Dan. Great thoughts on the subject. I agree with the power shed idea but this isn't feasible most of the time for me. I have been thinking about AC coupling for off grid systems and the idea doesn't excite me. Thanks for your input.
Aaron Aaron Mandelkorn Owner/Solar Specialist Renewable Energy Outfitters 719-221-5249 970-596-3744 www.reosolar.com reoso...@gmail.com > On Apr 19, 2014, at 11:22 AM, Dan Fink <danbo...@gmail.com> wrote: > > Hi Aaron, boB, Wrenches; > > I think Aaron brings up a good point, and it's certainly confusing to me. > > The boldface type heading of 690.12 is "Rapid Shutdown of PV Systems on > Buildings" > > The body of the 690.12 text begins with "PV system *circuits* installed on or > in buildings shall....." > > 690.2 defines "Photovoltaic source circuit" as "Circuits between modules and > from modules to the common connection point(s) of the DC system" > > and "Photovoltaic output circuit" as "Circuit conductors between the PV > source circuit(s) and the inverter or DC utilization equipment." > > "PV system" from the heading of 690.12 is not defined in 690.2, other than > that the definition of "Photovoltaic system voltage" specifically includes > both PV output and source circuits. > > To me the confusing part of 690.12 is "PV Systems on Buildings" is that > "system" is not defined, and tends to imply rooftop arrays. But "PV system > circuits installed on or in buildings shall....." is pretty clear. I > interpret it to mean anything DC and PV stuck to the side of building like > conduit, etc, or running inside....which means it applies to ground-mount > arrays too if they terminate outside or inside the building. > > What I'm seeing as the easy work-around for us off-grid folk is the old > "power shed" idea containing battery bank, balance of system, inverter > etc....just build it within 10 feet of the PV array and you're fine. > > Any thoughts? > > > Dan Fink, > Executive Director; > Otherpower > Buckville Energy Consulting > Buckville Publications LLC > NABCEP / IREC accredited Continuing Education Providers > 970.672.4342 > > > > >> On Fri, Apr 18, 2014 at 3:30 PM, b...@midnitesolar.com >> <b...@midnitesolar.com> wrote: >> >> Bill Brooks should probably respond to this also, but reading the NEC, it >> looks like if the wires >> do not go inside the building to run more than 5 feet (as the crow flies), >> the the rapid disconnect >> does not apply. OR, less than 10 feet from the array IF the PV is mounted >> on that building. >> >> boB >> >> >> >> >>> On 4/18/2014 1:34 PM, Aaron Mandelkorn wrote: >>> The rapid shutdown language is so confusing. When looking at the rapid >>> shutdown language, does PV systems "on" a building refer to only situations >>> where the array is on a building; or does it include DC conductors as well. >>> For example, if the DC conductors from a pole mounted array run up the side >>> of a building before punching in to the inverter, does this require rapid >>> shutdown? Is this PV system considered "on" a building? >>> >>> Aaron >>> >>> Aaron Mandelkorn >>> Owner/Solar Specialist >>> Renewable Energy Outfitters >>> 719-221-5249 >>> 970-596-3744 >>> www.reosolar.com >>> reoso...@gmail.com >>> >>> >> >> _______________________________________________ >> List sponsored by Home Power magazine >> >> List Address: RE-wrenches@lists.re-wrenches.org >> >> Change email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> List-Archive: >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> >> List rules & etiquette: >> www.re-wrenches.org/etiquette.htm >> >> Check out participant bios: >> www.members.re-wrenches.org >> > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Change email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org >
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