<font face="arial" size="4"><p style="margin:0;padding:0;">im curious david, <span style="font-size: 14pt;">how you measure the output</span><span style="font-size: 14pt;"> </span><span style="font-size: 14pt;">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?</span></p>
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<p style="margin:0;padding:0;">thanks,</p>
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<p style="margin:0;padding:0;">todd</p>
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<p style="margin:0;padding:0;">On Wednesday, April 18, 2012 2:01am, "David Katz" <dkatz@aeesolar.com> said:<br /><br /></p>
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<p style="margin:0;padding:0;">> William<br />> I have a grid tie system with a Outback Radian and Xantrex 600 volt charge<br />> controller with 4kw of modules and it sells back flawlessly. I have revenue-grade<br />> monitoring on the system and I am very happy with the output.<br />> David Katz<br />> <br />> Sent from my iPhone<br />> <br />> On Apr 16, 2012, at 6:51 AM, "William Miller" <william@millersolar.com><br />> wrote:<br />> <br />> > Friends:<br />> ><br />> > There has been recent discussion on this forum about PV production in<br />> > grid-tied with battery systems. I have been faced with this same problem<br />> > in a 3 XW system installed in 2009.<br />> ><br />> > The customer's power bill never went down. PV harvest was abysmal. The<br />> > system would create great short circuit current but would not harvest into<br />> > the batteries.<br />> ><br />> > It is starting to appear the XW firmware was at fault. The inverters would<br />> > charge the batteries too high so the charge controllers would back<br />> > off. Upgraded firmware seems to be helping, but the data set is still<br />> limited.<br />> ><br />> > Remember this: just because a PV system can produce does not mean it<br />> > will. The charge controller knows only one thing: battery voltage. If it<br />> > is high, production is curtailed.<br />> ><br />> > Off-grid production will also be reduced is consumption is curtailed.<br />> ><br />> > Charge controllers that can be set for grid-tied applications help, but<br />> > only if the inverter(s) do not keep the battery voltage too high.<br />> ><br />> > William Miller<br />> ><br />> ><br />> > Miller Solar<br />> > Voice :805-438-5600<br />> > email: william@millersolar.com<br />> > http://millersolar.com<br />> > License No. C-10-773985<br />> ><br />> > _______________________________________________<br />> > List sponsored by Home Power magazine<br />> ><br />> > List Address: RE-wrenches@lists.re-wrenches.org<br />> ><br />> > Options & settings:<br />> > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org<br />> ><br />> > List-Archive:<br />> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org<br />> ><br />> > List rules & etiquette:<br />> > www.re-wrenches.org/etiquette.htm<br />> ><br />> > Check out participant bios:<br />> > www.members.re-wrenches.org<br />> ><br />> _______________________________________________<br />> List sponsored by Home Power magazine<br />> <br />> List Address: RE-wrenches@lists.re-wrenches.org<br />> <br />> Options & settings:<br />> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org<br />> <br />> List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org<br />> <br />> List rules & etiquette:<br />> www.re-wrenches.org/etiquette.htm<br />> <br />> Check out participant bios:<br />> www.members.re-wrenches.org<br />> <br />></p>
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