Samlex BBM-1225 12V/24V 25A Battery Backup Charger - Automatic Battery Maintainer for Cars, Boats, RVs & Solar Systems - Perfect for Emergency Power & Off-Grid Applications

This unit is a solid-state device which allows uninterrupted DC power in association with a power supply and a battery. The transfer of load between the power supply and the battery is instantaneous. It also keeps the battery charged by providing float charge. Pre-set for 12V power supply Minor modifications for 24V power supply