Strong overload capability, High efficiency up to 94%, Built-in backfeed relay, Built-in OVCD protection, Large charger up to 8A for longrun model, Output power factor 1, Wide input voltage range (110-300 VAC), Active input power factor correction 0.99, 50Hz/60Hz frequency converter mode , Emergency power off function (EPO), ECO mode for energy saving, Generator compatible, Adjustable battery numbers, Optional compatible with Lithium battery (192~240VDC) only for 6K/10K.