... select the output voltage of 12V / 6A or 24V/3A.3,Main features:(1) Constant currentWhen charging the battery voltage ... maximum current (12Vbattery unit is 6A,24V battery unit is 3A) for fast charging.(2) Current limitingWhen the battery is ... genset, accessories for diesel engine and genset control system, e.g. engine controller, water preheater, automatic voltage regulator, generator synchronizer, ...