Wrenches,
We frequently encounter residences with backup generators. The question
that arises: how should the PV system be interconnected?
I have searched the archives and found some good information about this
subject, but nothing definitive. I have fallen into the habit of broadly
proclaiming
We make it a rule simple and safe. We have 3 to 500 k gen-sets and its all
the same
On Oct 28, 2014 4:48 AM, Corey Shalanski cshalan...@joule-energy.com
wrote:
Wrenches,
We frequently encounter residences with backup generators. The question
that arises: how should the PV system be
I always connect to the utility side of the transfer switch. Since the transfer
switch is a listed electrical enclosure it is the best option I have used.
Aaron
Aaron Mandelkorn
Owner/Solar Specialist
Renewable Energy Outfitters
719-221-5249
970-596-3744
www.reosolar.com
reoso...@gmail.com
We also go to the utility side as a rule.
We have only one exception. A 60kW Solectria inverter is tied into a
building system that is supported by a 1 MW generator. It's a university
heating plant where it was clearly shown the base load was far larger than
the 60kw solar PV system, even when
Interconnecting the inverter output to the utility side of the transfer switch
is not necessarily an absolute rule. A knowledgeable solar EE told me a few
years back, that interconnection can be made on the load side if the inverter
kW output is small compared to the generator kW, that large kW
We run into this a lot in the Caribbean. Our general rule is that it
depends on the load. If it is a constant commercial load and the PV is
about half of the load, no issue. But for residential and where PV exceeds
the lowest load, we prefer to be on the utility side of the ATS or use a
contactor
The inverter to generator ratio is entirely the designer's call and
comes into play for large generators (for residential systems as
mentioned in earlier replies, it's a bad idea).
Interconnecting in spot networks in dense urban areas has a similar
issue in that the distribution system can't
Hi,
I'm on a jobsite without my code book. Could someone tell me where in the code
ungrounded systems do not require the inverter GEC? Basically my onsite
electrician doesn't believe me. Thanks.
Kirk Herander
VSE
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690.41 specifies the system grounding requirements for PV systems and
includes an exception if the system complies with 690.35 Ungrounded
Photovoltaic Power Systems.
--
John Stimac | Corvallis, OR
Renewable Energy Associates LLC
541-754-2001 Office/Fax
j...@renewableassociates.com
Kirk:
A DC grounding electrode conductor (GEC) is not required for inverters
that do NOT have a ground reference for the PV+ and PV- conductor(s)
from the PV array.
A GEC is not required if the string inverter is one of the new TL
(transformerless) types. Also, this applies to
If you are on 2014:
690.47(B)
An ac equipment grounding system shall be permitted
to be used for equipment grounding of inverters and other
equipment *and for the ground-fault detection reference for *
*ungrounded PV systems.*
and 690.47(C)(3)
*For ungrounded systems, this con**ductor shall
Hi Wrenches,
We've been using the Pathfinder along with the Pathfinder Assistant
software for several years and mostly like it. My concern with it is
there's no way to combine two or three shading images to account for a
string of modules spanning those different shading conditions. I've spoken
I've not done a side by side comparison, but the Pathfinder seems to be
slightly conservative, especially depending on which latitude sheet you
are using. I sometimes switch sheets and try both, when the latitude is
close to falling between (ie 37 deg, and there is 37 to 43 sheet or a 31
to
Dana,
I'm not going to answer your question directly, but rather I'd
like to add to Ray's comments. In short. use the SunEye for grid
tie work; use the Pathfinder for off grid. If you don't do off
grid (most installers don't any more, if they ever did) don't
Hello Wrenches,
A client wants to use a passive battery venting method with a heat
exchanger to the outside for his bank of Full River AGM batteries.
Below is a link to one site that recommends this method. Has anyone
used this method?
Admittedly I only partially understand your scenario, but I have found that
multiple points of interconnection to a single service are not problematic
as long as the rules of 690.64 (NEC 2008) are followed. We have done supply
side and load side connections on the same service - which sometimes
I agree with Dave - spring for the AC combiner. If you market is so
competitive that $75 makes a difference, move to Florida... on second
thought... :)
Jason Szumlanski
On Fri, Oct 24, 2014 at 1:39 PM, Dave Click davecl...@fsec.ucf.edu wrote:
Bill, typically inverters have a max OCPD that can
I have used hi low vents on the same exterior wall with no issues and we
have used the firewall through wall terminals there we a pvc box and
connect the pipe to that. Every part has a price and it all adds up
On Oct 28, 2014 12:54 PM, Drake drake.chamber...@redwoodalliance.org
wrote:
Hello
That's an interesting idea, but all the failed designs they illustrate
don't show the way we usually do it. We don't even bother with an
inlet, as most battery boxes have enough gap around the door to provide
intake air, then the exhaust comes off the top with several feet of rise
to prevent
We do what we can to seal the enclosure so if or when a battery fails and
really gasses off the two vents on the same wall regardless of wind
direction will vent the gas. If it is not sealed then the gas can travel
through out the area this is not advised.
On Oct 28, 2014 4:06 PM, Ray Walters
I do agree steel and copper/brass is to expensive for the possible return.
On Oct 28, 2014 4:10 PM, Jerry Shafer jerrysgarag...@gmail.com wrote:
We do what we can to seal the enclosure so if or when a battery fails and
really gasses off the two vents on the same wall regardless of wind
That's why we usually have the batteries in a garage, basement, or out
building that is not open to the living space.
I've seen some cases of very well sealed and insulated enclosures
allowing batteries to over heat, and also build up a lot of acid damaged
connections.
Boxes I've seen with more
Dana:
You can evaluate multiple points with a Pathfinder, thusly:
1.In case you were not aware, the little numbers in between the hours add
up to 100% over a day.
2.Create a spreadsheet with all of the numbers present. Make it mimic the
layout on the Pathfinder.
3.For any
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