START PAC MODEL 53300ND is a 28.5 volt continuous DC power supply when plugged into 220Volt single-phase AC power. This unit will deliver 300 amps +5% DC output with no duty cycle, but will not provide enough current for engine starting. This unit is designed for maintenance and to power up various functions such as inverters, avionics, GPS and air conditioning. It is not for battery charging. This unit provides current/voltage/temperature protection and weights 40lbs/18kilos. The dimensions are L 19”xW 13”xH 7” and are provided with custom cable lengths ranging from 6 feet to 15 feet.