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Mark,<br>
Yeah, the gennie is set to come on automatically through the Mate,
but the homeowner pays attention.<br>
<br>
There's about 5kW of array for this off-grid home as well, so it's a
gennie-backed PV system. Also, all modules are on trackers (long
boring story) so there's plenty of PV in summer, but they depend on
the generator as an integral part of charging in the winter, and the
owner is involved in system operation. (He happens to be the rare
customer with a Ph.D. in physics; so engaged that he successfully
added a thermostatically-controlled heat exchanger with fail-safe
backup to the generator's coolant lines that he piped into his
solar-radiant-with-boiler infloor heating system, to increase
generator overall efficiency.)<br>
<br>
Continuous operation at low load can be harmful and inefficient, but
occasional operation isn't something to lose sleep over.<br>
<br>
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<p class="MsoNormal" style=""><span class="il"><b style="">Allan</b></span><b
style=""> Sindelar</b><span style="font-size: 10pt;"><br>
<a href="mailto:Allan@positiveenergysolar.com"
target="_blank"><span class="il">Allan</span>@positiveenergysolar.com</a><br>
NABCEP Certified Photovoltaic Installer<br>
EE98J Journeyman Electrician<br>
<b style="">Positive Energy, Inc.</b><br>
3201 Calle Marie<br>
Santa Fe, New Mexico 87507<br>
<b style="">505 424-1112</b><br>
<a href="http://www.positiveenergysolar.com/"
target="_blank">www.positiveenergysolar.com</a></span></p>
</div>
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<br>
On 7/21/2010 4:25 PM, Mark Frye wrote:
<blockquote cite="mid:6D4FB40E024F42C9A77A6C0C689DE9EC@marksdell"
type="cite">
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<div dir="ltr" align="left"><font color="#0000ff" face="Arial"
size="2"><span class="484041922-21072010">Allen,</span></font></div>
<div dir="ltr" align="left"><font color="#0000ff" face="Arial"
size="2"><span class="484041922-21072010"></span></font> </div>
<div dir="ltr" align="left"><font color="#0000ff" face="Arial"
size="2"><span class="484041922-21072010">Can I infer that if
you are shutting off the gen before charge rates drop in
absorption that you are running only briefly in the absorb
phase? Or do your charge currents remain high through out an
extended absortion phase?</span></font></div>
<div dir="ltr" align="left"><font color="#0000ff" face="Arial"
size="2"><span class="484041922-21072010"></span></font> </div>
<div dir="ltr" align="left"><font color="#0000ff" face="Arial"
size="2"><span class="484041922-21072010">Perhaps you have
plenty of PV which you rely upon to bring the batteries up
through the absorption phase, once the gen is shut off.</span></font></div>
<div dir="ltr" align="left"><font color="#0000ff" face="Arial"
size="2"><span class="484041922-21072010"></span></font> </div>
<div dir="ltr" align="left"><font color="#0000ff" face="Arial"
size="2"><span class="484041922-21072010">I would be interest
to learn more about your approach to this.</span></font></div>
<div dir="ltr" align="left"><font color="#0000ff" face="Arial"
size="2"><span class="484041922-21072010"></span></font> </div>
<div dir="ltr" align="left"><font color="#0000ff" face="Arial"
size="2"><span class="484041922-21072010">Thanks,</span></font></div>
<div dir="ltr" align="left"><font color="#0000ff" face="Arial"
size="2"><span class="484041922-21072010"></span></font> <br>
<span lang="en-us"><font face="Arial" size="2">Mark Frye</font></span>
<br>
<span lang="en-us"><font face="Arial" size="2">Berkeley Solar
Electric Systems</font></span> <br>
<span lang="en-us"><font face="Arial" size="2">303 Redbud Way</font></span>
<br>
<span lang="en-us"><font face="Arial" size="2">Nevada City, CA
95959</font></span> <br>
<span lang="en-us"><font face="Arial" size="2">(530) 401-8024</font></span>
<br>
<span lang="en-us"></span><a moz-do-not-send="true"
href="http://www.berkeleysolar.com/"><span lang="en-us"><u><font
color="#0000ff" face="Arial" size="2">www.berkeleysolar.com</font></u></span></a><span
lang="en-us"><font face="Arial" size="2"> </font></span> </div>
<div> </div>
<br>
<div dir="ltr" class="OutlookMessageHeader" align="left"
lang="en-us">
<hr tabindex="-1">
<font face="Tahoma" size="2"><b>From:</b>
<a class="moz-txt-link-abbreviated" href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a>
[<a class="moz-txt-link-freetext" href="mailto:re-wrenches-bounces@lists.re-wrenches.org">mailto:re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On
Behalf Of </b>Allan Sindelar<br>
<b>Sent:</b> Wednesday, July 21, 2010 3:17 PM<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a><br>
<b>Subject:</b> Re: [RE-wrenches] Propane Generator, Dual
Outback Inverters<br>
</font><br>
</div>
The Onan RS20000 shown in the generators article in HP 131 page 98
has performed flawlessly as backup support to an Outback
quad-stack of VFX3648s. Differences, however, are that this 20kW
gennie charges four inverters, rather than two; the elevation is
6,600 feet for about a 20% output deration; there are no huge
loads above charging draw; and the client is aware enough to shut
it off before absorption reduces the charge rate - all different
conditions than you have described, as the gennie is usually fully
loaded and running in balance.<br>
<br>
Darryl is right about the amount of words necessary.<br>
<br>
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<div class="Section1">
<p class="MsoNormal"><span class="il"><b>Allan</b></span><b>
Sindelar</b><span style="font-size: 10pt;"><br>
<a moz-do-not-send="true"
href="mailto:Allan@positiveenergysolar.com"
target="_blank"><span class="il">Allan</span>@positiveenergysolar.com</a><br>
NABCEP Certified Photovoltaic Installer<br>
EE98J Journeyman Electrician<br>
<b>Positive Energy, Inc.</b><br>
3201 Calle Marie<br>
Santa Fe, New Mexico 87507<br>
<b>505 424-1112</b><br>
<a moz-do-not-send="true"
href="http://www.positiveenergysolar.com/"
target="_blank">www.positiveenergysolar.com</a></span></p>
</div>
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</blockquote>
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