Thank you for the information.
That is it in a nutshell. I am waiting for approval for the program, If
approved then I can go forward to begin purchasing the system and start
building it.
Thanks again for this info,
73s
"Jeff Liebermann" wrote in message
...
On Tue, 28 Jul 2015 07:05:54 -0400, "Tom" wrote:
Do you folks have any comments on these new Micro Inverters? Specically
the
Enphase M215. I understand there is a new one Enphase M215 IG I believe
that
addresses the interference experience by hams on VHF band. These are the
Micro Inverters two suppliers tole me to use that qualify for the Ontario
Microfit program. I reading reviews on Amazon that they are very
interfering. Is there a way of grounding them or a equal alternative model
that doesn't interfere with ham bands during peak sunlight hours? I need
to
put 50 of these on my roof under each panel. Any and all comments are
greatly appreciated as always. Thanks Gents,,,
I help maintain a few grid tied solar systems. Most use Enphase micro
inverters. The latest uses M215 IG inverters. Previous models were
totally floating and had no grounding points or fault protection. The
IG means "integrated ground" and also has a built in ground fault
protector. The grounding change probably has nothing to do with
EMI/RFI. There are also Chinese clones of these inverters, which
ended up at one of these systems thanks to a fly-by-night solar
contractor.
My guess(tm) is you're dealing with conducted EMI/RFI, not radiated.
Therefore, clamp on ferrite beads and blocks should work.
http://www.solar-electric.com/installation-parts-and-equipment/electrical-devices-transfer-switches-noise-filters/nosufefi.html
When I complained on behalf of one customer that the inverters were
trashing OTA TV reception, they installed the ferrite beads for free.
I don't think Enphase supplied the ferrites. It's mentioned in their
troubleshooting guide, but nowhere else:
http://www2.enphase.com/global/files/Enphase_Troubleshooting_Guide.pdf
See Pg 22. Note that the filters go as close to the source of the
noise (i.e. the M215 IG micro inverters) as possible.
I think the M215 IG uses the same 144KHz communications frequency and
Zigbee protocol as most everyone else. The problem is that it uses
the same power lines that are conducting the switching noise for
communications. If your added ferrite beads clobber this signal, the
Envoy controller box is going to complain that it can't communicate
with the panels. So, be careful when you add a ferrite block as too
big a block, wrong material, too many beads, or too many turns, is
going to cause problems. I would aim for a 500 KHz low-pass corner
frequency.
As for grounding, the evolving NEC Article 690.35 for the US requires
that literally everything on the roof be well grounded. Since I
believe that the noise will be conducted rather than radiated,
additional grounding isn't going to do anything useful. In my never
humble opinion, filtering is your only option.
Good luck.
Light reading:
http://www.homepower.com/solar-electricity
--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558