I doubt that the foam will do all that much. First, as you point out, the noise
is probaby being radiated by the wires, not the box. Second, RF-absorber foam
is usually not very effective at HF. It may gain a few dB above 30 MHz to
allow a device to pass radiated emissions tests, but on HF, it would generally
be pretty useless.
If the engineers are not aware of good EMC practices, this may explain some of
the reasons that some of these installations do not seem to have RFI cured when
the engineers or installers install "cures."
Mike Gruber, can you pass along to the Solar Edge engineers you work with some
feedback on the effectiveness or lack therof of some of the things they are
trying to fix?
-----Original Message-----
From: RFI [mailto:rfi-bounces@contesting.com] On Behalf Of Tony
Sent: Saturday, October 06, 2018 3:59 PM
To: rfi@contesting.com; Gruber, Mike W1MG; Tony Brock-Fisher
Subject: [RFI] Solar Panel RFI in Kings Park - Update October 4th 2018
All:
The RF Engineers from Solar Edger came out to my home this week to assess the
noise emanating from my neighbors solar panel system.
They plugged into my antennas to view the spectral noise on my receiver which
they then compared to the spectral noise that appeared on their portable setup
near the solar panels. They determined the noise to be one and the same.
The next course of action is to improve the ground system and install RF
absorbing foam to each optimizer. I also convinced them to replace the snap-on
ferrites located at each optimizer, with larger ones so they can loop several
turns of cable around each core.
They originally said they would just go with the RF foam which is
puzzling: I don't understand how encasing a noisy device with this stuff could
suppress RFI when the device is attached to long runs of cable that act like
antennas. Can anyone explain how that would work?
Tony -K2MO
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