Tony,
There are MANY variables and wiring errors and system layout errors that
can contribute to how much RFI is radiated. One issue that Teff
communicated to me was that the framing holding the panels was bonded to
ground on the other side of the building from the power entry. If this
is true, it creates a current loop that could be causing or contributing
to your problem.
Wiring can be prevented from radiating by shielding, IF, AND ONLY IF,
the shielding is continuous. In the real world that I'm aware of, the
only shielded AC wiring is that which is enclosed in steel conduit, that
is continuously bonded together. That's quite rare in residences, except
in cities like Chicago, where the Electricians Union has it written into
the city's Electrical Code as a means of providing more work to
Electricians.
Running twisted pair for power can prevent radiation from the
current-carrying conductors (phase and neutral), but won't help with
common mode RF current, which is nearly always on the green wire. And
the common mode current is there because of bonding failures, either in
the construction of the equipment itself, or in the installation, or both.
The wiring inside the home could be hot with RF as a result of wiring
errors at outlets, at panels (double-bonded neutral), even bonding at
equipment. At the home I bought in California, I found an outlet wired
with neutral and ground reversed, and I found outlets in the kitchen of
a "mother-in-law" garage apartment fed between phase and green rather
than phase and neutral. I also found no ground at all at the service
entrance -- it was bonded to a hose outlet that was fed by PVC pipe!
73, Jim K9YC
On 9/25/2020 3:22 PM, Tony wrote:
All:
The reports I've read suggest that the strength of interference caused
by solar panel systems can vary from one installation to the next EVEN
when the distance to the source is similar. That variation could be
attributed to radiating conductors tied to the system such as the house
wiring.
We found high levels of RFI on the A/C lines throughout my neighbors
home and that's likely the case with all Solar Edge installations since
there are no chokes between the mains and inverter.
Given those facts, would a large home with long runs of un-shielded
Romex produce higher levels of interference compared to a smaller home
with shorter runs? Or does the resonance of the wiring play more of a
role than length and number of runs?
It's an oversimplification, but it seems logical to consider what's
connected to system and not just the system itself.
Tony -K2MO
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