They are expensive. But from a technical point of view, very few people understand (or know how to use) the concept of “Days of Autonomy”. I personally use a 3X factor but if I want to be extra conservative and the application is is critical I use a 4X factor.
- Peter Peter T. Parrish SolarGnosis 1107 Fair Oaks Ave. Ste. 351 South Pasadena, CA 91030 (323) 839-6108 [email protected] From: Dan Fink Sent: Sunday, December 9, 2018 9:10 AM To: RE-wrenches Subject: Re: [RE-wrenches] Portable Power Centers Every one of these I've seen so far....dating back over 10 years....drastically undersizes the battery bank, I assume because that's the expensive part. Dan Fink Professor of Solar Energy Technology, Ecotech Institute IREC Certified Instructor™ for: ~ PV Installation Professional ~ Small Wind Installer Executive Director, Buckville Energy NABCEP Registered Continuing Education Providers™ NABCEP PV Associate 970.672.4342 On Sun, Dec 9, 2018 at 9:21 AM [email protected] <[email protected]> wrote: I recently saw a YouTube video that compared 4 or 5 portable power units. You might try a search there. Glenn Sent from my 'smart' phone so please excuse spelling and typos. ------ Original message------ From: Peter Parrish Date: Sun, Dec 9, 2018 1:17 AM To: RE-wrenches; Cc: Subject:[RE-wrenches] Portable Power Centers We are working with Turning Point Foundation a 501(c)3 to provide off-grid power for their River Haven project which is providing transitional housing for homeless folks in the Ventura CA area. The site is truly off-grid and currently uses propane to power three refrigerators and cook stoves. There is no space heating for the single occupancy rooms as of yet. But that’s another problem. We are looking to specify DC refrigerators and PV-powered battery storage for the River Haven project. We are looking at the Goal Zero Yeti-3000 system (3000 Whr, 500 full discharge cycles, to 80% residual capacity) at a sale price of $2,400 but are finding the extra cost of their PV modules quite steep. And looking at other 36-cell (12 volt) modules, I can’t find anything for less than $1.10/W. Since Goal Zero is looking at the recreational market, I thought that there might be o ther companies with comparable product offerings that are focusing on other markets like developing countries. Any advice would be appreciated and you may contact us off-line. Peter T. Parrish SolarGnosis 1107 Fair Oaks Ave. Ste. 351 South Pasadena, CA 91030 (323) 839-6108 [email protected] _______________________________________________ List sponsored by Redwood Alliance List Address: [email protected] Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/[email protected]/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
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