Hi Brian, Can we not invoke Art. 220.5(B) Fractions of an Ampere to round down to a 30A OCPD in this case?
I suppose that .1 could be pretty significant when combining many of these inverters. Garrison Riegel Solar Service Inc On Aug 31, 2016, at 11:24 PM, Brian Mehalic <br...@solarenergy.org<mailto:br...@solarenergy.org>> wrote: Hey Wrenches- Just a heads up on the SMA Tripower - I like the inverter, but you gotta read the install manual! Spec sheet says 24 A continuous output current for the 20 kW Tripower. Install manual (and tech support) says 24.1. That extra .1 A takes you from a 30 A to a 35 A breaker. Of course you should follow the install manual not the specs. But what about the label on the side of the inverter? Well I've seen more than a handful that are labeled with a flat-out 24 Aac output current. What's an installer or inspector to do besides hope mfg's can get their numbers in order? Upon closer examination, most of the STPs are 0.1 A higher than their spec sheet per the install manual - it doesn't really make a difference on the 12 or 15 kW models - just the 20 where you have to go up 1 standard OCPD size. Pretty sure there's lots of 20 kW units out there backfeeding a 30 A breaker. Hmmmmm.... Brian Mehalic NABCEP Certified Solar PV Installation Professional(tm) R031508-59 520.204.6639 Solar Energy International http://www.solarenergy.org SEI Professional Services http://www.seisolarpros.com _______________________________________________ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org<mailto:RE-wrenches@lists.re-wrenches.org> Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm<http://www.re-wrenches.org/etiquette.htm> Check out or update participant bios: www.members.re-wrenches.org<http://www.members.re-wrenches.org>
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