We had to replace the inverter in our coach this past winter. Our experience is documented here in the Forum. I would recommend taking your coach to an technician certified in the repair and replacement of, in your case, Xantrex inverters. I used RVMD located in Tucson for my work. RVMD is certified by both Xantrex and Magnum for repair and replacement. We had a Xantrex that was original to our coach. It had a 2003 sticker on it. We replaced the Xantrex with a larger capacity Xantrex. We have been very happy with the new inverter.