Hi Dan, I've see this as well, but I don't put it down to a enclosure problem but a build up inside a individual battery cell,( plugged cap, etc) which IMHO even if the batteries were outside wouldn't help prevent it. Never the less, why I use eye protection every time I go see batteries.
Jay peltz power On Dec 15, 2010, at 9:56 AM, Exeltech wrote: > 38+ years in RE. Knowledge of one incident (an off-grid friend). > > Very sunny day. Very windy. My friend had both PV and a wind generator > (still does). He had just stepped out of the room where the batteries were > located when (as he described it) he heard something like a loud gunshot. He > went back inside to find one of the L16s exploded, top completely blown off, > and case broken much of the way down one side. > > Had the incident occurred only minutes earlier, injuries could have resulted. > He has since relocated his batteries to a dedicated (and vented) battery > space. > > Dan > > > --- On Wed, 12/15/10, Kent Osterberg <k...@coveoregon.com> wrote: > > From: Kent Osterberg <k...@coveoregon.com> > Subject: Re: [RE-wrenches] Battery based hydrogen incidents > To: "RE-wrenches" <re-wrenches@lists.re-wrenches.org> > Date: Wednesday, December 15, 2010, 11:21 AM > > Sounds like, in general, that the off-grid industry has been fortunate to not > have hydrogen explosions. That's good. No explosions here either. But one > shouldn't take that as evidence that it couldn't happen. I don't believe > this is a circumstance where it is better to be lucky than good. That's why > I recommend doing the calculations. > > Kent Osterberg > Blue Mountain Solar > > > > 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 >
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