Deluxe Starter Set + Off Grid Power is a Deluxe Starter set with Off-grid Controller and Off Grid Inverter. Off Grid controller is a battery capacity multiplier and grid power outage detector. When grid power goes out, it automatically supplies power to your Off Grid Inverter. Off Grid Inverter converts battery energy to grid compatible power so that you can power your appliances. It’s peace of mind for you and your family in any emergency.