Each microinverter string needs dedicated overcurrent protection. If
combining strings on the roof for a single run back to the interconnection
point, you need each string to have it's own breaker/fuse. The other option
is to run each string back to the interconnection point separately, but for
a
Hi Jason,
Always good to get a different view on how to do it.
I've always found it easier and cheaper to pull the circuits off the roof to
the AC combiner, so my overcurrent is in a different location
Jay
Peltz power
On Apr 30, 2014, at 5:08 AM, Jason Szumlanski ja...@fafcosolar.com
There are good reasons to want to put AC
combiners under modules, but some reasons not to
want to. An AC breaker is far more likely to trip
than a DC string fuse, due to the surge
availability. As a PV system is designed to last
a minimum of 25 years, the installer might not be
the one to
Yep they make them
http://w3.usa.siemens.com/powerdistribution/us/en/product-portfolio/meter-load-center/Documents/SIE_BR_SOLAR.pdf
Jay
On Apr 30, 2014, at 6:56 AM, Jason Szumlanski ja...@fafcosolar.com wrote:
Yeah, #10 wire is pretty cheap, especially when purchased in bulk, as are
An AC breaker is far more likely to trip than a DC string fuse
I completely disagree. We have never, not once, had to reset a tripped
inverter output circuit AC breaker that I know of, but have replaced many
dozens of DC string fuses and GFCI fuses in inverters, most of the time for
undiagnosed
Inverter ground fault fuses certainly do
blow. What is causing your string fuses to go?
At 10:17 AM 4/30/2014, you wrote:
â
An AC breaker is far more likely to trip than a DC string fuse
I completely disagree. We have never, not once,
had to reset a tripped inverter output circuit
AC
Usually it is repairing work of others who miscalculate the required
rating. When it gets really cold (that means 0ºF here), we start to get
calls with blown fuses. We do have our fair share of unexplained blown
string fuses, and I attribute most of those issues to extreme heat in
enclosures that
690.9(D) is not applicable to the original discussion because we were
talking about an Inverter output circuit, not a PV Source or Output circuit..
690.34 may apply if you call a SolaDeck with breakers a junction box, but I
can see that being a stretch in the mind of many.
My and Ray's question
I think 240.24(A)(4) allows the installation of the inverter OCPDs in
the SolaDeck hidden under a module.
** *240.24 Location in or on Premises.*
** National Electrical Code 2008 Edition *(A) Accessibility.*
Overcurrent devices shall be readily accessible and shall be installed
so that the
Dave
I agree, in the case of microinverters, you already have a main PV System
disconnect at the Load Panel to shut down the system that is readily
accesible. I would consider the disconnect on the roof as a supplemental
disconnect for the purposes of maintenance by authorized personal that only
Not just microinverters. This could apply to multiple string inverters with
combined output in a suitable panel under a module. That scenario is
probably rare, but I have seen it on a commercial flat/low-pitched roof
installation.
Jason Szumlanski
On Tue, Apr 29, 2014 at 12:43 PM, Bill Hoffer
Any idea what the two silver cylinders in the upper left of the photo are
(sitting on top of the battery box)?
Hi Bill;
The 2014 NEC (coupled with rampant misinterpretation) is accelerating
an ever widening gap between those that have code and those that can't
afford it. On one side, US
I'm glad everyone is having so much fun with that pic, as scary as it
was. We could make a contest out of it: How many code violations can
you find in this picture?
and let Bill judge the answers. Believe me, there are more pictures,
where that came from.
Sorry, I do not know what those
Follow up to Bill's point.
For Micros I've installed a disconnect on the roof, but never a breaker or fuse
Why install a breaker?
jay
peltz power
On Apr 29, 2014, at 9:43 AM, Bill Hoffer wrote:
Dave
I agree, in the case of microinverters, you already have a main PV System
disconnect at
14 matches
Mail list logo
