... RS232 port Charge current adjustable3, DC voltage: 12V DC, 24V DC, 48V DC4, battery charger buit in: 35-70amp5, pure cooper ... mode: Three stage, boost Constant Current; Boost Contant Voltage; float(with small current 7,capable of starting electric motor ... 20% typical of nominal voltageRegulation±3% of selected output voltage(Battery mode) Transfer timeBlackout 3ms typical,Brownout 1ms typical,Battery ...