[aprssig] FYI: : Solar Ham Radio Interference

noskosteve at yahoo.com noskosteve at yahoo.com
Sun Nov 20 11:37:41 EST 2016

While this is a little OT, the LED transition is happening much faster than residential solar PV and they are very good garbage generators.  Even if they pass Part 15 (individually), they'll be hundreds in your neighborhood.
I have an 8w desk lamp that generates more RF noise when it is off than on (soft switched).
Just sayin'.

Regards, Steve Noskowicz K9DCI 
Science & Technical Advisor
From my tablet.

-------- Original Message --------
From:KF4LVZ <aprssigZbr6 at acarver.net>
Sent:Fri, 18 Nov 2016 22:59:23 -0700
To:aprssig at tapr.org
Subject:Re: [aprssig] FW: Solar Ham Radio Interference

>You can't use string inverters on an array that receives partial shade
>otherwise your array efficiency will be lower.
>On 2016-11-18 17:11, Robert Bruninga wrote:
>> Previously QST and my emails discussed the rise in the noise floor from home
>> solar and my suggestions to avoid purchasing a system with micro-invrters or
>> elecronic "optimizers" on every panel on the roof, and stick with the
>> wuieter or easier-to-fix all DC wiring and central inverters.
>> THAT’S NOT ALL!   It was pointed out at the ARISS meeting this weekend that
>> one must also watch out for their NEIGHBORS!  That is, if you want to keep
>> your clean noise floor for your own hamming and your own solar, you must
>> also be vigilant of your surrounding neighbors.
>> The time to make friends so you can guide their future investment is NOW,
>> well in advance before they make an irreversible decision.
>> Ill try to remember to go out and see how far the noise radiates from some
>> of the other solar panels in my neighborhood.  Although my DC system with
>> central inverters is much quieter, I should go out and see how far beyond
>> these houses, the various system's interference can be detected.
>> Bob, Wb4APR
>> -----Original Message-----
>> From: Robert Bruninga [mailto:bruninga at usna.edu]
>> Sent: Sunday, October 23, 2016 12:55 PM
>> To: Amsat BB
>> Cc: bruninga at usna.edu
>> Subject: Solar Ham Radio Interference
>> Not Satellite related, but people often ask about any RFI from my solar
>> arrays at home.  Interest stems from an RFI issue in April QST and my letter
>> in Sept 2016 QST.
>> Well, FINALLY, the jury is in.  For the first time since installing solar, I
>> finally got all my full-sized dipoles up in the air again. And listened with
>> the arrays on and off.
>> Yes, I have inverter noise about 12 dB above the noise floor every 38 kHz on
>> 80 meters,. But couldn't really find anything on 20 meters.  I did not do a
>> thorough search, but enough to finally say, "yes, there is some noise..."
>> I post this because my 16kw of arrays are conventional series string arrays
>> and much quieter than the  "optimizers" on every panel all over the roof
>> noted in the April QST article.  I always thought my string array was quiet,
>> but now I have some data noted above.  This could easily be fixed with some
>> clamp-on ferrites down in the basement on the wires going into the
>> inverters...
>> But for my rare HF operating, the solar AC disconnect switch is about 3 feet
>> from the kitchen door.  Easy enough to pull if I want HF silence.  I could
>> also install a 40 amp disconnect relay from a switch in the shack...  But
>> with my rare operating style, I'll probably do nothing.  Of course it is
>> perfectly quiet at night ;-)
>> It took me 6 years to get around to this test, so don't hold your breath
>> waiting for me to add some clamp-on filters to the inverter wires and see
>> what that does.
>> For those into solar, come join us on SolarDIY at yahoogroups.com Bob, WB4APR
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