[RFI] Another Solar Panel RFI System

[Hare, Ed, W1RFI]

As near as ARRL's work can tell, the interference from Solar Edge equipment is not being significantly radiated from house AC mains.  W1VLF has used a probe to sniff the wiring of a Solar Edge system at his house and found that the emissions from the solar-panel wiring were much greater than the emissions from the AC mains.

We do NOT want to hang this issue on compliance with the Part 15 emissions limits because if the FCC were to see that as the line in the sand on harmful interference, then systems that comply with the limits would be pronounced to be clean by the FCC and cases would be closed.  To file a complaint about emissions limits, amateurs would have to make measurements, which in the case of a multi-kW inverter, would be well beyond the ability of even most test labs.

Cases of interference from Part 15 and Part 18 devices are being resolved on the basis of harmful interference.

For lower-powered consumer devices, we DO find devices that exceed the limits, and ARRL is setting out to obtain and measure more of these devices and report them to the FCC.  If a device exceeds the limits, then that is a rules violation even without the presence of harmful interference. Our AM-broadcast connections are very interested in this, because many devices that meet the limits on 1.8 MHz and up do not meet the limits in the AM broadcast band.  Those that fail on the AM broadcast band also fail on 630 meters, which ARRL does have standing to form the basis of a complaint.

Ed, W1RFI
ARRL Lab

________________________________
From: RFI <rfi-bounces+w1rfi=arrl.org at contesting.com> on behalf of Jim McCook <w6ya at cox.net>
Sent: Thursday, December 15, 2022 8:54 PM
To: RFI List <rfi at contesting.com>
Subject: [RFI] Another Solar Panel RFI System

All the RFI problems I've seen from neighbors have been solved by
isolating the problem device from the line with an adequate EMI filter
from Corcom.  One LED strip lighting problem was solved only by changing
to a analog power supply.  How many sources of RFI are there that DO NOT
utilize the house wiring, at least partially, as the radiating antenna?
Can it be proven that RFI below 30 MHz from solar installations is ONLY
from direct radiation and not from house wiring?  I would like to see
some proof.

Jim W6YA
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