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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