It probably is true, Jim. The EU has limits that apply in more circumstances
than in the US. For example, below 30 MHz, the only US limits are that which
are conducted onto the AC mains. There are no limits on the conducted
emissions on all the wiring between panels, between panels and optimizers and
between optimizers and the input to any inverters used by the system. If they
are not conducting power onto the 240-volt grid, and these big ones certainly
are not, there may not even be limits on what is conducted onto the
higher-voltage lines.
There are no radiated emissions limits below 30 MHz.
I am going to get out to a few local solar farms here, just to see how much
noise they make. I have been to a few that were quiet, found while on various
road trips, but it was not certain that they were yet in operation.
Ed, W1RFI
________________________________
From: RFI <rfi-bounces+w1rfi=arrl.org@contesting.com> on behalf of Jim Brown
<jim@audiosystemsgroup.com>
Sent: Monday, September 21, 2020 10:04 PM
To: rfi@contesting.com <rfi@contesting.com>
Subject: Re: [RFI] 2 MW Solar Farm
On 9/21/2020 11:30 AM, Bill Steffey NY9H wrote:
> i would say it depends which manufacturer makes the
> controllers/inverters......
Overall system engineering also matters -- how the cables are run, are
they in steel conduit, if not in conduit are they twisted pair, are the
current loops tightly closed, etc. Higher voltage, lower current also
helps reduce noise and boost efficiency.
take a drive by, and hope it's made and
> certified in EU.
Years ago I noticed some products made in EU had better EMC
characteristics. Is that still true/
73, Jim K9YC
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