[RFI] I would like to compile a list of zero RFI solar power systems that hams own

[James Jordan]

Great project Randy. I can’t contribute any information now but I’ll be very interested in your compilation for a VP5 installation in the future. 
73,
Jim K4QPL VP5M 

Sent from my iPhone

> On Jul 3, 2018, at 5:58 AM, David Robbins <k1ttt at verizon.net> wrote:
> 
> Mine was pretty close out of the box.  All I added after installation were 3
> ferrites on each microinverter because of some very light hash on 10m when I
> pointed a beam right at it.
> 
> http://www.k1ttt.net/misc/pv.pdf
> The microinverters are from Enphase Energy inc. the model number is
> M190-72-240-s11/2, but part of that number are the size of the panel and
> line voltage so there are likely several variations after the M190 part.
> 
> David Robbins K1TTT
> e-mail: mailto:k1ttt at arrl.net
> web: http://wiki.k1ttt.net
> AR-Cluster node: 145.69MHz or telnet://k1ttt.net:7373
> 
> 
> 
> -----Original Message-----
> From: RFI [mailto:rfi-bounces at contesting.com] On Behalf Of Randy Standke
> Sent: Tuesday, July 03, 2018 02:43
> To: rfi at contesting.com
> Subject: [RFI] I would like to compile a list of zero RFI solar power
> systems that hams own
> 
> Hello fellow hams,
> 
> I am giving a talk on ham radio and solar power to a ham radio club in just
> over a week.  I am specifically looking for brand names and types of
> inverters that hams own themselves, and are happy with from a RFI
> standpoint.  And, it would also be useful for the brands and types that did
> generate RFI as originally installed.
> 
> 
> 
> My talk will consist of two parts: 1 - solar power for yourself.  2 -
> identifying RFI signals, locating the house, and reporting RFI generating
> solar systems in your neighborhood.
> 
> 
> 
> I have plenty of material for the Part 2 part due to the continuing
> popularity of one particular brand of solar power system in my neighborhood.
> 
> 
> 
> However, my only experience with a RFI free solar power system is my own.
> That system has no switching circuitry on the roof, and a Fronius inverter
> at ground level.
> 
> 
> 
> I expect the safest route is to do what I did and keep all switching
> circuitry off of the roof.  So, are there other brands of inverters (than
> Fronius) that some of you know of that are RFI free?  Also, the single
> ground mounted inverter plan does come with a back up option.  That being if
> there is some RFI, a single filter at both ends will probably fix it.
> However, the goal is solar power, zero RFI,  no need for modifications.
> 
> 
> 
> The second solar power system I know of is micro inverters.  However, now
> you have a lot of switching circuitry on the roof, much closer to your
> antenna, and if you have noise a fix won't be easy.  If any of you have
> micro inverters, what is your RFI experience and what is the brand?
> 
> 
> 
> The third option are the systems with DC/DC converters (optimizers) on each
> panel.  For now, this one gets a "just say no."  As far as I know, these all
> generate a lot of RFI and I am not aware of a case where it was completely
> solved after much modification to the wiring and addition of ferrite.  Maybe
> future improvements will change my opinion.  Or, reports of a specific brand
> that was RFI free as originally installed.
> 
> 
> 
> Thanks in advance,
> 
> 
> 
> 73,
> 
> 
> 
> Randy KQ6RS
> 
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