If this is a Solar Edge system, are they using "optimizers"? They are DC
to DC, but still create switching noise. I'd look there first.
Unless your neighbor switched to a known quiet inverter it was a wasted
exercise. SMA Sunnyboy or Fronius are known to be quiet central
inverters. I have a Sunnyboy 7.7 with Hanwha Q Cell panels and it is
silent. A panel with no built in electronics is not going to make any noise.
73,
Steve
W1SRD
All:
The the inverter on my neighbors solar panel installation was recently
replaced to reduce the RFI caused by the system. The swap only made a
slight change in the interference.
This left the solar panels as the possible source of RFI so my
neighbor and I conducted a test we've done previously which involves
covering each panel with tarps to see what affect it would have on the
noise.
We found that the RFI completely disappeared while the tarps were
blocking the Sun from reaching the panels. The noise returned when we
removed the tarps.
I reported this to SolarEdge and they now believe that the panels are
the cause of the interference. They mentioned 2 other installations
that had this same problem with panels that were manufactured in China
by Hanwha and Trina.
The takeaway is that solar panel systems need to be checked from top
to bottom when checking the system for interference. I'm hoping
SolarEdge will keep this in mind when they address their next RFI case.
We also reported our test results to the company who leases the panels
to my neighbor. No response yet.
Tony-K2MO
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