I also have a few houses for SolarEdge to fix and the excuse of "ferrites
are backordered" is getting old. About eight months old. There has also
been some mention that the solar panels make RFI. I can't buy that until
someone takes a measurement of the level of noise. I suspect it is far
below the level that could radiate. Maybe at the level that requires
connecting the solar panel to the receiver antenna input to hear. In
addition, this problem would be common to all solar systems. But, only
SolarEdge is creating RFI problems for us. I picked up a SolarEdge
optimizer on eBay and fed it with a power supply in place of a solar
panel. Even though it was in idle mode, on a spectrum analyzer I saw the
same RFI that I see on the air. I show this in Figure 3 in the May 2019
QST article I wrote. A link to it is here
http://www.arrl.org/files/file/QST/This%20Month%20in%20QST/May2019/Standke2a.pdf
This can't be blamed on the solar panels.
73,
Randy Standke, KQ6RS
On Fri, Aug 23, 2019 at 4:45 PM Michael Aust via RFI <rfi@contesting.com>
wrote:
> GaryGlad they are working with youAs per chokes type 31 or 75 depends on
> the frequency you trying to suppress RFI EMI Filters from Corcom are nice
> but expensiveIn situations where the Noise EMI is terminated in a low
> impedance or effectivelyAn open circuit with lossy material has affects on
> how it gets suppressed and radiatedSometimes Common mode suppression is not
> enough and that where EMIFilters suppress Non Common Modes issuesGood
> Luck73 MikeWB6DJI
>
> Sent from AOL Mobile Mail
> Get the new AOL app: mail.mobile.aol.com
> On Friday, August 23, 2019, Gary Johnson <gwj@wb9jps.com> wrote:
>
> Here is an update on my particular SolarEdge noise complaint. System with
> panel optimizers was installed in late May. The specific RFI that it
> produces is only at 200 kHz intervals due to control telemetry. The company
> has been responsive. The young engineer I've been working with is Tom "TJ"
> Simpson. He said that anyone, anywhere, that has noise issues is welcome to
> contact him. He lives in the SF Bay area.
>
> TJ Simpson
> Senior Field Service Engineer
> Office: 510.498.3200
> Tom.Simpson@solaredge.com
>
> Last week, TJ and two helpers rerouted cabling to eliminate a big loop.
> Then they installed type 31 big clamp-ons, with a few turns, on each side
> of every optimizer. We had a lively discussion about chokes. Using type 31
> was an experiment (I told him I'm open to that). Their preferred mix is 75
> and he says those have been very effective. Interestingly, he said that in
> lab testing their telemetry would fail with certain chokes... Particularly
> chokes that had what we know to be sufficient choking impedance to do a
> proper job of reducing commmon-mode currents. Makes no sense to me.
>
> I did confirmed that, with system off, it makes no noise at all that I can
> discern (my dipole is 35 ft away from the nearest panel). When reactivated
> post-mitigation, 200 kHz spurs were at least as strong as before, so
> additional work will be performed.
>
> They will be back in 10 weeks to install new optimzers that are
> spread-spectrum. I have direct experience with various SS systems involving
> ground-penetrating radar and certain military equipment. Depending upon the
> occupied bandwidth and the spreading technique this could be either very
> effective or even more annoying than just having a 2 kHz-wide spike every
> 200 kHz. We’ll see. Lucky for me, I have a new remote station going online
> and my RFI-compromised home station will be reserved for experimentation.
>
> -Gary NA6O
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