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Knowledge of two incidents - sort of.<br>
About ten years ago a Hydrocap on an L16 blew apart. Not our
installation; I suspect that it became plugged up or overheated, as
the array had been recently enlarged. Explosion was contained within
the battery enclosure; just made a mess.<br>
<br>
About four years ago a small 12V automotive battery used only to
start a 6.5 Onan generator blew up, causing modest permanent hearing
damage to the homeowner. I wasn't there, and heard about it from
her. This wasn't a venting issue, as the battery was on the floor in
a ventilated room, but rather apparently a plugged cap in the
battery itself. <br>
<br>
Otherwise, nothing.<br>
Allan<br>
<br>
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<p class="MsoNormal" style=""><span class="il"><b style="">Allan</b></span><b
style=""> Sindelar</b><span style="font-size: 10pt;"><br>
<a href="mailto:Allan@positiveenergysolar.com"
target="_blank"><span class="il">Allan</span>@positiveenergysolar.com</a><br>
NABCEP Certified Photovoltaic Installer<br>
EE98J Journeyman Electrician<br>
<b style="">Positive Energy, Inc.</b><br>
3201 Calle Marie<br>
Santa Fe, New Mexico 87507<br>
<b style="">505 424-1112</b><br>
<a href="http://www.positiveenergysolar.com/"
target="_blank">www.positiveenergysolar.com</a></span></p>
</div>
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<br>
On 12/15/2010 10:56 AM, Exeltech wrote:
<blockquote cite="mid:512885.21113.qm@web113409.mail.gq1.yahoo.com"
type="cite">
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<td style="font: inherit;" valign="top">38+ years in RE.
Knowledge of one incident (an off-grid friend).<br>
<br>
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.<br>
<br>
Had the incident occurred only minutes earlier, injuries
could have resulted. He has since relocated his batteries
to a dedicated (and vented) battery space.<br>
<br>
Dan<br>
<br>
<br>
--- On <b>Wed, 12/15/10, Kent Osterberg <i><a class="moz-txt-link-rfc2396E" href="mailto:kent@coveoregon.com"><kent@coveoregon.com></a></i></b>
wrote:<br>
<blockquote style="border-left: 2px solid rgb(16, 16,
255); margin-left: 5px; padding-left: 5px;"><br>
From: Kent Osterberg <a class="moz-txt-link-rfc2396E" href="mailto:kent@coveoregon.com"><kent@coveoregon.com></a><br>
Subject: Re: [RE-wrenches] Battery based hydrogen
incidents<br>
To: "RE-wrenches"
<a class="moz-txt-link-rfc2396E" href="mailto:re-wrenches@lists.re-wrenches.org"><re-wrenches@lists.re-wrenches.org></a><br>
Date: Wednesday, December 15, 2010, 11:21 AM<br>
<br>
<div id="yiv1034715313"> 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.<br>
<br>
Kent Osterberg<br>
Blue Mountain Solar<br>
<br>
<br>
<br>
Dana wrote:
<blockquote type="cite">
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<p class="yiv1034715313MsoNormal"><span
style="font-size: 14pt; color: windowtext;">Ken
–
</span></p>
<p class="yiv1034715313MsoNormal"><span
style="font-size: 14pt; color: windowtext;"><br>
</span></p>
<p class="yiv1034715313MsoNormal"><span
style="font-size: 14pt; color: windowtext;">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.</span></p>
<p class="yiv1034715313MsoNormal"><span
style="font-size: 14pt; color: windowtext;"> </span></p>
<p class="yiv1034715313MsoNormal"><span
style="font-size: 14pt; color: windowtext;"> </span></p>
<p class="yiv1034715313MsoNormal"><span
style="font-size: 14pt; color: windowtext;">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.</span></p>
<p class="yiv1034715313MsoNormal"><span
style="font-size: 14pt; color: windowtext;"> </span></p>
<p class="yiv1034715313MsoNormal"><span
style="font-size: 14pt; color: windowtext;">Q
- How many battery based hydrogen incidents
have happened in our
collective experience?</span></p>
<p class="yiv1034715313MsoNormal"><span
style="font-size: 14pt; color: windowtext;"> </span></p>
<p class="yiv1034715313MsoNormal"><span
style="font-size: 14pt; color: windowtext;"><br>
</span></p>
<div>
<p class="yiv1034715313MsoNormal"><span
style="color: windowtext;">Dana
Orzel</span></p>
<p class="yiv1034715313MsoNormal"><span
style="color: windowtext;">Great
Solar Works, Inc</span></p>
<p class="yiv1034715313MsoNormal"><span
style="color: windowtext;">E
- <a moz-do-not-send="true" rel="nofollow"
class="yiv1034715313moz-txt-link-abbreviated"
ymailto="mailto:dana@solarwork.com"
target="_blank"
href="/mc/compose?to=dana@solarwork.com">dana@solarwork.com</a></span></p>
<p class="yiv1034715313MsoNormal"><span
style="color: windowtext;">V
- 970.626.5253</span></p>
<p class="yiv1034715313MsoNormal"><span
style="color: windowtext;">F
- 970.626.4140</span></p>
<p class="yiv1034715313MsoNormal"><span
style="color: windowtext;">C
- 970.209.4076</span></p>
<p class="yiv1034715313MsoNormal"><span
style="color: windowtext;">web
- <a moz-do-not-send="true" rel="nofollow"
class="yiv1034715313moz-txt-link-abbreviated" target="_blank"
href="http://www.solarwork.com">www.solarwork.com</a></span></p>
<p class="yiv1034715313MsoNormal"><span
style="color: windowtext;"> </span></p>
<p class="yiv1034715313MsoNormal"><span
style="color: windowtext;">"Responsible
Technologies for Responsible People since
1988"</span><span style="font-size: 11pt;
color: windowtext;"></span></p>
<p class="yiv1034715313MsoNormal"><span
style="color: windowtext;">Do
not ever belive anything, but seriously
trust through action.</span></p>
</div>
<p class="yiv1034715313MsoNormal"><span
style="font-size: 14pt; color: windowtext;"> </span></p>
<div>
<div style="border-style: solid none none;
border-color: rgb(181, 196, 223);
border-width: 1pt medium medium; padding: 3pt
0in 0in;">
<p class="yiv1034715313MsoNormal"
style="margin-left: 0.5in;"><b><span
style="font-size: 10pt; color:
windowtext;">From:</span></b><span
style="font-size: 10pt; color:
windowtext;">
<a moz-do-not-send="true" rel="nofollow"
class="yiv1034715313moz-txt-link-abbreviated"
ymailto="mailto:re-wrenches-bounces@lists.re-wrenches.org"
target="_blank"
href="/mc/compose?to=re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a>
[<a moz-do-not-send="true" rel="nofollow"
class="yiv1034715313moz-txt-link-freetext"
ymailto="mailto:re-wrenches-bounces@lists.re-wrenches.org"
target="_blank"
href="/mc/compose?to=re-wrenches-bounces@lists.re-wrenches.org">mailto:re-wrenches-bounces@lists.re-wrenches.org</a>]
<b>On Behalf Of </b>Kent
Osterberg<br>
<b>Sent:</b> Tuesday, December 14, 2010
12:07 PM<br>
<b>To:</b> Wrenches<br>
<b>Subject:</b> [RE-wrenches] Battery
Venting</span></p>
</div>
</div>
<p class="yiv1034715313MsoNormal"
style="margin-left: 0.5in;"> </p>
<p class="yiv1034715313MsoNormal"
style="margin-left: 0.5in;">Fellow Wrenches,<br>
<br>
The discussion about battery venting reminds me
of a useful and
inexpensive program, <a moz-do-not-send="true"
rel="nofollow" target="_blank"
href="http://pocketengineer.design.officelive.com/battery_ventilation.aspx">BattMV</a>,
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.<br>
<br>
Kent Osterberg<br>
Blue Mountain Solar</p>
</div>
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