This is su-kam 2.5kva -48v was used for 5months only it have High Temperature Warning and Over Temperature Shutdown abilityWide UPS Mode Voltage: 48 V WaveForm:is Pure Sine Wave Recharging Time is 6 Hrs Lightweight and compact design ensures economy of space and portability. DC Charger enhances battery life and lowers maintenance cost. High surge capability for starting heavy loads. User-friendly graphical display and audible alarms. future upgradeability through Digital Flash memory pls this is an inverter only no inbuilt battery