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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. Darryl is right about the amount of words necessary. Allan Sindelar On 7/21/2010 1:21 PM, Darryl Thayer wrote: 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 <ma...@berkeleysolar.com> wrote:From: Mark Frye <ma...@berkeleysolar.com> Subject: Re: [RE-wrenches] Propane Generator, Dual Outback Inverters To: "'RE-wrenches'" <re-wrenches@lists.re-wrenches.org> 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 www.berkeleysolar.com -----Original Message----- From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Jason Szumlanski Sent: Wednesday, July 21, 2010 11:21 AM To: re-wrenches@lists.re-wrenches.org 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 _______________________________________________ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org _______________________________________________ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org |
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