David,
What did you choose for revenue-grade monitoring?
Comments?
Bill Loesch
Solar 1 - Saint Louis Solar
314 631 1094
On 18-Apr-12 4:01 AM, David Katz wrote:
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
-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2012.0.1913 / Virus Database: 2411/4943 - Release Date: 04/17/12
_______________________________________________
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
