All:
My neighbor gave me permission to shut off his SolarEdge solar panel
inverter while I ran some tests. I recorded the results at my home
station and noticed that the S-9 spikes disappeared when the inverter
was turned off. The noise floor also dropped considerably.
A few remaining spikes were tracked to the cabling that feeds the solar
panel optimizers which were still running in safe mode. Unfortunately,
there's no way to shut off the optimizers without physically
disconnecting them.
The noise reappeared when the inverter was turned back on.
Before I left, I decided to probe the AC lines running off the house
main panel for RFI. Sure enough, there were high levels of the same
noise on the the exposed lines that run along the basement ceiling of my
neighbors home. All that noise is feeding into the AC lines so the house
wiring makes for one big antenna.
Less significant, but worth mentioning is that the inverter does not
have a dedicated ground rod. It's grounded instead to a water pipe in
the basement which then splits to the main panel with a 6 foot ground wire.
I also noted the model number of the inverter and found that it's the
same 6KW unit that Tony Brock-Fisher found to be very noisy.
More to come.
Tony -K2MO
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