https://www.pytesess.com/Low-Voltage-Battery/Pi-LV1.html https://www.pytesess.com/industry/Stackable-energy-storage-system-Revolutionizing-residential-and-commercial-use.html Compact and easy installation, specially desiged for limited installation space. Expand the capacity of your backup power up to 30.72kWh max, as easy as stack a battery on one the other. IP65 rated for outdoor installation Compatible with all leading inverters PYTES self developed BMS, 10 years tested. Accurate & StableScalable & Sustainable 6000 Cycles @90% DOD>95% Round-trip efficiency Remote Firmware Upgrade 10 Year Warranty Delivery from Pytes warehouses located in California, Texas and Washington