Hi Dana, In 22 years of installing off grid systems I have never seen or heard of one, but then, we have always vented our battery based systems, even the VRLA type batteries......
Daryl Penobscot Solar Design > Hi Dana, > > I've been 16 years all offgrid, no reports that I know of. > > jay > > peltz power > On Dec 15, 2010, at 8:10 AM, Dana wrote: > >> Ken >> >> To meet the flow have run 2 and 3 fans to meet the flow. 2 output from >> the fan into a 4 header with a matching 2.5 inlet as far away on the >> lowest portion of the battery box. >> >> >> In 22+ years in off grid installations I have yet to see or even hear of >> one hydrogen explosion. I get repeatedly asked why we have to go to the >> efforts we go to for box and venting. I am not able to provide even one >> incident that I have heard rumor of. >> >> Q - How many battery based hydrogen incidents have happened in our >> collective experience? >> >> >> >> Dana Orzel >> Great Solar Works, Inc >> E - d...@solarwork.com >> V - 970.626.5253 >> F - 970.626.4140 >> C - 970.209.4076 >> web - www.solarwork.com >> >> "Responsible Technologies for Responsible People since 1988" >> Do not ever belive anything, but seriously trust through action. >> >> From: re-wrenches-boun...@lists.re-wrenches.org >> [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Kent >> Osterberg >> Sent: Tuesday, December 14, 2010 12:07 PM >> To: Wrenches >> Subject: [RE-wrenches] Battery Venting >> >> Fellow Wrenches, >> >> The discussion about battery venting reminds me of a useful and >> inexpensive program, BattMV, for determining ventilation requirements >> per EN-50272. EN-50272 is a European standard used to determine how >> much air flow is needed for a room, I don't know of a equivalent >> standard used in the U.S. It takes a surprising amount of ventilation. >> For a 400-AH 48-volt L16 bank charged at 57.6 volts and 24 amps, it's >> about 7 CFM just to keep the %H2 down to 4%. A 12-volt Zephyr vent is >> good for about 5 CFM! If you think you are venting enough, take some >> time and study this issue. >> >> Kent Osterberg >> Blue Mountain 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 > > _______________________________________________ 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