Lithium iron phosphate battery 15.36kwh /48volts it holds a heavy loads like washing machine, cooking,water pump and other gadgets at home,it has 130kgs and it can give 15 units every night after charging,it's durable with 17yrs lifespan and 7yrs of warranty , battery capacity is 3000ah.its a new stock u shall not regret after having this system at yr business office/home