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30.7kwh Large-Capacity Lithium Battery - Power Supply for Photovoltaic Grid-Connected Energy Storage Station. 10-Year Warranty: Comprehensive 10-year warranty coverage for peace of mind. 4000 Cycles Life: High durability with 4000 charge/discharge cycles. Multiple Certifications: CE, IEC62619, and UN38.3 certified for safety. Professional Support: 50 engineers provide 1-on-1 after-sales assistance. OEM/ODM Service: Custom manufacturing services available for bulk orders.