It doesn't sound like you have a "supply side connection". It sounds like
you have a "load side connection" which is upstream of the transfer switch
but still downstream of the service disconnect.
Mark Frye
Berkeley Solar Electric Systems
303 Redbud Way
Nevada City, CA 95959
(530) 401-8024
That sounds right, which means that the existing wiring between the service
disconnect and the transfer switch may also need to be evaluated since it will
now have sources available at both ends. The rule applies to all bus bars and
conductors "upstream" of the interconnection point as I unders
Bruce;
Let me know if you find any. I have a client in need of a single 200.
I'm talking the 68 Voc type.
DAN FINK
Bruce Erickson wrote:
Hello Wrenches,
Does anyone know of a source for Sanyo HIP 190's, 195's, or even 200's? We have a customer who would like to add 4 to an existing array of
Well yes but, 690.64 (2) is titled and reads "Bus or Conductor Rating". The
"or" is important and the 120% requirement does not apply to the upstream
conductors, in this case.
In general, if the sudpanel of 225A where backfeed with the 120A of PV and
had a 150A breaker on its feeder from the main
There is a good Technical Note on the SMA website that talks about sizing an
AC combining panel that may provide some guidance on this.
http://download.sma.de/smaprosa/dateien/4307/Multiple%20SB%20Installation%20
on%203%20Phase%20Utility%20Tech%20Note%20V21.pdf
-Glenn Burt
From: re-w
Could someone please provide me with that generally accepted equation when
it comes to estimating AC output from a PV array versus the STC rating?
That is, I'm looking for that equation which estimates the losses due to mod
mismatch, soiling, wire losses, etc., etc. I've got someone who mistak
Marco
I use 75% as a general rule, it seems to work out well. I've gotten upwards
of 80% on certain enphase & sanyo installations.
Mike Nelson
MD Electric & Solar, Inc.
Gualala, Ca. 95445
On Tue, Oct 12, 2010 at 6:17 PM, Marco Mangelsdorf wrote:
> Could someone please provide me with that gener
Yeah, but I'm looking for the equation as to how you get to that 75-80
percent figure.
marco
Marco
I use 75% as a general rule, it seems to work out well. I've gotten upwards
of 80% on certain enphase & sanyo installations.
Mike Nelson
MD Electric & Solar, Inc.
Gualala, Ca. 95445
On
Marco,
This may be what you are looking for:
http://rredc.nrel.gov/solar/calculators/PVWATTS/version1/derate.cgi
Kent Osterberg
Blue Mountain Solar
Marco Mangelsdorf wrote:
Could someone please provide me with that
generally accepted
equation when it comes to estimating AC o
Marco,
Just playing around with these factors a bit shows you can get 90%, if
the modules have -0% tolerance and they are spotless clean.
Kent
Kent Osterberg wrote:
Marco,
This may be what you are looking for:
http://rredc.nrel.gov/solar/calculators/PVWATTS/version1/derate.cgi
Hi Marco,
First off, the P-ptc/P-stc ratio is 90% if you have a high-quality module.
>From their things get progressively worse.
IMHO it is like peeling an onion. From the outside it can be reduced to one
simple statement. Then you can investigate some of the simplifying
assumptions and make more
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