Xantrex Freedom X 1200 Sine wave inverter.
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This was seldom used on a camper trailer, which was two years old. It was replaced with a new one when electrical issues developed on a trip. The dealer we had to use while on the road didn’t bother to determine what the cause of the issues was. It turned out we had bad batteries (also only two years old) and the issues continued until the batteries were replaced.