Thanks Bill, and everyone else: When I was a CA solar contractor, I designed and oversaw the installation of over 20 “grid-tied battery back up systems”. I now have an approved application into the Southern California Edison SGIP program, spec’ing a 16 kWh and 8 kW “smart” e-storage system. The system will use Li-ion batteries (the exact manu and chemistry escapes me right now).
I don’t quite understand the relative lack of traction regarding Li for small scale remote/recreational applications. I understand a little about BMS, enough to be dangerous. So perhaps the biggest question I have is why NOT design-in a Li battery system as long as it come wrapped with a BSM? Any brands/technologies recommended? Also thanks for the info on 36 cell vs. 60 cell PV modules. If I were to specify a system from scratch (and that is the direction I’m heading), I would go with 60 cell modules (even 72 cell modules) and a MPPT CC that can handle the voltage and current range. And thanks for the recommendation on AC vs DC powered refrigerators. I don’t want to handle the service call! Thanks to everyone for their input. - Peter Peter T. Parrish SolarGnosis 1107 Fair Oaks Ave. Ste. 351 South Pasadena, CA 91030 (323) 839-6108 peter.parr...@solargnosis.com From: William Dorsett Sent: Sunday, December 9, 2018 10:56 PM To: 'RE-wrenches' Subject: Re: [RE-wrenches] Portable Power Centers Especially for this group of people, who are used to making do with resources as they come, there was a very interesting concept article in HomePower, Issue #186, July / August 2018, called DayLight Drive by Alexis Zeigler • Living Energy Farm, Louisa, Virginia. https://www.homepower.com/articles/solar-electricity/equipment-products/mailbox-daylight-drive The concept is in minimizing the expense of battery storage by using sun… well “DayLight” as it happens. I think the concept is particularly relevant to situations like you are describing and in developing countries. But also more to us as we look to the role of storage in general. Thanks for the thoughts, Alexis. Bill Dorsett Flint Hills Renewable Energy & Efficiency Cooperative, Inc. “Start where you are. Use what you have. Do what you can” Arthur Ashe 1715 Leavenworth Manhattan, KS 66502 www.fhreec.org 785/539-1956 Office 785/564-2583 Cell wmdors...@cox.net From: RE-wrenches <re-wrenches-boun...@lists.re-wrenches.org> On Behalf Of Peter Parrish Sent: Saturday, December 08, 2018 5:27 PM To: RE-wrenches <re-wrenches@lists.re-wrenches.org> 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 other 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 peter.parr...@solargnosis.com
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