[RE-wrenches] PV harvest in grid-tied systems
David Katz
dkatz at aeesolar.com
Wed Apr 18 02:01:08 PDT 2012
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" <william at 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: william at millersolar.com
> http://millersolar.com
> License No. C-10-773985
>
> _______________________________________________
> List sponsored by Home Power magazine
>
> List Address: RE-wrenches at 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
>
More information about the RE-wrenches
mailing list