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<p class=MsoPlainText>Hi Drake, Geoff,<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>We did a test installation in northern British Columbia
with 28kW of PV and GT5 inverters selling to a 90kW Genny system in a remote off-grid
community. So far we have just stuck to the normal 1741 islanding settings, and
the system has been working smoothly. The PV was basically sized so that it
would not exceed the lowest mid-day load on the small grid, and there was
already an automatic dump load in the system to ensure the diesels never became
completely unloaded.<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>So far the system has been working very well, with good
fuel saving for the community. You can read more about it here.<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText><a href="http://nemiahpower.blogspot.com/">http://nemiahpower.blogspot.com/</a><o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>Cheers,<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>Mark<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Mark Edmunds, P.Eng.</span><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'><br>
</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Director
Engineering</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'>
<br>
</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Residential
Renewable Energy Markets</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'>
<br>
</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Xantrex
Technology Inc.</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'>
<o:p></o:p></span></p>
<p class=MsoNormal><br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>E-mail:
mark.edmunds@xantrex.com</span> <br>
<span lang=EN-CA style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>Website:</span><u><span lang=EN-CA> </span></u><a
href="http://www.xantrex.com"><span lang=EN-CA style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:blue'>www.xantrex.com</span></a> <br>
<br>
<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>-----Original Message-----<br>
From: re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org] On Behalf Of Drake
Chamberlin<br>
Sent: Thursday, March 12, 2009 7:40 PM<br>
To: RE-wrenches<br>
Subject: Re: [RE-wrenches] grid tie sync with big stiff genny?<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>This should be possible. I have discussed what it
might take to set <o:p></o:p></p>
<p class=MsoPlainText>up a system like that in the Gambia, with wind
generators. It would <o:p></o:p></p>
<p class=MsoPlainText>take a control system with differential current sensors
and other <o:p></o:p></p>
<p class=MsoPlainText>features. The UL 1741 specifications would probably
need to be <o:p></o:p></p>
<p class=MsoPlainText>opened up on multiple direct grid tie inverters. There
would be a <o:p></o:p></p>
<p class=MsoPlainText>practical limit on the percentage of feed to the
generator mini grid.<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>This being said, I've not received much encouragement
with this <o:p></o:p></p>
<p class=MsoPlainText>idea. There are a lot of factors to consider.<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>At 09:35 AM 3/11/2009, you wrote:<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>>Undoubtably many of us are getting interesting
project requests as <o:p></o:p></p>
<p class=MsoPlainText>>folks want to sprinkle magic stimulus dust on things
to make solar <o:p></o:p></p>
<p class=MsoPlainText>>panels grow...<o:p></o:p></p>
<p class=MsoPlainText>><o:p> </o:p></p>
<p class=MsoPlainText>><o:p> </o:p></p>
<p class=MsoPlainText>><o:p> </o:p></p>
<p class=MsoPlainText>>We have a project with a huge electrical load,
pumping water for a <o:p></o:p></p>
<p class=MsoPlainText>>medium sized city. They want solar...
great. Easy.<o:p></o:p></p>
<p class=MsoPlainText>><o:p> </o:p></p>
<p class=MsoPlainText>><o:p> </o:p></p>
<p class=MsoPlainText>><o:p> </o:p></p>
<p class=MsoPlainText>>They had a power outage and kept running with 2.6 MW
of diesel <o:p></o:p></p>
<p class=MsoPlainText>>generators. They are interested in solar's
ability to do <o:p></o:p></p>
<p class=MsoPlainText>>"backup". I don't think that many
batteries will fit in my pickup <o:p></o:p></p>
<p class=MsoPlainText>>truck, and I hate working with 300/0 wire.<o:p></o:p></p>
<p class=MsoPlainText>><o:p> </o:p></p>
<p class=MsoPlainText>><o:p> </o:p></p>
<p class=MsoPlainText>><o:p> </o:p></p>
<p class=MsoPlainText>>QUESTION: (and maybe its an easy one and the
SMA guys will say, <o:p></o:p></p>
<p class=MsoPlainText>>sure, we did that in Greece). Is it viable to
set up a micro-grid <o:p></o:p></p>
<p class=MsoPlainText>>in this scenario and run an island-mode, with
available solar <o:p></o:p></p>
<p class=MsoPlainText>>reducing the genny plant demand? Should I just
say "forget it" or, <o:p></o:p></p>
<p class=MsoPlainText>>at this MW scale, would the switchgear and effort be
practical?<o:p></o:p></p>
<p class=MsoPlainText>><o:p> </o:p></p>
<p class=MsoPlainText>><o:p> </o:p></p>
<p class=MsoPlainText>><o:p> </o:p></p>
<p class=MsoPlainText>>Thanks.<o:p></o:p></p>
<p class=MsoPlainText>><o:p> </o:p></p>
<p class=MsoPlainText>>For a brighter energy future,<o:p></o:p></p>
<p class=MsoPlainText>><o:p> </o:p></p>
<p class=MsoPlainText>>Geoff Greenfield<o:p></o:p></p>
<p class=MsoPlainText>>President<o:p></o:p></p>
<p class=MsoPlainText>>Third Sun Solar & Wind Power Ltd.<o:p></o:p></p>
<p class=MsoPlainText>>340 West State Street, Unit 25<o:p></o:p></p>
<p class=MsoPlainText>>Athens, OH 45701<o:p></o:p></p>
<p class=MsoPlainText>><o:p> </o:p></p>
<p class=MsoPlainText>>740.597.3111 Fax 740.597.1548<o:p></o:p></p>
<p class=MsoPlainText>>www.Third-Sun.com<o:p></o:p></p>
<p class=MsoPlainText>><o:p> </o:p></p>
<p class=MsoPlainText>>Clean Energy - Expertly Installed<o:p></o:p></p>
<p class=MsoPlainText>><o:p> </o:p></p>
<p class=MsoPlainText>><o:p> </o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
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