[RFI] FW: After 40 years of searching, scientists identify the key flaw in solar panel efficiency

[WW3S]

I’m a newbie at this, but as I understand it’s the optimizers aka conditioners that are some of the problem, the other is the inverter....every panel has an optimizer, in my neighbors case, that’s 21....the other problem is the wiring connecting them, they are daisy chained, think loop, think antenna !! The fix, from what I’m told , is the interconnecting wiring needs to be twisted, wrapped several times thru ferrite core, and instead of daisy chained, at the end of the chain , instead of a loop, come back thru the array, think transmission line rather than antenna !! The connection between every panel needs the ferrite/twisting....I think it was March 2016 QST article, but May 2019 had an article as well as March 2019 CQ

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> On Jun 12, 2019, at 8:34 PM, David Eckhardt <davearea51a at gmail.com> wrote:
> 
> I'll bet the wiring and the expanse of the panels themselves are the
> antenna for all the digital RFI generated by all the active electronics.
> Where are the ferrites being placed - between the panels and the active
> electronics?   Someone brought up the question whether the panels had been
> tested on a range by themselves, of course loaded with resistive current
> sinks and no additional electronics attached.  I doubt this has been done
> to isolate the panels, themselves, of just being antennae for the digital
> RFI generated by the switchers and optimizers.  Does anyone know of or have
> seen this data?
> 
> During our month-long camping trip to south and SE Utah last month using an
> 80-watt (rated) panel to keep the camper battery charged, I discovered that
> if I strung a loop around the panel of the RG-58 coaxial cable, that
> coupled very spikey 120-Hz noise into my radio (Icom 7300).  The braid of
> the coax coupled the noise generated by the charge controller into the Ham
> Stick antanna (with 120-feet of counterpoise on the soil surface).  When I
> re-routed the coaxial cable such that there was no loop around the solar
> array, the noise went away.  With the solar panel system connected to
> nothing, there was no noise even though the panel was measured open circuit
> at 23.5 vdc.  I seriously doubt the noise is produced by the panels,
> themselves.  I'd propose the wiring and the panels are nothing but an
> antenna radiating the digital RFI in the active electronics of the system.
> And I'll bet the most effective location for placement of the ferrites is
> on the wires between the active electronics and the panels.
> 
> Dave - WØLEV
> 
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>> On Thu, Jun 13, 2019 at 12:01 AM <r55stan at 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 at contesting.com> On Behalf Of KD7JYK DM09
>> Sent: Wednesday, June 12, 2019 2:52 PM
>> To: rfi at 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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> 
> 
> -- 
> 
> *Dave - WØLEV*
> *Just Let Darwin Work*
> *Just Think*
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