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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:
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<p class="MsoNormal"><span
style="font-size: 14pt; font-family: "Century Gothic","sans-serif"; color: windowtext;">Ken
– <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 14pt; font-family: "Century Gothic","sans-serif"; color: windowtext;"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 14pt; font-family: "Century Gothic","sans-serif"; 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.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 14pt; font-family: "Century Gothic","sans-serif"; color: windowtext;"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 14pt; font-family: "Century Gothic","sans-serif"; color: windowtext;"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 14pt; font-family: "Century Gothic","sans-serif"; 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.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 14pt; font-family: "Century Gothic","sans-serif"; color: windowtext;"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 14pt; font-family: "Century Gothic","sans-serif"; color: windowtext;">Q
- How many battery based hydrogen incidents have happened in our
collective experience?<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 14pt; font-family: "Century Gothic","sans-serif"; color: windowtext;"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 14pt; font-family: "Century Gothic","sans-serif"; color: windowtext;"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 14pt; font-family: "Century Gothic","sans-serif"; color: windowtext;"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><span
style="font-family: "Century Gothic","sans-serif"; color: windowtext;">Dana
Orzel<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family: "Century Gothic","sans-serif"; color: windowtext;">Great
Solar Works, Inc<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family: "Century Gothic","sans-serif"; color: windowtext;">E
- <a class="moz-txt-link-abbreviated" href="mailto:dana@solarwork.com">dana@solarwork.com</a><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family: "Century Gothic","sans-serif"; color: windowtext;">V
- 970.626.5253<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family: "Century Gothic","sans-serif"; color: windowtext;">F
- 970.626.4140<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family: "Century Gothic","sans-serif"; color: windowtext;">C
- 970.209.4076<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family: "Century Gothic","sans-serif"; color: windowtext;">web
- <a class="moz-txt-link-abbreviated" href="http://www.solarwork.com">www.solarwork.com</a><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family: "Century Gothic","sans-serif"; color: windowtext;"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-family: "Century Gothic","sans-serif"; color: windowtext;">"Responsible
Technologies for Responsible People since 1988"</span><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: windowtext;"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family: "Century Gothic","sans-serif"; color: windowtext;">Do
not ever belive anything, but seriously trust through action.<o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span
style="font-size: 14pt; font-family: "Century Gothic","sans-serif"; color: windowtext;"><o:p> </o:p></span></p>
<div>
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<p class="MsoNormal" style="margin-left: 0.5in;"><b><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif"; color: windowtext;">From:</span></b><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif"; color: windowtext;">
<a class="moz-txt-link-abbreviated" href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a>
[<a class="moz-txt-link-freetext" href="mailto: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<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal" style="margin-left: 0.5in;"><o:p> </o:p></p>
<p class="MsoNormal" 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"
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<o:p></o:p></p>
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