Thanks for the input, Daryl~ For now the prospect is considering sufficient power for a big energy hog home plus outbuildings. They'll probably get over that soon once the sticker shock sinks in. You asked, "how big a battery bank and how big a generator?" Mick replies: the whole hog system would need...guessing...about 500 kilowatt-hours of storage (~14,000 amp hours at 48 volts), 70kW worth of inverter/charger, plus a lot of PV. A 48 volt generator seems not best because that would involve over 1,000 amps coming off the machine. Maybe multiple DC generators would be worth consideration. I see why you are pointing in that direction, Daryl, because if not for the generator problem the Outback GT system can go large.
Finding a 48 volt generator line with proper end of charge regulation is another challenge. Can any List member provide feedback on the Canadian mfr, Mechron? Much appreciated, Mick Abraham, Proprietor www.abrahamsolar.com Voice: 970-731-4675 On Sat, Aug 7, 2010 at 11:19 AM, Darryl Thayer <daryl_so...@yahoo.com>wrote: > I have a functioning Outback system of 12 inverters, the original design > was for 15 inverters. My system can sell up to 40 kW to the grid and I have > seen pictures of systems up to 25 inverters. How big a battery bank and how > big a generator? Realistically you may not want to charge over C/10 Have > you considered a 48 volt generator? > > Daryl > > --- On *Fri, 8/6/10, Mick Abraham <m...@abrahamsolar.com>* wrote: > > > From: Mick Abraham <m...@abrahamsolar.com> > Subject: [RE-wrenches] Advice needed on upsizing a battery & grid > interactive inverter stack > To: "RE-wrenches" <re-wrenches@lists.re-wrenches.org> > Date: Friday, August 6, 2010, 6:17 PM > > > Yo, Mechanics~ > > A client is considering a "biggest ever for me" battery based power system. > They will probably scale down their ambitions once the cost realities settle > in but for now they've asked me to look for battery based inverter systems > which can scale bigger than a triple stack of Xantrex XW6048 inverters. Your > advice would be welcomed. > > * The system must be split phase 120/240, not 3 phase. > > * Outback seems "out" because the inverter group should handle backup > battery recharge using grid or generator AC...and we also want to sell > excess PV power to the grid. > > * No cobbled together AC coupled systems would be considered without a > convincing way to feather the end of charge on the battery when the grid is > down...float & all. I don't want to go back to the days of clunky, coarse > battery "end of charge" care. > > * Sunny Island/Sunny Boy is in contention but I'm not keen on having to > stack in pairs to maintain the 120/240 three wire architecture. A single > Sunny Island failure would take down two of the yellow boxes. What is the > limit on stack-ability for Sunny Island? > > * A battery sales rep suggested Satcon brand but I think that's bogus > advice. Satcon is pure grid intertie only, right? > > *********************************************** > > So...there is your challenge de la semaine (challenge of the week). Who > builds an inverter system with Xantrex XW-like features only bigger...much > bigger? OR: who could supply the "Mother of Sunny Island/Sunny Boy" > system? Replies would be welcomed on the List or off. > > The Wrench List is the Bomb! > > Mick Abraham, Proprietor > www.abrahamsolar.com > > Voice: 970-731-4675 > > -----Inline Attachment Follows----- > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: > RE-wrenches@lists.re-wrenches.org<http://mc/compose?to=re-wrenc...@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 > > > > _______________________________________________ > 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 > > >
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