I for one like a DC light in my inverter room. Just sayin'... Brian Mehalic NABCEP Certified Solar PV Installer™ R031508-59 IREC ISPQ Certified Affiliated Instructor/PV US-0132
PV Curriculum Developer and Instructor Solar Energy International http://www.solarenergy.org On Tue, Dec 11, 2012 at 2:05 PM, Chris Daum <ch...@oasismontana.com> wrote: > ** > The Sundanzers can be converted for AC use at the factory for a nominal > cost, and they claim it affects efficiency very little. > > Chris Daum > Oasis Montana Inc. > 406-777-4309 > 406-777-0830 fax > www.oasismontana.com > > > ------------------------------ > *From:* re-wrenches-boun...@lists.re-wrenches.org [mailto: > re-wrenches-boun...@lists.re-wrenches.org] *On Behalf Of *Larry > Crutcher,Starlight Solar Power Systems > *Sent:* Tuesday, December 11, 2012 11:56 AM > *To:* RE-wrenches > *Subject:* [RE-wrenches] DC, or not DC, Dat is Da question (Two Load > Questions) > > Why would one specify DC voltage appliances or lighting for off grid > systems today when we have sub-buck-a-Watt PV solar power? If you have > space, you can make the added power that conventional AC appliances draw > for very low cost. It could even be argued that the cost for DC items, > wiring, distribution gear and labor will cost much more than simply adding > more PV solar and staying all AC. > > I don't like wasting resources and I understand old school thinking when > PV modules were very expensive, but with high efficiency AC appliances and > low cost inverters and PV modules, does it still make any sense? Shine some > light on my thinking. > > Larry Crutcher > Starlight Solar Power Systems > > > > > > On Dec 10, 2012, at 9:12 PM, Allan Sindelar wrote: > > Wrenches, > We still try to encourage prospective off grid customers to do a full load > analysis as an initial step in the system design process. To the point: > > 1) What is a good watt-hours/day figure to use for a typical, modern, new, > carefully chosen, fairly large conventional AC chest freezer, if kept in a > heated indoor location? Assume 65 degrees and seldom opened. > > I will encourage that the freezer be located in a shaded, protected > outdoor location, in order to greatly reduce winter energy consumption, but > I need a good base figure to work with. > > The proposed system will most likely be 48Vnom, so a Sundanzer or similar > DC freezer is out. > > 2) Same question for a ceiling fan, for general slow circulation of winter > heat. The energystar.gov list gives relative cfm efficiency but not > wattages. Is 55W still a good figure to use as a default? > > > I have attached a condensed energystar.gov list for the freezers, but > wonder what other off grid Wrenches typically use. Also, I'm not sure that > Wrenches posts allow attachments, so this may not appear with my message. > > Thank you, > Allan > -- > *Allan Sindelar* > *al...@positiveenergysolar.com* <al...@positiveenergysolar.com> > NABCEP Certified Photovoltaic Installer > NABCEP Certified Technical Sales Professional > New Mexico EE98J Journeyman Electrician > Founder and Chief Technology Officer > *Positive Energy, Inc.* > 3209 Richards Lane (note new address) > Santa Fe, New Mexico 87507 > *505 424-1112* > *www.positiveenergysolar.com* <http://www.positiveenergysolar.com/>**** > > ***************** > * > > <Freezers Product List.xlsx> > _______________________________________________ > 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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