28A battery charger with a 5A battery saver. Designed for DDEC Vehicles. Automatic operation regulates the output to multiple battery banks. A patented built-in sense circuit checks the battery voltage 120 times per second to compensate for a voltage drop in charging wires providing a quick re-charge without overcharging. Model D: two battery banks, Model D2: three battery banks. Separate 5A Battery Saver output eliminates any drain from auxiliary loads on the vehicle battery when in the station_Automatically disconnects auxiliary vehicle loads from the battery when the charger is energized and powers them from the internal power supply_Not recommended for powering highly sensitive electronic loads. Front panel LED displays AC power applied and Battery Saver circuit overload. Includes a heavy duty aluminum case designed for emergency vehicle use