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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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<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>
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<br>
On 7/21/2010 1:21 PM, Darryl Thayer wrote:
<blockquote cite="mid:814472.38425.qm@web51905.mail.re2.yahoo.com"
type="cite">
<pre wrap="">The propane and gasoline generators both ar premixed combustion and have a low efficiency at part throttle/ part load. The Diesel does the best job of maintaining efficency at low load. The outback can control its charging current to the load limit of the generator. If the AC loads need more power the Outback can reduce the charging rate until the AC load diminishes.
It takes a lot of words to describe and decide what is the correct generator sizing.
Darryl
--- On Wed, 7/21/10, Mark Frye <a class="moz-txt-link-rfc2396E" href="mailto:markf@berkeleysolar.com"><markf@berkeleysolar.com></a> wrote:
</pre>
<blockquote type="cite">
<pre wrap="">From: Mark Frye <a class="moz-txt-link-rfc2396E" href="mailto:markf@berkeleysolar.com"><markf@berkeleysolar.com></a>
Subject: Re: [RE-wrenches] Propane Generator, Dual Outback Inverters
To: "'RE-wrenches'" <a class="moz-txt-link-rfc2396E" href="mailto:re-wrenches@lists.re-wrenches.org"><re-wrenches@lists.re-wrenches.org></a>
Date: Wednesday, July 21, 2010, 1:33 PM
Can you say something more about the
system? Is there a PV component? What
is the size and type of the battery bank?
The thing I am beginning to understand about propane
generators is that
there is a problem with Outback charging re: partial load
efficiency. If
the generator/chargers are sized to give a good C/10 bulk
charge rate, then
they will be running well below 50% load when they are
providing a desirable
absorption phase current. That's extended absorption run
times at poor
generator efficiencies. This also plays into having a
generator that is
sized for full AC loads and full charger currents. If you
design for this
case, but do not have large AC loads during charging, you
will be well down
into the 25% load on the gererator, very inefficient with
propane.
I have had very good success with my Kohler 30kw REGZ
2-wire start propane
generator in a lower elevation, California foothills
location.
What exactly do you mean by harsh environment?
Mark Frye
Berkeley Solar Electric Systems
303 Redbud Way
Nevada City, CA 95959
(530) 401-8024
<a class="moz-txt-link-abbreviated" href="http://www.berkeleysolar.com">www.berkeleysolar.com</a>
-----Original Message-----
From: <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>]
On Behalf Of Jason
Szumlanski
Sent: Wednesday, July 21, 2010 11:21 AM
To: <a class="moz-txt-link-abbreviated" href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a>
Subject: [RE-wrenches] Propane Generator, Dual Outback
Inverters
I'm looking for experiences/recommendations for a 15-20kW
propane generator.
It would be going in an off-grid system with dual Outback
3600W
inverter/chargers. The excess capacity would power larger
loads than the
inverters can handle. Fuel economy and harsh environment
performance are the
top priorities (along with the ever important $).
Jason Szumlanski
Fafco Solar
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