Not that unusual for the clock to be somewhat inaccurate but gaining an hour overnight is more extreme than most that I have seen. The clock circuits assume you are going to be on power company regulated 60 Hz electricity. Inverters, especially the non-sine wave inverters do not provide as stable a frequency so the clock drifts. I changed my inverter out with a pure-sine wave model and my clocks remain pretty close. If you run on generator long enough you may notice a slight difference. My generator is off by about 0.3 Hz.
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