This system is ready to go - just connect your solar panels and battery bank and you're generating and storing power. The Trace/Xantrex inverter will also connect to your grid power and manage the sale of excess power back to the power company and manage a connected auto-start generator to keep power flowing and recharge the batteries if they get low.The item "Trace/Xantrex 4000 Watt On/Off Grid Solar Power Balance System" is in sale since Sunday, August 4, 2019. This item is in the category "Home & Garden\Home Improvement\Electrical Supplies\Alternative Energy Supplies\Solar Power Supplies\Solar Panels & Kits". The seller is "rodneymnemonic" and is located in Chesapeake, Virginia. This item can't be shipped, the buyer must pick up the item.