William, The SMA6000 @ 240V has an AC output rating of 25A. 4 times 25 times 1.25 equals 125 A. If the solar accumulation panel is a dedicated load center, then the load center, feeder and feeder breaker need only be rated to 125 A. If the dedicated load center is located in the same building as the service, then the dedicated load center can be main lug without main breaker. If the dedicated load center is located on a buidling remote from the the service, then it will need a main breaker rated at 125A.
Mark Frye Berkeley Solar Electric Systems 303 Redbud Way Nevada City, CA 95959 (530) 401-8024 www.berkeleysolar.com -----Original Message----- From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of William Miller Sent: Sunday, January 22, 2012 10:20 AM To: RE-wrenches Subject: Re: [RE-wrenches] Paralleling Multiple Inverter Rich: Here is the first consideration you might want to make: You state a value of 100 Amps for this system, which I assume is the maximum AC output at 240 VAC (25 Amps) times four inverters. The value of 25 amps per inverter is irrelevant to your design, however. You must take the 25 amps times 1.25 (for continuous duty) which means your required breaker is 40 amps (unless you can find 35 amps breakers). 40 Amps is the relevant value. 40 times 4 equals 160 amps. Therefore, for purposes of 690.64(B) calculations, you have a 160 amp system. Others on this list will no doubt provide advise on how to deal with that 160 amps. William Miller _______________________________________________ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options & 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
