It appears they are still researching the cause/mechanism now that
they've discovered a source.
Signal strength? I've not found any concrete numbers. Theoretically it
might be several watts with the panel architecture serving as the antenna.
Personally, I'd guess it's of a nature and strength that could be heard
for no more than a few hundred yards.
BUT as I've said before, I left the industry in 87 so my knowledge is
old knowledge plus a little leakage here and there..
Panels now cost a fraction of what they did back then even though the
poly crystalline Si price is much higher. I think it is currently
around $60 USD per Kilo after hitting a high of over $200.
I know one company built an entire plant and made the decision to never
start it. It never had chemicals in the pipes. Imagine the tax write off
for that.
With the price decline there will be a big shakeup in the poly
producers. There will be a push to cut corners and that will likely
create problems.
I think China is the largest producer of panels and IIRC they stopped
subsidizing the solar panel industry.
I believe the system installation now costs more than the panels and the
recent numbers I saw show good panels with about a 20% conversion rate.
Again another reason for fabricators to cut corners.
73, Roger (K8RI)
On 6/12/2019 8:01 PM, r55stan@gmail.com wrote:
What is the noise voltage level (or power level into a load) from a solar
cell? For example, if it is -120 dBm and the signals coupled from the
wiring of a solar array to your antenna is 50dB lower, you would never pick
up the -170dBm signal. It would be good to have some measured values to
know if solar cell noise could radiate a detectable signal.
I have also been told by a SolarEdge engineer that the solar cells might be
part of the RFI problem. However, when I asked him to explain why, he could
not. What I would believe is there could be some interaction between the
switching in the optimizers and the solar cells and due to their size, the
solar panels can radiate these signals.
Randy KQ6RS
-----Original Message-----
From: RFI <rfi-bounces@contesting.com> On Behalf Of KD7JYK DM09
Sent: Wednesday, June 12, 2019 2:52 PM
To: rfi@contesting.com
Subject: Re: [RFI] FW: After 40 years of searching, scientists identify the
key flaw in solar panel efficiency
"What does this have to do with RFI? Doesn't most if not all the RFI hash
from solar panels emanate from the inverter, not the solar cells
themselves?"
If you've been on the list for at least a week, there's been extensive
recent discussion of the panels themselves being capable of producing a
considerable amount of noise with references going back roughly 60 years due
to numerous reasons. It's not too common, but it can happen.
Kurt
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Roger (K8RI)
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