It has been years since I was associated with the Silicon industry. I
left in 87 to go to college full time.
The only thing I can think of that would cause a panel to be noisy would
be a faulty cell or cells in a panel.
Although I've been away from the industry for 32 years the architecture
of typical photo-voltaic has changed little.
Stretching my nearly 89 year old memory 32 years is not terribly
reliable, but IIRC the things that can cause panel to be noisy are
either physical connections to, or within the cell, physical
imperfections (microscopic cracks), or imperfections within the crystal
called twinning.
When I left the industry the largest Single crystal Silicon wafers were
about 8" in diameter. Now I believe they are somewhere around 13 to 16"
in diameter, so many more devices with the same characteristics can be
made from one slice. Overall this reduces the amount of poly
crystalline Silicon needed.
The construction is relatively simple, but it requires a great amount of
energy and a lot of nasty chemicals and solar cells do not have an
infinite lifetime.
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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