[RFI] SolarEdge Finds New Source of Solar System RFI

r55stan at gmail.com r55stan at gmail.com
Sat Jun 8 11:29:02 EDT 2019

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 at contesting.com> On Behalf Of Roger (K8RI)
Sent: Saturday, June 8, 2019 5:59 AM
To: rfi at 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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