1.8KW Portable Outdoor Power Supply TP-MA1.8 Microstorage Series Product Features : · The industry's first dual cell boost solution with lower cost. · Plug and play, no installation. ·500W/1.8kWh long-term energy storage backup, suitable for areas with no electricity or frequent power outages. · Impressive lifespan up to 8000 cycles. https://www.topakpowertech.com/portable-energy-storage/1-8kw-portable-outdoor-power-supply