The only RFI I usually get in my OFF_ROAD POPUP setup is coming from my standalone POWER INVERTERs being run off my battery bank. I have a 600WATTS PSW Power Inverter ON all the time running two 120VAC Drop cords with multihead connectors on the end. These two electrical drops are Velcroed to the back of a cabinet top available to use 120VAC items... My Ham radio picks up all kind of RFI noise from this setup...
I have a 1500WATT PSW Power Inverter to use as well but it very seldom turned on... It also will generate a lot of RFI signals. I guess the very expensive Power Inverters like those used in the house UPS UNITS are pretty much RFI free... My House 1000Watt UPS Unit runs all the time with no RFI signals being generated on my Ham radio bands...
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My daily camping off-grid routine is to run all my needs off the battery which require me to run my 2KW Generator each morning for three hours starting at 6am during breakfast to get my battery bank back up to there 90% charge state so I can do all of this all over again for the day/night run off the batteries...
It is a challenge sometimes...
Roy Ken