<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">I agree Blake - you have to check the specs and consult the mfg. The same is true with combiners, some are rated for continuous duty/full load, and some are not. Lots of large systems out there with 200A combiners connected to 250A OCPDs (and 250A conductors, but that\u2019s another story...). <br><br><div id="AppleMailSignature" dir="ltr">Brian</div><div dir="ltr"><br>On Aug 21, 2019, at 5:20 PM, Blake Gleason <<a href="mailto:blake@sunlightandpower.com">blake@sunlightandpower.com</a>> wrote:<br><br></div><blockquote type="cite"><div dir="ltr"><div dir="ltr">Typically a fused disconnect can only handle 80% of it's nominal current on a continuous basis. Unfused disconnects are often 100% rated. For example, see attached Square D bulletin #3110DB0401R0410.<div><br></div><div>So, a 100% rated (unfused) 30A disconnect (at least, from Square D) should be fine here, as long as your OCPD is provided elsewhere (eg, the breaker you mentioned). </div><div><br></div><div>NEC 690.8(B)(1)(Exception) explicitly allows a 100%-rated device to be used without multiplying the inverter output current by 125%.</div><div><div><br></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Aug 21, 2019 at 3:22 PM Greg <<a href="mailto:greg@remotepowerinc.com">greg@remotepowerinc.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div bgcolor="#FFFFFF">
Fellow Wrenches, I'm having a discussion with a utility engineer
regarding the following situation:<br>
<br>
Installing a 6kW inverter that has a full rated output of 25 amps.
80% of 30 is 24. That means to me I need to go up to a 40 amp
breaker. I'm running #8 (continuous load 25 x 1.25 etc.) <br>
The engineer believes I should use a 60 amp disco since it's on a 40
amp breaker. My thinking is I can use a 30 amp disco since it can
not produce more than 25 amps ever. <br>
<br>
Do any of you have a reference that shows what I'm doing is okay?
Not okay? <br>
<br>
Thanks again, <br>
Greg Egan<br>
Remote Power Inc. <br>
</div>
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</div></blockquote><blockquote type="cite"><div dir="ltr"><Square-D-Switch-PV-Bulletin_06-10_100percent_rated.pdf></div></blockquote><blockquote type="cite"><div dir="ltr"><span>_______________________________________________</span><br><span>List sponsored by Redwood Alliance</span><br><span></span><br><span>List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a></span><br><span></span><br><span>Change listserver email address & settings:</span><br><span><a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a></span><br><span></span><br><span>List-Archive: <a href="http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html">http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html</a></span><br><span></span><br><span>List rules & etiquette:</span><br><span><a href="http://www.re-wrenches.org/etiquette.htm">www.re-wrenches.org/etiquette.htm</a></span><br><span></span><br><span>Check out or update participant bios:</span><br><span><a href="http://www.members.re-wrenches.org">www.members.re-wrenches.org</a></span><br><span></span><br></div></blockquote></body></html>