Pekka, Does the 800A main panel have a main 800A breaker? If not, then couldn't you install a 175A breaker? 800 x 1.2 = 960A - (main breaker size) = Allowed PV breaker size.
We did a design for a project in Hawaii recently were we connected to a 208Y/120V 800A main panel with a 350A PV breaker. -- John Stimac | Corvallis, OR Renewable Energy Associates LLC 541-754-2001 Office/Fax j...@renewableassociates.com www.renewableassociates.com -----Original Message----- From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Pekka Laine Sent: Monday, June 17, 2013 10:34 To: re-wrenches@lists.re-wrenches.org Subject: [RE-wrenches] Feeding 160A 3PH to a 800A/800A Main Service 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 _______________________________________________ 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
