This started as just adding a kitchen / drawer system. After it was finished, it was determined that there was a need for on demand power. So second battery w/ isolater was added in engine compartment. Ran 0/1 power cable to the back cargo space. Now have a 1200w/600w pure sine wave inverter. And a fused block to power a compressor, water pump and aux exterior lights. Once the 21 gal. fresh water tank and compressor are installed, have planned to add 100w solar panel with a controller.