Just a comment on solar panels.
The panels themselves produce DC. They should be as QRM free as a dry cell. The inverters that produce mains voltage at the desired frequency may produce RF interference but the better quality ones don’t. Inverters are not normally on the roof, they are more commonly bolted to an inside wall of the building, in my experience. I can walk up to my inverter with a portable radio monitoring a signal on 7090 khz ssb, and even touching the radio antenna onto the heat sink of the inverter produces zero noise, but increases the level of the signal being heard. That inverter is Xantrex brand… this may not indicate all Xantrex inverters are like that, and certainly does not mean all inverters are clean. but they don’t need to radiate noise.
The switchmode power supplies in LED lights, powering routers and wifi connections, computers, game consoles are, in my experience, a more likely source of mains-radiated noise. I’ve had a few of them.
Andrew
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