100Kwh-runny-24x7-solar and BESS calculations
Rahul Jalthar

How to Choose Solar Panels and Batteries to Run a 100kWh Load 24/7: Full Guide with Examples

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If you’re planning to power a 100kWh load continuously (24/7) using solar panels and a battery energy storage system (BESS), it’s not as simple as just multiplying watts. You need to factor in weather conditions, seasonal sunlight availability, cloudy days, and energy efficiency. This blog will guide you step-by-step on how to size your system properly using formulas, examples, and visual data.

📌 What You’ll Learn:

  • How to calculate required solar panel capacity
  • Why yearly weather data is critical
  • How to handle cloudy days and winter months
  • Battery sizing for different backup durations
  • Example formulas and real-world values

🔧 Step 1: Understand Your Load

Let’s say your system must support a 100 kWh per hour load.

  • 24 hours/day × 100 kWh = 2,400 kWh per day
  • That’s your daily energy demand from solar + battery.

🌍 Step 2: Analyze Your Location’s Solar Irradiance

Your geographic location heavily influences how much sunlight you receive—measured in Peak Sun Hours (PSH).

LocationPeak Sun Hours
Phoenix, USA6.5 PSH
New Delhi, India5.5 PSH
London, UK2.8 PSH

👉 You can get this data from tools like PVWatts, NASA SSE, or Solcast.

🧮 Step 3: Calculate Required Solar Panel Capacity

Formula:

textCopyEditRequired Solar Capacity (kW) = Daily Load (kWh) ÷ (PSH × Derating Factor)
  • Daily Load = 2,400 kWh
  • Derating factor (system losses) = ~0.8
SeasonPSHRequired Solar Capacity
Summer6.52,400 ÷ (6.5 × 0.8) ≈ 462 kW
Winter4.02,400 ÷ (4.0 × 0.8) ≈ 750 kW
Cloudy Days2.52,400 ÷ (2.5 × 0.8) ≈ 1,200 kW
Solar panels required for 100KWh running 24/7


🌥️ Why Consider Cloudy Days?

Even if your area has high annual irradiance, you’ll still face days with poor sun exposure. For mission-critical applications, your system must:

  • Be oversized for worst-case scenarios.
  • Include battery backup for 1–3 days.
  • Use hybrid systems (e.g., gensets or grid backup) if needed.

❄️ Considerations for Winter Months

Winter brings:

  • Lower sun angles
  • Shorter daylight
  • Snow cover (for northern regions)

???? This reduces effective PSH and increases your dependence on storage or supplemental power.

⚡ Step 4: Size the BatteryEnergy Storage System for Backup

Battery Energy Storage System should store enough energy to power the load during non-sunny hours or failures.

Formula:

textCopyEditBattery Capacity (kWh) = (Daily Load × Days of Autonomy) ÷ (DoD × Efficiency)
  • Daily Load = 2,400 kWh
  • Depth of Discharge (DoD) = 0.8
  • Round-trip Efficiency = 0.9
Backup DurationRequired Battery Capacity
1 Day2,400 ÷ (0.8 × 0.9) ≈ 3,333 kWh
2 Days4,800 ÷ (0.8 × 0.9) ≈ 6,667 kWh
3 Days7,200 ÷ (0.8 × 0.9) ≈ 10,000 kWh
Battery Backup required for 100Wh 24/7 Running


✅ Tips for Choosing Solar Panels

  • ✔️ Use Tier-1 panels with high efficiency (≥21%)
  • ✔️ Consider bifacial panels if space allows
  • ✔️ Use anti-reflective coating for dust-heavy areas
  • ✔️ Install with adjustable tilt for seasonal optimization

✅ Tips for Choosing Batteries Cells for BESS

🔄 Hybrid Solutions for Reliability

When powering a 100kWh continuous load, consider a hybrid setup:

  • ???? Solar + Battery + Diesel: For industrial backup
  • ???? Solar + Grid + Battery: For grid-tied systems
  • ????️ Solar + Wind + Battery: For off-grid redundancy

📊 Real Use Case Example

Scenario:

  • Location: Northern India
  • PSH (winter): 4 hours
  • Load: 100kWh × 24 = 2,400kWh/day
  • Solar Size = 2,400 ÷ (4.0 × 0.8) = 750 kW
  • Battery for 2 days = 2,400 × 2 ÷ (0.8 × 0.9) ≈ 6,667 kWh

🧠 FAQs

Q: Can I go without batteries?

A: Only if your load is flexible or you remain connected to the grid.

Q: Should I oversize the battery or the solar array?

A: Both, depending on your climate. Cloudy regions need higher solar oversizing.

Q: What’s better—LFP or NMC batteries?

A: LFP is safer and more stable for stationary storage.

📌 Conclusion

Designing a solar + battery system for a 100kWh 24/7 load isn’t just about matching numbers—it’s about planning for the worst day of the year, not the best. Location-specific solar data, battery autonomy, system losses, and seasonal variations must all be part of your sizing strategy.

Sodium-Ion Battery Safety: Why Sodium-Ion Is Safer Than Lithium-Ion
Rahul Jalthar

How Safe Are Sodium-Ion Batteries? Key Safety Advantages Explained

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Why Sodium-Ion Battery Safety Matters for Businesses

When companies invest in energy storage, safety is often the top priority. Incidents with lithium-ion batteries—fires, thermal runaway, and compliance hurdles—have pushed businesses to seek safer alternatives. This is where sodium-ion battery safety stands out.

Sodium-ion batteries are designed with superior thermal stability, reduced fire risks, and simpler compliance pathways compared to lithium-ion. For businesses navigating strict safety certifications and EU regulations, sodium-ion offers a lower-risk, future-ready solution.

👉 Related Reading: Sodium-Ion vs. Lithium-Ion: Which is the Future of Energy Storage?

Why Sodium-Ion Battery Safety Is a Business Advantage

Businesses evaluating energy storage must look beyond performance and cost. Sodium-ion battery safety impacts:

  • Insurance premiums (lower with reduced fire risk).
  • Regulatory compliance (simpler with safer chemistry).
  • Operational reliability (less downtime from incidents).
  • Reputation (trusted systems protect brand image).

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

Thermal Stability: The Core of Sodium-Ion Battery Safety

Unlike lithium-ion, which can enter thermal runaway under stress, sodium-ion battery safety benefits from natural thermal stability.

  • Operates safely at higher temperatures.
  • Less prone to overheating in hot climates.
  • Reliable for indoor storage systems with limited cooling.

👉 Related Reading: Top 5 Advantages of Sodium-Ion Batteries for Energy Storage Systems

Reduced Fire Risk

Lithium-ion incidents often stem from internal short circuits, overcharging, or dendrite formation. Sodium-ion’s chemistry avoids many of these risks.

  • Uses safer electrolytes that are less flammable.
  • Reduced chance of catastrophic failure.
  • Lower insurance and safety management costs.

This makes sodium-ion battery safety especially attractive for residential, commercial, and industrial BESS.

Compliance and Certification Advantages

Meeting UL, IEC, and CE standards is a challenge with lithium-ion. Sodium-ion simplifies this process.

👉 Related Reading: Different Types of IEC Standards for C&I BESS – And How Some Companies Misuse Certificates

Real-World Use Cases

  • Homes & Apartments: Safe for garages and indoor ESS.
  • Commercial Buildings: Schools, hospitals, and offices benefit from safer storage.
  • Industrial & Utility-Scale: Lower risk of catastrophic failures in large installations.

In all these scenarios, sodium-ion battery safety lowers risk exposure while enabling smoother compliance.

Sodium-Ion vs. Lithium-Ion Safety: A Clear Comparison

Sodium-Ion Battery Safety: Why Sodium-Ion Is Safer Than Lithium-Ion
FeatureLithium-IonSodium-Ion
Thermal RunawayHigh RiskVery Low Risk
Fire HazardFrequentMinimal
Certification ComplexityHighLower
Indoor UseLimitedSafer

Bottom line: Sodium-ion battery safety is a decisive advantage in regulated industries.

Conclusion: Sodium-Ion Battery Safety as a Market Driver

As businesses adopt cleaner energy storage solutions, sodium-ion battery safety is a critical reason for the shift.

  • More thermally stable than lithium-ion.
  • Lower fire risks for homes, businesses, and utilities.
  • Easier compliance with UL, IEC, and EU regulations.

At SunLith Energy, we believe sodium-ion represents the future of safe, scalable energy storage. By prioritizing sodium-ion battery safety, businesses can reduce risks, protect their brand, and stay ahead of global compliance standards.

Sunlith
Rahul Jalthar

SunLith: The Name, The Vision, The Power Behind It

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🌞 The Name SunLith Has a Heartbeat

Sunlith: Every great idea starts with a question.
When we started this journey, ours was simple:
“How can we help the world move toward clean, reliable, and smart energy?”

That question led to a name: SunLith.
Two short syllables—but packed with deep meaning, bold purpose, and big dreams.

🔋 What Does SunLith Mean?

It’s simple:

  • Sun – The most powerful, natural, and endless source of energy known to us.
  • Lith – Short for Lithium, the core material in modern battery technology.

Together, SunLith means blending the power of nature with the brilliance of human innovation.

It’s not just a name.
It’s a vision of a world where energy is clean, storage is smart, and the future is bright.

💡 Why the Name Matters

We didn’t want a generic name. We wanted something real.
Something that speaks to who we are, what we do, and why it matters.

SunLith reminds us every day:

  • To stay connected to the Earth and its natural power.
  • To stay committed to clean technology and better battery systems.
  • To stay focused on building a sustainable world for the next generation.

If you care about a greener, smarter, and more stable energy future,
then the name SunLith belongs to you too.

Frequently Asked Questions (FAQs)

Q1: What does the name “SunLith” mean?

A: SunLith is a combination of “Sun”, representing natural solar energy, and “Lith”, derived from lithium, the element at the heart of modern energy storage. It reflects our mission to merge sustainable energy generation with advanced battery technology.

Q2: Is SunLith only focused on solar energy solutions?

A: Not at all. While solar power inspires our name, SunLith provides a full range of energy solutions—including EV batteries, energy storage systems (ESS), lithium-based power packs, and hybrid microgrids for home, commercial, and industrial use.

Q3: What makes SunLith different from other energy companies?

A: SunLith stands out because we combine cutting-edge lithium technology with a strong commitment to sustainability. We offer customized, smart, and reliable energy systems that go beyond the ordinary—built to perform, last, and protect the environment.

Q4: Does SunLith manufacture its own cells?

A: SunLith partners with top-tier certified manufacturers and performs rigorous quality checks, factory audits, and FAT/QC inspections to ensure every product we deliver meets international standards and client expectations.

Q5: Who are SunLith’s typical clients?

A: We serve B2B clients in the new energy sector, including project developers, EPC contractors, system integrators, and distributors who need energy storage solutions for EV, home, C&I, and utility-scale applications.

Q6: Where is SunLith based?

A: SunLith operates out of Shenzhen, China, with strong ties to leading Chinese battery manufacturers and global markets. We also work closely with clients in India, Southeast Asia, the Middle East, and Europe.

Q7: What is SunLith’s long-term vision?

A: Our vision is to create a cleaner, smarter energy future—where renewable sources are efficiently stored and distributed using intelligent, scalable systems. We aim to be a trusted global name in energy storage solutions.

Q8: Can SunLith help with sourcing and procurement?

A: Yes! SunLith doesn’t just sell products—we act as your buying agent, helping with sourcing, supplier verification, price negotiation, logistics coordination, and end-to-end project support for energy solutions.

Q9: How does SunLith ensure product quality and compliance?

A: We conduct detailed factory audits, verify certifications and test reports, and ensure each system complies with international standards like UN38.3, IEC62619, CE, UL, BIS, and more.

Q10: Is SunLith a good partner for new energy startups or projects?

A: Absolutely. Whether you’re a startup or a large EPC, we provide expert consulting, reliable sourcing, and high-performance energy solutions that give you a competitive edge in the fast-growing green energy space.

🌍 Why We Believe in SunLith

At the end of the day, energy isn’t just about power.
It’s about people.
It’s about the planet.
It’s about the promise of a better tomorrow.

That’s why we named our company SunLith.
Because we believe the future is bright, clean, and within reach.

The Future Is Bright

The name SunLith is more than a label—it’s a guiding light. It’s a declaration that we are powered by nature and enhanced by technology. It’s a daily reminder of why we exist and who we serve.

If you believe in a cleaner, smarter, and stronger energy future, you believe in SunLith.

difference between BESS and ESS
Rahul Jalthar

🔋 What’s the Real Difference Between BESS and ESS?

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What Is the Difference Between BESS and ESS?

When talking about renewable energy and power storage, the difference between BESS and ESS often confuses beginners. These two terms might seem similar, but they’re not the same. Understanding what each means is important if you’re dealing with solar systems, energy projects, or even electric vehicles.

Let’s break it down in simple words.

What Does ESS Mean?

ESS stands for Energy Storage System. It refers to any system that stores energy, not just electricity. This includes a wide range of technologies used to store energy in different forms — chemical, mechanical, thermal, or electrical.

Common Types of ESS:

In short, ESS is a general term for any system that can hold and release energy when needed.

What Is BESS?

BESS stands for Battery Energy Storage System. It is a type of ESS that stores electrical energy using batteries. BESS has become the most popular energy storage solution, especially with solar and wind projects.

A Typical BESS Includes:

The difference between BESS and ESS is that BESS is battery-specific, while ESS can refer to many other types of storage.

Why Is the Difference Between BESS and ESS Important?

Knowing the difference between BESS and ESS helps you:

✅ Choose the right technology
✅ Communicate clearly with vendors or partners
✅ Understand costs, installation, and maintenance needs
✅ Plan projects efficiently

If you are discussing a specific battery solution, say “BESS.”
If you are referring to general energy storage options, use “ESS.”

Common Questions About BESS vs ESS

❓ Is Every BESS Also an ESS?

Yes. Every Battery Energy Storage System (BESS) is a type of Energy Storage System (ESS). But not every ESS is a BESS. Some ESS use water, air, or heat instead of batteries.

❓ Which One Should I Choose for My Project?

If you are storing electricity from solar panels or wind turbines, BESS is usually the best option. It’s compact, scalable, and fast-responding. If you are looking at long-term or large-scale energy storage, you might consider other ESS types like pumped hydro.

❓ Why Do People Use ESS Instead of Just Saying BESS?

Because ESS includes all types of storage, it’s often used in broad industry discussions. For example, when governments talk about energy policy or infrastructure planning, they use “ESS” to include all possibilities.

Real-World Example to Understand the Difference Between BESS and ESS

Imagine you’re building a smart home that uses solar panels.

  • If you add a battery system to store extra solar power for night-time use, you’re installing a BESS.
  • If your neighbor uses a water tank that powers a small turbine when needed, that’s also an ESS — but not a BESS.

Both are energy storage systems, but they’re powered differently.

Where You Will Hear “BESS” the Most

You’ll often hear “BESS” used in:

  • 🏭 Industrial energy storage projects
  • ☀️ Solar & wind power plants
  • 🏘️ Residential solar systems with battery backup
  • 🚗 EV charging stations
  • ⚡ Grid stabilization systems

That’s because battery storage is now the fastest-growing part of the ESS world.

Summary: The Key Difference Between BESS and ESS

TermFull FormWhat It DoesStorage Type
ESSEnergy Storage SystemStores energy (any form)Batteries, water, air, heat, etc.
BESSBattery Energy Storage SystemStores electrical energyOnly batteries (like lithium-ion)

In short:
BESS is a type of ESS that uses batteries. ESS can include many other technologies.

Final Thoughts: BESS or ESS — Which One Is Right for You?

Understanding the difference between BESS and ESS is not just about knowing the terms — it’s about making better choices for your energy systems.

  • Use ESS when discussing all storage technologies.
  • Use BESS when you’re focused on battery-based energy storage.

👉 If you’re installing a battery backup, optimizing solar storage, or building a smart energy solution — you’re working with a BESS.

👉 If you’re exploring large infrastructure or hybrid solutions — you’re likely considering multiple ESS options.

In today’s energy-driven world, knowledge leads to smarter and safer decisions.