<html><head><base href="x-msg://21/"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hi Nick,<div><br></div><div>The usual answer is this is a bad idea for the generator.</div><div>The only exceptions I know of are if the solar is a small percentage of the generator size, then its "probably" OK on the generator.</div><div><br></div><div><br></div><div>jay </div><div>peltz power</div><div><br></div><div><br></div><div><br></div><div><div><div>On Feb 15, 2010, at 7:27 AM, Nick Soleil wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font-family: arial, helvetica, sans-serif; font-size: 12pt; ">I have a couple of projects coming up, which will require additional work to prevent connecting to a Generac Guardian's ATS panels. Do the same concerns still exist regarding back-feeding an inverter to a generator panel? Can the inverter damage the generator? I know this was the cases, at least theoretically. Should I continue to be concerned?<br><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "> </div>Nick Soleil<br>Project Manager<br>Advanced Alternative Energy Solutions, LLC<br>PO Box 657<br>Petaluma, CA 94953<br>Cell: 707-321-2937<br>Office: 707-789-9537<br>Fax: 707-769-9037<div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font-family: arial, helvetica, sans-serif; font-size: 12pt; "><br><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font-family: arial, helvetica, sans-serif; font-size: 10pt; "><font size="2" face="Tahoma"><hr size="1"><b><span style="font-weight: bold; ">From:</span></b><span class="Apple-converted-space"> </span>Darryl Thayer <<a href="mailto:daryl_solar@yahoo.com">daryl_solar@yahoo.com</a>><br><b><span style="font-weight: bold; ">To:</span></b><span class="Apple-converted-space"> </span>RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a>><br><b><span style="font-weight: bold; ">Sent:</span></b><span class="Apple-converted-space"> </span>Sat, February 13, 2010 5:51:33 PM<br><b><span style="font-weight: bold; ">Subject:</span></b><span class="Apple-converted-space"> </span>Re: [RE-wrenches] anti islanding?<br></font><br>Hi August<br>I felt I was a little to cryptic in my answer, so here is a longer answer.<br><br><br>The inverter always tries to increase the frequency if it is connected to a grid, it could never speed up all those billions of tons of rotating equipment, so the frequency stays the same. If two inverters see themselves they will both try to increase the frequency, they will succeed and if the frequency is greater than the 60.5 HZ the inverter shuts off. If there is a load that can stabilize frequency such as a synchronous motor they will either speed up the motor or they will not be able and the motor will slow down. Either way the frequency changes and the inverter shuts down for frequency out of specification which is <60.5 or >59.3 else the inverter shuts down. <span class="Apple-converted-space"> </span><br><br>The inverter also looks at a voltage, and to sell power it wants to raise voltage, necessary to put power into the grid. Unless the load exactly matches the inverter power the voltage will rise or fall if the load is to large and it will fall out of voltage specification shutting the inverter down. <span class="Apple-converted-space"> </span><br><br>One Last feature, the inverter is voltage commutated, and it looks for voltage to add its power to. if you had purely a resistive load, both inverters would wait for the voltage from the other inverter, and nothing would get done. <span class="Apple-converted-space"> </span><br><br><br><br>Think of it this way, for the system to last for 10 seconds, the speed of this strange device (synchronus motor) cannot change speed more than 0.5% per 10 second and it would coast for 30 minutes before stopping, and this motor would have to be doing no work.<span class="Apple-converted-space"> </span><br><br>--- On Sat, 2/13/10, August Goers <<a ymailto="mailto:august@luminalt.com" href="mailto:august@luminalt.com">august@luminalt.com</a>> wrote:<br><br>> From: August Goers <<a ymailto="mailto:august@luminalt.com" href="mailto:august@luminalt.com">august@luminalt.com</a>><br>> Subject: [RE-wrenches] anti islanding?<br>> To: "RE-wrenches" <<a ymailto="mailto:re-wrenches@lists.re-wrenches.org" href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a>><br>> Date: Saturday, February 13, 2010, 10:29 AM<br>> Hi Wrenches,<br>><span class="Apple-converted-space"> </span><br>> Does anyone know where I can go to read about general<br>> information on how grid tied inver anti islanding works? I'd<br>> like to be able to describe this in better detail to our<br>> tech-savvy clients.<span class="Apple-converted-space"> </span><br>><span class="Apple-converted-space"> </span><br>> Thanks,<br>><span class="Apple-converted-space"> </span><br>> August<br>><span class="Apple-converted-space"> </span><br>><span class="Apple-converted-space"> </span><br>> August Goers<br>><span class="Apple-converted-space"> </span><br>> Luminalt Energy Corporation<br>> O: 415.564.7652<br>> M: 415.559.1525<br>> F: 650.244.9167<br>><span class="Apple-converted-space"> </span><a target="_blank" href="http://www.luminalt.com">www.luminalt.com</a><br>> _______________________________________________<br>> List sponsored by Home Power magazine<br>><span class="Apple-converted-space"> </span><br>> List Address:<span class="Apple-converted-space"> </span><a ymailto="mailto:RE-wrenches@lists.re-wrenches.org" href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a><br>><span class="Apple-converted-space"> </span><br>> Options & settings:<br><span>><span class="Apple-converted-space"> </span><a target="_blank" 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></span><br>><span class="Apple-converted-space"> </span><br><span>> List-Archive:<span class="Apple-converted-space"> </span><a target="_blank" href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a></span><br>><span class="Apple-converted-space"> </span><br>> List rules & etiquette:<br>><span class="Apple-converted-space"> </span><a target="_blank" href="http://www.re-wrenches.org/etiquette.htm">www.re-wrenches.org/etiquette.htm</a><br>><span class="Apple-converted-space"> </span><br>> Check out participant bios:<br>><span class="Apple-converted-space"> </span><a target="_blank" href="http://www.members.re-wrenches.org">www.members.re-wrenches.org</a><br>><span class="Apple-converted-space"> </span><br>><span class="Apple-converted-space"> </span><br><br><br> <span class="Apple-converted-space"> </span><br>_______________________________________________<br>List sponsored by Home Power magazine<br><br>List Address:<span class="Apple-converted-space"> </span><a ymailto="mailto:RE-wrenches@lists.re-wrenches.org" 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" target="_blank">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br><br>List-Archive:<span class="Apple-converted-space"> </span><a href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org" target="_blank">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a><br><br>List rules & etiquette:<br><a href="http://www.re-wrenches.org/etiquette.htm">www.re-wrenches.org/etiquette.htm</a><br><br>Check out participant bios:<br><span><a target="_blank" href="http://www.members.re-wrenches.org">www.members.re-wrenches.org</a></span><br><br></div></div></div><br>_______________________________________________<br>List sponsored by Home Power magazine<br><br>List Address:<span class="Apple-converted-space"> </span><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:<span class="Apple-converted-space"> </span><a href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a><br><br>List rules & etiquette:<br><a href="http://www.re-wrenches.org/etiquette.htm">www.re-wrenches.org/etiquette.htm</a><br><br>Check out participant bios:<br><a href="http://www.members.re-wrenches.org">www.members.re-wrenches.org</a><br><br></div></span></blockquote></div><br></div></body></html>