The ST - III series power supply is a DC power system designed specifically for RVs with an optional battery backup. The power supply system is powered by 240V AC and provides an isolated 13.65V DC output at 20A and 35A respectively for powering the load and charging the battery. The power supply system also provides all necessary load and battery protection and operating features. An optional DC input is also provided to enable battery charging and load powering from an external +13.8V DC power source. The power supply system is fully enclosed and ready for direct wall mounting. All connections are at the rear of the power supply system, providing convenient wiring and installation. User access to all load and battery fusing is provided from the front of the power supply system.