Sounds like a faulty connection somewhere. Could be the converter but I doubt it.
I would suggest that he check all of his 12V connections, including the battery and the battery ground to the trailer frame.
There is a plug somewhere (on most pop-ups) that connects the ceiling 12V wiring to the rest of the trailer. Those things are famous for getting corrosion in the connector.
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TrailManor Elkmont
640W solar- 230AH LiFeP04 Battery
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