AC500 & B300K, the expandable power system, will definitely shift the way you harness the solar energy. It's designed to help you go through power outages and stay connected to unlimited energy wherever you are heading. Thanks to the modular design, AC500 welcomes up to 6×B300K or 4× B300S (or a combination of B300K and B300S) expansion batteries for an overall capacity of 18,432Wh and 12,288Wh, respectively, covering your off-grid power needs for DAYS! Luckily, AC300 owners who are looking for a more powerful inverter don't have to order a new bundle because the 5,000W inverter within AC500 can fulfill their demand without a doubt.The built-in inverter delivers 5,000W continuous pure sine wave output and takes up to 10kW surge for a short time at peak power, ensuring anything you plug in will run to its full functionality and potential effortlessly. It is suitable for all scenarios even when camping or having a barbecue in the yard.