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The original was posted on /r/offgrid by /u/ponga2112 on 2024-09-06 13:32:39+00:00.

I have several AC powered clocks in the house, microwave, oven, coffee maker… nightstand. And every single one of them runs fast. They all gain like 8 minutes per month and reseting them on the regular is a pain. This is new build and it’s been that way since moving in. It’s an off grid system with 2 paired Sol-Ark 15k’s. My UPS’s read 59.8 / 59.9Hz and I’ve heard this could be because of some harmonics on the wire (like RFI maybe)? Anyway, has anyone else experienced this or what is the best way to go about diagnosing and fixing this situation? TIA!!