Mark, Would you mind posting a link - if you have it - to the Data Bulletin on the HU361 you spoke of? I'm sure I can find it on the Sq D site if you don't
Thanks! Greg Egan > Date: Sun, 21 Jun 2009 09:22:43 -0700 > From: "Mark Frye" <ma...@berkeleysolar.com> > Subject: Re: [RE-wrenches] fronius IG Plus practical engineering > WAA??? > To: "'RE-wrenches'" <re-wrenches@lists.re-wrenches.org> > Message-ID: <a0844770fc7d484881555ef8e5537...@marksdell> > Content-Type: text/plain; charset="us-ascii" > > Bob-O, > > I noticed your comment about the HU361 and went back and reviewed the Data > Bulletin, Direct Current and Photovoltaic Systems, 08/2005. > > This confirmed my understanding that the limiting factor on the 30A switch > in a photovoltaic applications is not 30A * 0.8. The limiting factor is > 18A > per pole or 11.5A Isc per pole. > > Depending on the modules used, this may or may not preclude doubling up > strings on individual poles. > > Mark Frye > Berkeley Solar Electric Systems > 303 Redbud Way > Nevada City, CA 95959 > (530) 401-8024 > <http://www.berkeleysolar.com/> www.berkeleysolar.com > > > _____ > > From: re-wrenches-boun...@lists.re-wrenches.org > [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Bob-O > Schultze > Sent: Saturday, June 20, 2009 2:36 PM > To: RE-wrenches > Subject: Re: [RE-wrenches] fronius IG Plus practical engineering WAA??? > > > Nick, > Fronius sells a heavy copper buss bar which will link all the six inputs > together. They look sort of like the Outback PSPV bus bars except copper > and > MUCH heavier. If you need four or more inputs you'll need to get two of > them. Three or less, cut one in half. For some reason known only to > Fronius > in Austria, if Fronius US orders two of those buss bars in one packet, it > costs more than two ordered separately. Drives Gord nuts, but that's the > way > it is. I just installed a 11.4Plus recently with the buss bars and it > worked > out pretty well. I never looked to see if there were individual fuses but > it > worked right out of the box, so....? > Combining on the roof with HV touchsafe fuses and holders is still the way > to go, IMO, however if you are going to use a HU361 DC Disconnect at the > inverter with four strings, you will likely need to run down two sets of > home runs so as not to overload the poles which need to be derated from > 30A > by the usual 20%. Or, go to a 60A Disco which is probably more expensive > than a second set of wires. > Hope this helps. > Bob-O > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20090621/cf468ea2/attachment.htm> > > ------------------------------ > > _______________________________________________ > 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 > > > > End of RE-wrenches Digest, Vol 2, Issue 606 > ******************************************* > _______________________________________________ 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
