The AStuff ShorePower solution transitions ECU power from car power to shore power without a power-down. This solution also maintains battery charge level when plugged into a 20 amp/120 VAC supply. When parking a vehicle equipped with the ShorePower kit, put your vehicle in park, leave the engine running and plug in the included cord to a 110 AC 20 A outlet. Then you can cycle off the vehicle ignition without losing power to your computers, sensors and other devices. This will allow for proper shutdown of in-vehicle ECUs and will eliminate the need to leave a vehicle running while parked.