This is a Long Standing Problem.
Most Solar companys say "it meets the FCC class B standards" and your stuck !
I found that the most Energy is at 200 Kc interval's on the HF bands.
Ray WA6VAB K3.
________________________________
From: elecraft-boun...@mailman.qth.net on behalf of Doug Turnbull
Sent: Thursday, February 6, 2025 10:42 AM
To: Mike Dodd; elecraft@mailman.qth.net
Cc: Don Brennan EI6IL; m...@mandpmechanical.ie; Brendan Minish
Subject: Re: [Elecraft] Noise from Solar System
Dear OMs,
Not sure who started this topic. So I use OM and not your name.
I had great difficulties with a neighbour's system. Installing
filters, chokes, LED couplers only helped a bit. Finally the controller
was swapped our for another by the same manufacturer and the noise dropped
nearly 20 dB. I was plagued on all bands especially higher HF and 6M.
What a difference this made. I suggest your visit a number of hams
with such systems and see what the happier uses have and go with the same
controller they have and optimizers which are on each panel and also can
generate noise. I am all for this and but for the fact that I am 80
and would hardly ever see payback would install solar panels myself.
We run two EVs so it would make good sense. I like the idea
of being green if reasonable and the technology intrigues me. Just be
very careful in choosing your system. Also know that further
improvements can be made with external filtering. Spend time in making
your decision and try to get an installer who will back up his work.
Good luck.
73 Doug EI2CN
-----Original Message-----
From: elecraft-boun...@mailman.qth.net <elecraft-boun...@mailman.qth.net>
On Behalf Of Mike Dodd
Sent: Thursday 6 February 2025 18:27
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Noise from Solar System
On 2/6/2025 11:29 AM, John Pierce via Elecraft wrote:
> I am planning to install Solar on my house. Any experience you have
> had regarding the inverter as an amateur radio noise source would be of
real
> interest. Noise may vary by Mfg or by inverters at each panel on the
roof
> vs one system inverter near my basement. My antenna is a Hex beam an
> the solar system would be about 15' away.
I installed a solar power system in 2012:
<http://house.mdodd.com/project_solar.html>
We have 14 PV panels that produce about 4 KW of solar power, 15 KWH of
battery capacity (to 50% discharge), and an 8 KW inverter in the basement
that is wired into a dedicated breaker box wired to most house circuits
(obviously, no high-power stuff like oven, dryer, water heater). The
inverter does power the well water pump and the geothermal HVAC system.
The only RFI I've experienced is hash on 160 and 40 meters when the PV
panels are producing power (e.g., during the day). Right now it's overcast
and the PV panels are producing 300 watts. Right now the K4's band scope
shows the hash at -110 dB on 40M and -105 db on 160M. 80M is at -115 dB.
My Carolina Windom antenna is about 40 feet above the ground, and parallel
to the buried 150-foot cable from the PV array. The cable is buried in an
18"-deep trench.
I remember carrying a KX3 outdoors with a short wire antenna just after
installing the system, and the RFI was pretty high as I walked over the
cable trench, but decreased rapidly as I moved away.
I have no experience with inverters on the PV panels, but the 8 KW
inverter we have is _not_ the source of my RFI. That comes from the charge
controllers between the PV panels and the batteries.
Hope this is somewhat helpful.
73, Mike N4CF
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