About the warranty of energy storage batteries

1. Battery warranty: What does it cover?

Battery energy storage system (BESS) warranties typically cover the following:

Performance warranty: Ensures that the battery maintains a specific capacity level for a period of time (e.g., 70-80% of its original capacity after 10 years or a certain number of cycles, such as 6,000 cycles).

Manufacturing defects: Covers issues related to defective materials or workmanship, including defects in battery cells, casings, and internal components.

Service and replacement: Some warranties include free repair or replacement of defective units during the warranty period.

Depth of discharge (DOD) limits: Many warranties specify recommended discharge levels to preserve battery life, usually around 80-90% DOD.

2. How to ensure your supplier's warranty is reliable?

To avoid dealing with unreliable suppliers, consider the following:

Check the supplier's reputation: Check reviews, case studies, and customer testimonials. Well-known brands with a history of reliable service are more trustworthy.

Warranty terms and conditions: Read the fine print to make sure there are no hidden clauses that would void the warranty due to normal use conditions.

Supplier’s financial stability: Companies that have been in business for many years are less likely to disappear or default on warranty obligations.

Third-party certifications: Make sure the product meets international safety and quality certifications such as UL, CE, IEC or TÜV.

Local service support: Reliable suppliers have local service centers or partners that can provide fast maintenance and replacement services.

3. Common damaged components in energy storage batteries

Although modern lithium batteries are durable, some components are more susceptible to damage:

Battery Management System (BMS): The BMS is essential for monitoring voltage, temperature and charging cycles. Overvoltage, overheating or software glitches can all lead to failure.

Individual battery cells: Due to uneven charge/discharge cycles, some battery cells may degrade faster than others, resulting in capacity loss and performance degradation.

Cooling system: For high-capacity energy storage systems, improper cooling can lead to overheating, shortened service life and reduced efficiency.

Connectors and Wiring: Poor quality or loose electrical connections can lead to high resistance, overheating, and potential safety risks.

4. Why Choose SUNESS?

At SUNESS, we prioritize reliability and customer satisfaction with strong warranty coverage:

Comprehensive 10-year warranty: We guarantee to repair or replace energy storage batteries within 10 years, provided there is no intentional damage or unauthorized disassembly by the customer.

High-quality components: Our batteries use Grade A LiFePO4 cells and advanced BMS technology to ensure longevity and safety.

Global support network: We have service centers and professional support teams around the world to provide timely maintenance and replacement services.

Transparent warranty policy: No hidden terms - our warranty terms are clear and fair to ensure customer peace of mind.

When choosing an energy storage system, ensuring a reliable warranty is as important as the battery itself. By choosing a trusted supplier like SUNESS, you can ensure long-term performance and protect your investment.