24VDC to 12VDC 20A split charger. Designed to charge and maintain a 12V battery from a 24VDC system. It has a three stage micro processor controlled charging system and uses voltage sensing for automatic cut in and drop out of charge from the 24V system, so will not charge the 12V battery until the 24V batteries are charged or being charged. Designed to work with stop-start technology complying with Euro 6. 20A can be used through a 13Pin trailer sockets.