Hi guys, Sma installation manual us-5000-8000 inverters. section 6.5, page 42. Maximum over current protection 50 amps.
Section 6.5.1, page 42 #6 wire max. Jay Peltz power > On Jun 27, 2014, at 4:53 AM, [email protected] (Richard L Ratico) > wrote: > > I may be playing devil's advocate here, but I want to add a few thoughts. > Jay, I > just looked at Fronius and SMA inverter data sheets. I found no spec. for an > output OCPD, only a spec for max. output current. > William, most inverters now come with integrated DC/AC discos. Dave, 2014 NEC > 705.12(D)(1), IMHO, specifies ONE OCPD for the entire interconnected power > system, not individual OCPD for each inverter. > > Generally speaking OCPD is provided for the circuit conductors in a system, > not > the individual pieces of equipment. If the equipment manu. specifies OCPD, > that > is a different story. > > I understand the 2014 code to require appropiate OCPD for all the conductors > from the panelboard to the inverter. If that can be accomlished with one > device > at the panel, it meets code. That said, code is a MINIMUM standard. > > Bottom line, I agree with Corey that there is no code requirement for > individual > OCPD for each inverter. If there is, unfortunately, it is insufficiently > explicit such that we are having this conversation. > > Dick Ratico > Solarwind Electric > > > --- You wrote: > I have never seen an inverter that does not specify a OCPD size. > > Jay > Peltz power. > > Sent from my iPhone > >> On Jun 26, 2014, at 3:20 PM, Dave Click <[email protected]> wrote: >> >> Corey, >> >> The line of reasoning is faulty. It's 705.12(D)(1). Micro-inverters are the > exception because they are specially listed to share a breaker. As for the > other > inverters, doubling them up on a single breaker / disconnect probably goes > against their installation instructions [110.3(B)] and it's unlikely that you > could put multiple units on a single breaker anyway because when you take (2 > inverters) x (rated current) x (1.25) you will probably come up with a minimum > breaker size that is larger than the maximum allowed under the NRTL listing to > UL 1741. >> >> Dave >> >> >> >>> On 2014/6/26, 16:18, Corey Shalanski wrote: >>> We considered the necessity to shut down individual inverters and determined > that the added costs of an inverter output combiner panel were not merited. I > agree that in theory it seems beneficial to be able to switch each inverter > individually, but how often does this occur in practice? For the relatively > infrequent cases where we need to return to a jobsite and shut down an > inverter > - for troubleshooting/removal/etc. - we do not mind shutting down the other > inverters (up to a limit) for what is hopefully a short period of time. >>> >>> Again, this whole line of reasoning may be shown to be faulty if someone can > directly point to the Code section that requires OCPD on each individual > inverter. >>> >>> -- >>> Corey >>> $E1eB >>> >>> >>>> On Thu, Jun 26, 2014 at 9:20 AM, >>>> <[email protected]> > wrote: >>>> >>>> Message: 5 >>>> Date: Wed, 25 Jun 2014 19:17:57 -0700 >>>> From: William Miller <[email protected]> >>>> To: RE-wrenches <[email protected]> >>>> Subject: Re: [RE-wrenches] Combining Multiple Inverters >>>> Message-ID: <[email protected]> >>>> Content-Type: text/plain; charset="utf-8" >>>> >>>> Not allowed. You need a dedicated OCPD. Plus seems like a really bad idea. > How do you shut down just one inverter? >>>> >>>> >>>> >>>> Miller Solar > --- end of quote --- > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/[email protected]/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > _______________________________________________ List sponsored by Redwood Alliance List Address: [email protected] Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/[email protected]/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
