<div dir="ltr">Using PV and battery backup to reduce generator run time is a no-brainer, and we all are familiar with that sort of stuff. But using PV to augment a Prime Power generator is not going to work at small generator sizes for a couple of reasons. <div>1) Small generators are not built to run continually.</div><div>2) Any diesel generator will wet stack and experience problems with blow-back if ran without load. So you have to load the generator anyway.</div><div>I don't think grid tied PV can offer a serious advantage with one generator.</div><div><br></div><div>I recently did a design for a 4MW power plant using 5 x 800KW generators and 400KW of PV, and using ComAp controllers and SMA Fuel Save technology. This works because there was five generators, so the generators could be taken offline progressively as the PV came online. Include some grid storage and it all gets very interesting. You can model all of this in Sunny Design 3+. Very cool software.</div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Oct 28, 2014 at 7:35 PM, <span dir="ltr"><<a href="mailto:Jarmo.Venalainen@schneider-electric.com" target="_blank">Jarmo.Venalainen@schneider-electric.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><font face="sans-serif">Hi:</font>
<br>
<br><font face="sans-serif">Xantrex did some early work on generator
with inverter compatibility back in 2007. AC coupling PV to generators
was very new back then and we wanted to find the benefit of using a battery
based inverter to reduce the run time of generators. One system was
a small 5kW off-grid house and the second a 90kW generator running a couple
of dozen homes. For the trial is set up with power monitoring for
back-feed and much more.</font>
<br>
<br><font face="sans-serif">The systems are still running. Here
are a few training slides which summarize the results and a link to the
archived study from 2007 at the Natural Resources Canada.</font>
<br>
<br>
<br>
<br><a href="http://www.nrcan.gc.ca/energy/publications/sciences-technology/renewable/solar-photovoltaic/6215" target="_blank"><font color="blue" face="sans-serif">http://www.nrcan.gc.ca/energy/publications/sciences-technology/renewable/solar-photovoltaic/6215</font></a>
<br>
<br><font face="sans-serif">The bullet form summary is:</font>
<br>
<br><font face="sans-serif">- The smaller the generator, the large
the savings whether you grid tie to the generator or use a battery based
inverter to reduce generator run time. </font>
<br><font face="sans-serif">- PV is not needed to get the bulk of
the savings in systems using battery based inverters to reduce run time
of small generators.</font>
<br>
<br><font face="sans-serif">JARMO</font>
<br><div><div class="h5">
<br>
<br><font size="3">On Oct 28, 2014 4:48 AM, "Corey Shalanski" <</font><a href="mailto:cshalanski@joule-energy.com" target="_blank"><font size="3" color="blue"><u>cshalanski@joule-energy.com</u></font></a><font size="3">>
wrote:</font>
<br><font size="3">Wrenches,</font>
<br>
<br><font size="3">We frequently encounter residences with backup generators.
The question that arises: how should the PV system be interconnected?</font>
<br>
<br><font size="3">I have searched the archives and found some good information
about this subject, but nothing definitive. I have fallen into the habit
of broadly proclaiming that the PV system *must* be interconnected on the
"utility" side of the transfer switch - in order to prevent backfeeding
into the generator and thereby eliminate unintentional equipment damage.
Is this concern justified? If so, should this be an absolute rule or would
it depend on the generator make/model?</font>
<br>
<br><font size="3">Thanks for any insights.</font>
<br>
<br><font size="3">--</font>
<br><font size="3">Corey Shalanski</font>
<br><font size="3">Joule Energy</font>
<br><font size="3">New Orleans, LA</font>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div dir="ltr">Chris Mason<div><div style="color:rgb(136,136,136)"><span style="font-size:13px">NABCEP Certified Solar PV Installer™</span></div><div style="color:rgb(136,136,136)"><span style="color:rgb(34,34,34)">Solar Design Engineer</span></div><div style="color:rgb(136,136,136)"><span style="font-size:13px">Generac Generators Industrial technician</span></div></div><div style="color:rgb(136,136,136)"><span style="font-size:13px"><br></span></div><div><a href="http://www.cometenergysystems.com" target="_blank">www.cometsolar.com</a></div><div>264.235.5670</div><div>869.662.5670</div><div>Skype: netconcepts</div></div>
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