innovative elements is the digital battery passport.

  • Applies to EV, LMT, and industrial batteries above 2 kWh
  • Accessible via QR code
  • Contains data on raw materials, lifecycle, recycling, and performance

This tool will increase traceability, reuse, and recycling efficiency.


d) Extended Producer Responsibility (EPR)

Producers must take back used batteries and ensure proper recycling.

  • Collection targets: 63% for portable batteries by 2027, rising further by 2030
  • Recycling efficiency goals:
    • Lithium: 50% by 2027, 80% by 2031
    • Cobalt, nickel, copper, lead: 90% by 2027, 95% by 2031

e) Removability & Repair Obligations

  • By 2027, portable device batteries must be easily removable by consumers.
  • LMT batteries must be replaceable by independent professionals.
    This ensures longer product lifespans and supports the right to repair movement.

f) Supply Chain Due Diligence

Battery manufacturers must assess and address environmental and social risks, especially concerning critical raw materials like lithium, cobalt, and nickel.


g) Enforcement & Penalties

EU member states must set effective and dissuasive penalties for non-compliance by 2025. Companies failing to meet obligations risk heavy fines and restricted market access.


4. Why the EU Batteries Regulation Matters

The EU Batteries Regulation 2023/1542 is a turning point for the industry:

  • It creates a circular economy for batteries
  • Pushes innovation in recycling and green chemistry
  • Protects consumers with clear labels and sustainability standards
  • Forces global suppliers to comply if they want access to the EU market

👉 You may also like: New EU End-of-Life Battery Regulations Create Legal and Commercial Complexities


Conclusion

The EU Batteries Regulation (EU 2023/1542) is more than just another piece of legislation. It sets the foundation for a sustainable battery market, from design and labeling to recycling and reuse. For businesses, early compliance is not optional—it’s the only way to remain competitive in Europe’s fast-changing energy landscape.


UL 1973 Certification for Battery Systems

UL 1973 Certification: The Safety Standard for Modern Battery Systems

As energy storage technologies power everything from homes to large-scale grids, safety and compliance have become non-negotiable. Among the most important safety benchmarks is UL 1973 certification, the globally recognized standard for stationary batteries and energy storage systems.

This certification validates that a battery has passed rigorous safety and performance tests, ensuring it can operate reliably under real-world conditions. For manufacturers, system integrators, and project developers, achieving UL 1973 certification is not only about compliance—it is about protecting customers, enabling market access, and building trust.


What Is UL 1973 Certification?

UL 1973, formally titled “Batteries for Use in Stationary, Vehicle Auxiliary Power, and Light Electric Rail Applications,” defines the testing requirements for rechargeable batteries used in non-automotive settings.

In simpler terms, if you are producing a Battery Energy Storage System (BESS) or a stationary backup solution, UL 1973 is the certification you need to prove safety.

The standard covers:

  • Electrical safety (short-circuit, overcharge, abnormal charging)
  • Mechanical safety (vibration, shock, impact resistance)
  • Thermal safety (temperature cycling, fire resistance, thermal runaway prevention)
  • Environmental durability (humidity, corrosion, altitude testing)

👉 Related Reading: Difference Between BESS and ESS


Why UL 1973 Matters for Battery Manufacturers and Integrators

Battery failures are not just technical risks—they carry financial, legal, and reputational consequences. By obtaining UL 1973 certification:

  • Market Access: Many regions, including North America, require UL compliance before commercialization.
  • Customer Confidence: Certified systems are trusted more by utilities, C&I customers, and regulators.
  • Reduced Liability: Certification demonstrates due diligence in meeting safety requirements.
  • Integration with Other Standards: UL 1973 certification is often a prerequisite or complement to UL 9540 for full energy storage system compliance.

👉 Learn More: UL 9540 vs. UL 9540A: What’s the Difference?


Key Tests in UL 1973 Certification

To achieve certification, batteries undergo a wide range of evaluations. Some of the most critical include:

UL 1973 Certification Key Safety tests for battery System

1. Electrical Abuse Tests

  • Overcharge / Over-discharge – Verifies how cells handle extreme electrical conditions.
  • Short-circuit resistance – Ensures protective circuits prevent hazards.

2. Mechanical Tests

  • Vibration and shock testing – Simulates transportation and installation stresses.
  • Impact resistance – Evaluates casing and module integrity.

3. Thermal & Fire Safety

  • Thermal cycling – Repeated heating and cooling to test durability.
  • Flame resistance – Verifies the system’s ability to resist ignition.
  • Thermal runaway testing – Ensures proper containment under failure.

4. Environmental Tests

  • Altitude testing – For high-elevation installations.
  • Humidity and corrosion tests – Verifies performance in harsh climates.

👉 Related Reading: IEC Certifications for BESS


UL 1973 vs. Other Battery Standards

Many companies confuse UL 1973 with other standards. Here’s how it fits into the bigger picture:

Battery Safety Standards Compared with UL 1973 Certification
StandardScopeApplicationRelationship
UL 1973Stationary & rail batteriesCell & module levelFoundation safety testing
UL 9540Energy storage systemsSystem-level BESSRequires UL 1973-certified components
UL 9540AFire safety testingPropagation & thermal runawayComplements UL 1973
IEC 62619International battery safetyGlobal marketsOften paired with UL for dual compliance

👉 See Our Guide: UL 9540 Certification Explained


Challenges in Obtaining UL 1973

While certification is essential, the path can be complex. Common challenges include:

  • Long testing timelines (6–12 months depending on lab capacity)
  • High costs for prototype testing and certification cycles
  • Design changes triggered by failures in early testing
  • Documentation requirements (schematics, safety analysis, BMS reports)

Sunlith Energy helps clients streamline compliance by aligning battery designs with UL requirements early in the product development cycle.


How Sunlith Energy Supports UL 1973 Certification

At Sunlith Energy, we don’t just deliver battery solutions—we ensure they are market-ready and compliant. Our support includes:

  • Design consulting – Ensuring your battery pack meets UL 1973 requirements from the ground up.
  • Pre-certification testing – Identifying weak points before official lab submission.
  • Documentation support – Preparing technical files, test reports, and safety manuals.
  • Partnership with certified labs – Speeding up the testing and approval process.

👉 Contact Us: Sunlith Energy


FAQs: UL 1973 Certification

Q1. What is UL 1973 certification?

It is a safety certification for stationary and rail-use rechargeable batteries that validates performance under electrical, mechanical, and thermal stress.

Q2. Is UL 1973 mandatory for all batteries?

No, it applies primarily to stationary and auxiliary power systems, not automotive traction batteries (those follow UL 2580).

Q3. How long does certification take?

Typically 6–12 months, depending on battery complexity and lab availability.

Q4. How does UL 1973 relate to UL 9540?

UL 1973 ensures the safety of the battery itself, while UL 9540 covers the entire storage system. Most UL 9540 certifications require UL 1973-approved components.

Q


Final Thoughts

In the competitive energy storage landscape, UL 1973 certification is more than just a box to check—it is your gateway to trust, compliance, and market success. Whether you’re developing a new stationary storage solution or scaling up production, aligning with this standard protects your customers, your business, and your brand.

At Sunlith Energy, we combine technical expertise with compliance experience to help you achieve certification faster and more cost-effectively.

👉 Ready to take your battery system to the next level? Talk to Sunlith Energy today.