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How long has it been since the batteries were serviced and load tested? Most inverter issues are from batteries that need attention. Start there and then get back to me if this isn't the problem. All follow ups are included in our fee.
IF you remove them for testing and service, be sure to diagram the cables or take a photo so you can get them back the same way.
And please include the model number of your Xantrex unit so I know what we are working with here.