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Pekka,
I believe that the 120% rule is only for residential application. Unless it's changed (and I don't do commercial any more, so I may be all wet here) you're limited to 100% on commercial applications. The assumption is that a commercial service may already be running at or close to full ampacity, while residential is unlikely ever to do so. Allan Allan Sindelar
Dear Fellow Wrenches, We have a small 50kW 120/208V commercial job with five 9kW 3PH inverters, each outputting max. 25A. We are landing those into a dedicated load center with five 40A breakers. Doing the math, 5 x 25A x 1.25 = 156.25A, we would need a 160A breaker. This also equals to the maximum we can backfeed into a 800A/800A Main Service on the load side according to the "120%" rule.The problem now is that we cannot locate any kind of 160A breaker or even a 160A fuse for a AC disconnect. Has anybody ever done this without doing a "line-side tap?" It is hard to believe that there wouldn't be an existing solution to landing maximum PV into a 800A service. Are we missing something? Any good ideas or comments would be appreciated. Sincerely, Pekka Laine President Photon Solar Power Inc. www.PhotonSolarPower.com Cell. 760-556-8170 Toll Free 888-SUN-ACDC CA Lic. #933648 NABCEP Certified PV Installer # 032611-174 _______________________________________________ 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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