Oil changes due every 50 hours - If you run 8 hours a night, you will need to change the oil every 6 hours.
No fuel consumption is quoted, but it looks to be a copy of the honda eu22i generator, which has roughly the same tank size, and lasts 8.1 hours on eco at 1/4 the rated output. Wouldn't expect the knock off to have the same economy as the honda, so don't count on it running all night.
Have you looked into CPAP machines that are designed to run of batteries?
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