... control Auto voltage regulation(AVR),wide input voltage 145V~275V,accurate output,AVR function,adapt all kinds ... battery under-voltage, overload, over-discharge, short-circuit protections Technical specification Model HF-NB14248212482824835248Rated power1400W2100W2800W3500WBattery24VDC/36VDC/ ... ,the buzzer sends out alarm soundShort-circuitOutput short-circuit, a buzzer ringing, 20 seconds after the ...