Tony et al-
This sounds pretty hard to believe to me. The panels normally contain no
active circuitry, so it's hard to see how they could be generating RFI.
The panels may have a series diode. Additionally, the cells themselves
are really, really large diodes. The only thing I can think of is that
they could be getting excited by high ambient RF, and then rectifying
that RF to produce harmonics or possibly cross modulation products.
I have an AM BC station that is less than a mile, line of sight, from my
QTH. During the day they transmit at 44kW. I have tons of RF all over
the place, and it does cause lots of products with other BC stations and
AC line modulated direct-diode supplies.
Just my opinion here...
-Tony, K1KP
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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