im curious david, how you measure the output of the radian since the system is grid tie/w battery backup. the only way i have seen to do this is with a kv2c meter on each 120 volt leg. is that how you are monitoring the output of the inverter? thanks, todd On Wednesday, April 18, 2012 2:01am, "David Katz" <[email protected]> said:
> 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" <[email protected]> > 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: [email protected] > > http://millersolar.com > > License No. C-10-773985 > > > > _______________________________________________ > > List sponsored by Home Power magazine > > > > List Address: [email protected] > > > > 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: [email protected] > > 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 > > Sent from Finest Planet WebMail.
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