Are you sure you can't? Since the bus has a
rating of 150 A and is protected by a 100 A
breaker, there is plenty of room to not over amp
the bus from the two sources of power.
The amperage from the inverter will cancel
amperage coming from the utility in the
feeder. The wire will never
Jason,
You might be interested that the vast majority of owners use the
monitoring for maybe two weeks and then no more.
Individual module monitoring is a great troubleshooting aid and perhaps
a sales aid, but (according to the equipment manufacturer info)
essentially a novelty for the
Wow. That's not my experience at all. We have a bunch of people who hound
me monthly about production levels. We do have a lot of retirees around
here with nothing better to do :) but I find that many of our customers
don't really look at production much in the beginning, perhaps because they
do
I agree. With a 150A bus being fed by 100A from the grid leaves 80 additional
amps (120% of 150A) to feed the bus from outside sources. It seems to me that
40A of PV being back fed will be just fine.
Aaron Mandelkorn
NABCEP Certified PV Installer
Renewable Energy Outfitters
Box 65 Salida,
It seems to me that the conductor should not be subject to the 120% rule
despite what the code says. The potential safety issue here is overloading
the neutral bus, right? While feeding currents could be additive in the
panel, they would be subtractive on the feeder, no? I seem to remember
Mr. Brooks had an email on this topic on 5/8, 12:58pm ET. NEC officially
says that the conductor needs to be upsized but the 2014 will fix it
because that is dumb. I've copied some of Bill's email below.
**
The key distinction was used in my proposal to the 2014 NEC that removed
the statement
I agree with Dave, as do most AHJ's around Southwest Florida.
We're stuck with the strict reading of the code, despite the craziness.
Pull new, larger wire.
Jason Szumlanski
Fafco Solar
On Fri, Sep 28, 2012 at 10:02 AM, Dave Click davecl...@fsec.ucf.edu wrote:
Mr. Brooks had an email on
Bill, one of the byproducts that I don't see Enphase marketing yet is the
detailed documentation of not only their own model reliability and but more
valuable to us would be the data on module reliability by brand and model
number. No one else has a million unit test bed.
Bill Dorsett
Hello Wrenches,
Ever installed Princeton Power inverters? Opinions?
Jason D. Kechijian, LEED AP BD+C
Senior Project Engineer
NABCEP Certified Solar PV Installer™
NABCEP Certified Solar PV Technical Sales Professional™
SolBright Renewable Energy, LLC
jkechij...@solbrightre.com
sol...@me.com
But it's my understanding this isn't a tap and so not under those rules.
There is no way with breakers on both sides to get more than the 100 amps
through that wire.
Jay
Peltz power
a
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Keep in mind that Mac asked us about application of a specific section of
the NEC, not if the rule makes any sense.
William Miller
At 05:32 AM 9/28/2012, you wrote:
Are you sure you can't? Since the bus has a rating of 150 A and is
protected by a 100 A breaker, there is plenty of
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