My solar array communicates over the power line to the controller in my
house on 64khz I think it was... never heard it anywhere else... works fine,
kw's of other rf doesn't bother it. yes, it can be done without rfi.
David Robbins K1TTT
e-mail: mailto:k1ttt@arrl.net
web: http://wiki.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://k1ttt.net:7373
-----Original Message-----
From: RFI [mailto:rfi-bounces@contesting.com] On Behalf Of Dale Johnson
Sent: Sunday, May 06, 2018 20:19
To: Tony
Cc: rfi@contesting.com
Subject: Re: [RFI] NEC Code Requirement May Increase Solar Panel RFI
To add, California is attempting to mandate all new houses have solar
panels.
Dale, K9VUJ
On 06, May 2018, at 15:05, Tony <dxdx@optonline.net> wrote:
All:
Bob, WB4APR, outlines the potential for solar panel RFI to become worse than
it already is. Effective January 1st, 2019, the NEC will require solar panel
modules to signal via DC power lines. See below.
Tony -K2MO
______________________________
I don't want to be an alarmist, but we need the Hams with the proper
knowledge to get involved in this disturbing news.
The National Electric Code now requires electronics on every module of a
solar array communicating via signalling on the DC power lines to assure
EACH pair of panels can shut down independently. This is to make all
possible faults never allow more than 80 volts anywhere in the system.
This is effective 1 Jan 2019
This is the nail in the coffin of simple DC series string arrays which are
the quietest systems and almost demands microinverters or optimizers on
every panel. Refer to the QST article a few years ago about how disastrous
optimizers are to RFI and HF operations with modules all over the roof..
Here is the Solar news:
https://solarbuildermag.com/bos/nec-2017-module-level-solar-system-shutdown/
Also, what is going to happen to an array that has signaling all over it in
the near field of HF?
Although you can avoid it by going solar before then, you may have problems
when your neighbors go later.
I hate to be an alarmist but we all know what happens when ham radio and
commercial systems are incompatible and even though Ham radio might be in
the right, we are only 1 in 600 and no one is going to side with us.
We took on broadband over power and squelched that dumb idea, but now this
has the potential for equal demise of Ham radio. It should be fixable, but
we also know that there is high competition in the solar market and the
modules that are made the cheapest will be popular and will likely not be
adequately filtered.
If nothing else, we need to find out what systems are terrible emitters and
nip them in the bud. Maybe all it takes is driving by solar systems you see
and turning on your AM radio on a weak signal channel and seeing if the
background noise peaks near that home. But also it has individual peaks, so
it might also be nice to tune around too find the max and then check the
range. I find the noise can go hundreds of feet along the power lines....
You cant miss em... just sounds like a 60 Hz buzz on all the harmonics of
the inverter switching frequency.
Bob
WB4APR
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