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Re: [RFI] Covering Solar Panels To Assess RFI

To: Tony Brock-Fisher <barockteer@aol.com>, Tony <dxdx@optonline.net>, Rfi List <rfi@contesting.com>, "Gruber, Mike W1MG" <mgruber@arrl.org>, "Cianciolo, Paul, W1VLF" <pcianciolo@arrl.org>
Subject: Re: [RFI] Covering Solar Panels To Assess RFI
From: "Hare, Ed W1RFI" <w1rfi@arrl.org>
Date: Sun, 30 Aug 2020 15:50:09 +0000
List-post: <mailto:rfi@contesting.com>
This could be misleading. In the unlikely event that the panels themselves are 
generating noise, disconnecting them from the optimizers would remove them from 
a large length of common-mode radiator.  The only noise I could remotely 
imagine coming from a panel would be white noise, shaped by resonances in the 
wiring doing the radiating.  They are diodes, although ones generating voltage, 
so they could be diode noise generators.  Having said that, though, the level 
of noise that comes from a diode designed to generate noise is very low, so I 
am having trouble believing that the panels' diodes could generate noise that 
would be radiated at a level strong enough to cause harmful interference.  I am 
willing to be proven wrong, but my first instincts would be to look elsewhere. 
And if panels were generating noise, a simple capacitor across the output 
wiring should tame it down.

From: Tony Brock-Fisher <barockteer@aol.com>
Sent: Sunday, August 30, 2020 8:39 AM
To: Tony <dxdx@optonline.net>; Rfi List <rfi@contesting.com>; Hare, Ed W1RFI 
<w1rfi@arrl.org>; Gruber, Mike W1MG <mgruber@arrl.org>; Cianciolo, Paul, W1VLF 
Subject: Re: Covering Solar Panels To Assess RFI

The obvious test would be to disconnect the optimizers from one or more
panels, expose them to sunlight, but cover all the rest. This
configuration should be quiet.


On 8/29/2020 7:31 PM, Tony wrote:
> On 8/26/2020 6:53 AM, Tony Brock-Fisher wrote:
>> It is highly unlikely the panels themselves generate RFI without the
>> optimizers
> I agree with you Tony.
> When we informed SolarEdge about the noise disappearing when we
> covered the panels, they came to the conclusion that solar panels
> themselves were at fault.
> The fact is that the entire system shut down when we covered the
> panels so how they can blame the panels and discount the inverter and
> optimizers is beyond me.
> We know what the inverter noise looks like because all we have to do
> to make it appear and disappear is turn it on and off.
> The optmizers get their power from the solar panels so we had to cover
> the panels to stop the RFI they emit. As you know, there's no switch
> to turn them off.
> Thanks to my neighbor, I have unrestricted access to the system so
> I've been able to perform these tests dozens of times. I'm hoping
> SolarEdge will come out and do the same.
> Tony -K2MO
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