<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hi Kelly<div><br></div><div>It is an interesting issue and was just dicussing this the other day.</div><div><br></div><div>I think what happens if the inverter backfeeds the genny, the generator voltage will go up, if it goes up enough, it will go outside the window of the inverter and the inverter will drop out, voltage will them return to normal, inverter will reconnect and repeat.</div><div><br></div><div>But I sure wouldn't want to fix the generator. A relay powered from the grid will take care of the problem.</div><div><br></div><div>jay</div><div><br></div><div>peltz power</div><div><div><div>On Nov 19, 2008, at 5:24 PM, Kelly Keilwitz, Whidbey Sun & Wind wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div> <font face="Monaco, Courier New"><span style="font-size:12pt">Wrenches,<br> I'm dredging up this subject again (previous postings 6/08) with a simple question that doesn't seem to have been answered:<br> <br> Is there any issue connecting a batteryless grid-tie PV system to the load side of a panel that is backed-up by a generator on an automatic transfer switch, when the grid is down and the generator running?<br> <br> In this case the PV is 5.7kW, the inverter an SMA 6000, the generator unknown size/type, but propane, automatic start, and backing up the entire main panel.<br> <br> SMA tech support first said it's OK, then that the generator will blow up. I can imagine, if the inverter tries to sync with the inverter, that the voltage could rise, causing the inverter to disconnect, wait 5 minutes, repeat. Is there anything nasty that could happen? <br> <br> Thanks,<br> -Kelly<br> <br> <br> Kelly Keilwitz, P.E.<br> Whidbey Sun & Wind, LLC<br> Renewable Energy Systems<br> NABCEP Certified PV Installer<br> 987 Wanamaker Rd, <br> Coupeville, WA 98239 <br> PH & FAX 360-678-7131<br> <font color="#0000FF"><u><a href="sunwind@whidbeysunwind.com">sunwind@whidbeysunwind.com</a><br> </u></font> <br> </span></font><span style="font-size:12pt"><font face="Verdana, Helvetica, Arial"><br> </font><font face="Monaco, Courier New"><br> </font></span><font face="Arial"><span style="font-size:11pt"><br> </span></font><font size="1"><font face="Verdana, Helvetica, Arial"><span style="font-size:9pt"> <br> </span></font></font><font face="Verdana, Helvetica, Arial"><span style="font-size:12pt"><br> </span></font> </div> _______________________________________________<br>List sponsored by Home Power magazine<br><br>List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a><br><br>Options & settings:<br><a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><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></blockquote></div><br></div></body></html>