The high temperature protection of the unit reduces the output current in case of overheating. The low weight of the unit makes it ideal for use in highly vibrating generator control panels. The small dimensions allow compact panel design. Thanks to their high efficiency, the self-heating of the chargers is kept in minimum levels allowing operation in warm environments. The chargers are able to operate in parallel with the engine’s charge alternator and other battery chargers. Multiple units may be connected in parallel in order to obtain higher current ratings. The wide input voltage range allows the chargers to be used in most countries. The rectifier fail output is provided as a standard feature. This is a semiconductor output pulling to battery negative when the unit is not operating. Thanks to this output, a rectifier fail signal is provided for the genset control module which will give an alarm in case of failure. The units provide a “boost charge” input as a standard feature. When this input is pulled to battery negative, the output voltage of the charger will be set to the boost charge voltage. This feature may be used temporarily to improve battery life. The chargers have open chassis, metal cased design, suitable for bolt and stud mounting in an enclosed panel.