Wouldn't the noise from semiconductors tend to be random (broadband white
noise) in nature? Much like the added noise from an amplifier due to its noise
figure value? The RFI I have experienced from SolarEdge systems falls at
regular intervals in frequency, the harmonics of a switching frequency. As for
choking the optimizers having little effect, there is a good chance they missed
one or more of them. It took four visits at a house 200 feet from me for the
technicians to find all of them. Even a single optimizer without ferrites
makes a lot of RFI.
73, Randy KQ6RS
-----Original Message-----
From: RFI <rfi-bounces@contesting.com> On Behalf Of Roger (K8RI)
Sent: Saturday, June 8, 2019 5:59 AM
To: rfi@contesting.com
Subject: Re: [RFI] SolarEdge Finds New Source of Solar System RFI
Having been involved with the semiconductor industry since early 1961with
everything from poly crystal Silicon growth, single crystal production, to
device production at the experimental, impurity problems, analysis of chemicals
involved, as well as the maintenance and development of that equipment, I can
think of many possibilities that would cause noise generation in individual
solar cells.
73, Roger (K8RI)
On 6/1/2019 5:59 PM, Tony wrote:
> All:
>
> I recently spoke with an engineer from SolarEdge who said that they
> discovered a previously unknown source of RFI which turned out to be
> the solar panels themselves. They found that the panels were producing
> noise while physically disconnected from the system at a few
> installations.
>
> They are now working with the panel manufacturers Hanwha and Trina to
> determine why a certain batch of their panels are producing RFI. The
> goal is to locate installations with the defective panels and replace
> them.
>
> Cumulative RFI from multiple panels is apparently enough to cause
> serious RFI and may be the reason why my neighbors installation still
> makes noise during the day while the system is turned off. It could
> also be the reason why the choking the Optimizers had little effect.
>
> Tony -K2MO
>
>
>
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--
Roger (K8RI)
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