Grumpy_Git-
None?
In most cases, fucking shit loads. The most common and older models are dirty AF from an RFi perspective. Newer ones are getting better but if you have solar panels they bathe you in radio signals.
This is utterly harmless and undetectable (unless you've got specialist measuring equipment) but its there and surely something nutters will latch on to at some point.
Edit: In the remote possibility that there are other radio nerds here on LFGSS, here's some more info https://palomar-engineers.com/rfi-kits/solar-system-rfi
I'm currently living in a mountain village with a population of 200 and took my radio kit with me in the hope that RFI would be low enough to do some radio astronomy experiments. Because everybody has solar panels and EV chargers, there is more radio interference than in London!
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Stonehedge
Prediction: Its only a matter of time before the 5G conspiracy nuts latch on to how much RFI comes from solar panels and start to claim that they are bad for your health.