EG4 offers UL 9540 certified off-grid systems that are comparable in price to uncertified options—but with added safety, warranty assurance, and installer support. Featuring lithium-ion batteries, integrated thermal management, and smart BMS technology, these cabinets are perfect for grid-tied, off-grid, and microgrid applications. Backed by rigorous UL 9540 and UL 9540A testing, EG4's off-grid ESS brings certified fire safety, thermal protection, and real-world reliability into one accessible, scalable. This flexibility is designed to meet the diverse energy demands of households. All products are built with long-lasting LiFePO4, featuring over 6,500 cycles and at least 10 years of warranty. Our systems, certified to UL, IEC, CE, MSDS, UN38. Our modular systems can be paralleled to meet large-scale energy demands, providing reliable, resilient, and intelligent energy storage solutions tailored to any. Which best describes you? For more information on the processing of personal data, please see our Privacy Policy. I have read and agree to the Sungrow Terms of Use. We use a third party provider, MailChimp, to. ATESS energy storage systems are designed for a wide range of applications, suitable for small commercial use from 5kW to 50kW, as well as commercial and industrial use ranging from 30kW to MW scale. Our product offerings include hybrid inverters, battery inverters, battery solutions, solar charge.