I got this for a solar panel system. I had no more than set it up and the power went out the very next days. It was out 20 hours. After the power was off about 6 hours. I plugged 1 refrigerator and 2 deep freezes into it. Ran them off my batteries for 4 hours no problem at all. Shut it off for 6 hours to recharge then back on for 4 hours . Power came on the next day. I avoided the loss of 2 freezers full of meat. Paid for itself that day as I would have lost maybe 1500 dollars of meat. I don't have that much in the whole solar set up. Yes I'm pleased.