William I have a grid tie system with a Outback Radian and Xantrex 600 volt charge controller with 4kw of modules and it sells back flawlessly. I have revenue-grade monitoring on the system and I am very happy with the output. David Katz
Sent from my iPhone On Apr 16, 2012, at 6:51 AM, "William Miller" <will...@millersolar.com> wrote: > Friends: > > There has been recent discussion on this forum about PV production in > grid-tied with battery systems. I have been faced with this same problem > in a 3 XW system installed in 2009. > > The customer's power bill never went down. PV harvest was abysmal. The > system would create great short circuit current but would not harvest into > the batteries. > > It is starting to appear the XW firmware was at fault. The inverters would > charge the batteries too high so the charge controllers would back > off. Upgraded firmware seems to be helping, but the data set is still > limited. > > Remember this: just because a PV system can produce does not mean it > will. The charge controller knows only one thing: battery voltage. If it > is high, production is curtailed. > > Off-grid production will also be reduced is consumption is curtailed. > > Charge controllers that can be set for grid-tied applications help, but > only if the inverter(s) do not keep the battery voltage too high. > > William Miller > > > Miller Solar > Voice :805-438-5600 > email: will...@millersolar.com > http://millersolar.com > License No. C-10-773985 > > _______________________________________________ > 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 > _______________________________________________ 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