Durite 12V-24V Electronic Split Charger - 10A
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12 volt dc to 24 volt dc 10 amp split charger. Designed to charge and maintain a 24 volt auxiliary battery from a 12 volt dc 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 12 volt system, so will not charge the 24 volt auxiliary battery until the 12 volt vehicle battery is charged or being charged.
For more information see charging two banks simultaneously.