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Well that is something new…….if the microwave is also on the inverter circuit that feeds all three TVs? If yes, then maybe a short time duration power line spike/drop affects the Axxera tvs, while the microwave remains unaffected. A 1000 watt inverter seems small to run a microwave and three TVs though. The question is why the 30 minute hit on power line only when running on shore or generator? There would be a hit on AC power when transferring from inverter to shore or generator power and back to inverter power again that would do it, but why the regular 30 minute cycle? Did this problem just start after something else electrical was changed in the coach or has it always been an issue?
Just for fun and giggles I would be tempted to ensure the inverter AC line which feeds the TVs and microwave wiring connections (H, N, G) are all tight, both at the inverter output and at the AC breaker panel. Take care to shut off all power sources when doing that of course. I would also turn off the two largest TVs and just run one small Axxera by itself and see if the 30 minute shut off cycle continues.
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