I recently needed to combine the output of two 20kw 3-phase inverters before the PV revenue meter. Instead of investing in an expensive panel for this, I ran each inverter output to its own 30A fused outdoor disco, then combined disco outputs in the meter socket using 2-pole replacement meter lugs (Milbank #K4977). A space and money saver for sure. And there is no panel for someone to come along later and install non system-related load circuits.
Kirk Herander VT Solar, LLC Proven PV provider since 1991 www.vermontsolarnow.com dba Vermont Solar Engineering NABCEPTM Inaugural Certificant VT RE Incentive Program Partner 802.863.1202 From: RE-wrenches [mailto:[email protected]] On Behalf Of Mark Westbrock Sent: Monday, July 14, 2014 8:41 AM To: RE-wrenches Subject: Re: [RE-wrenches] Combining Multiple Inverters I agree that the exact placarding will depend on your AHJ, but you will certainly want one that says something like "This breaker panel is for combining solar inverter outputs. Do not add any additional breakers or make any circuit connections". ---- Mark Westbrock Field Manager & Employee-Owner NM EE98J Journeyman Electrician NABCEP Certified PV Installation Professional NABCEP Certified PV Technical Sales <http://positiveenergysolar.com/> Description: Image removed by sender. Positive Energy, Inc. 510 S. Main St. Las Cruces, NM 88001 office: 575-524-2030 cell: 575-640-2432 [email protected] <mailto:[email protected]> www.positiveenergysolar.com Description: Image removed by sender. <http://www.nabcep.org/installer-locator?state=NM> Description: Image removed by sender. <http://www.nabcep.org/installer-locator?state=NM> Description: Image removed by sender. <http://www.solarreviews.com/installers/positive-energy-solar/> Description: Image removed by sender. <http://www.bcorporation.net/> Description: Image removed by sender. On Fri, Jul 11, 2014 at 3:45 PM, Jason Szumlanski <[email protected]> wrote: I'd spring a few extra bucks for the QO line of panels. Better bus bar, better breakers, more common breakers (availability), etc. To answer your question, it depends on the interconnection method. Load side? Line side? Fusible disconnect or safety switch ahead of it? And some jurisdictions have their own opinion. On Thu, Jul 10, 2014 at 5:08 PM, Corey Shalanski <[email protected]> wrote: Wrenches, We have reevaluated our approach to combining multiple inverters and have settled on a SqD HOM612L100RB as a suitable solution - it is readily available from our local supply house for ~$25 and accommodates up to three full-size 2-pole breakers. What - if any - labels do you install on these panels: "AC (Solar) Combiner Panel"? 705.12(D)(4)? Other recommendations? Thanks. -- Corey Shalanski Joule Energy New Orleans, LA Description: Image removed by sender.ᐧ On Fri, Jun 27, 2014 at 12:41 PM, <[email protected]> wrote: Message: 6 Date: Fri, 27 Jun 2014 12:41:52 -0400 From: Jason Szumlanski <[email protected]> To: RE-wrenches <[email protected]> Subject: Re: [RE-wrenches] Combining Multiple Inverters Message-ID: <cajjtg3qzaxb-ugkkotupptd81ncnxv0uzid_frjfap5jo4f...@mail.gmail.com> Content-Type: text/plain; charset="utf-8" Dave, I looked at the BR24L70RP a while back. It's really a 2-space, 4 cuircuit panel. I think my conclusion was you actually need a single quadplex breaker with common trip center and outer breakers to get (2) 2-pole breaker functionality. The quadplex breakers come in a variety of mixed rating (i.e. 15A center and 20A outer breakers). They are not readily stocked and not cheap. We stuck with Sq D QO load centers for that reason. Am I missing something? Jason Szumlanski _______________________________________________ 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
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