ARLA/CLUSTER: Noticias perturbadoras para a utilização de painéis solares

[João Costa > CT1FBF]

Threat to HF from solar panel change

The creator of APRS Bob Bruninga WB4APR says "I don't want to be an
alarmist, but we need the Hams with the proper knowledge to get
involved in this disturbing news"

His post on the AMSAT-BB, used with permission, says:

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
oroptimizers 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 turing 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 can't miss  em... just sounds like a 60 Hz buzz on all the
harmonics of the inverter switching frequency.

Bob WB4APR

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