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<DIV dir=ltr>
<DIV style="FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: 12pt">
<DIV>In the 30+ years that we have been in the solar business, we have never
seen or even heard of a single one.</DIV>
<DIV> </DIV>
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style="FONT-STYLE: normal; DISPLAY: inline; FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: small; FONT-WEIGHT: normal; TEXT-DECORATION: none">
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<DIV> </DIV>
<DIV style="BACKGROUND: #f5f5f5">
<DIV style="font-color: black"><B>From:</B> <A title=dana@solarwork.com
href="mailto:dana@solarwork.com">Dana</A> </DIV>
<DIV><B>Sent:</B> Wednesday, December 15, 2010 9:10 AM</DIV>
<DIV><B>To:</B> <A title=re-wrenches@lists.re-wrenches.org
href="mailto:re-wrenches@lists.re-wrenches.org">'RE-wrenches'</A> </DIV>
<DIV><B>Subject:</B> [RE-wrenches] Battery based hydrogen
incidents</DIV></DIV></DIV>
<DIV> </DIV></DIV>
<DIV
style="FONT-STYLE: normal; DISPLAY: inline; FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: small; FONT-WEIGHT: normal; TEXT-DECORATION: none">
<DIV class=WordSection1>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Century Gothic','sans-serif'; COLOR: windowtext; FONT-SIZE: 14pt">Ken
– <o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Century Gothic','sans-serif'; COLOR: windowtext; FONT-SIZE: 14pt"><o:p></o:p></SPAN> </P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Century Gothic','sans-serif'; COLOR: windowtext; FONT-SIZE: 14pt">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-FAMILY: 'Century Gothic','sans-serif'; COLOR: windowtext; FONT-SIZE: 14pt"><o:p></o:p></SPAN> </P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Century Gothic','sans-serif'; COLOR: windowtext; FONT-SIZE: 14pt"><o:p></o:p></SPAN> </P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Century Gothic','sans-serif'; COLOR: windowtext; FONT-SIZE: 14pt">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-FAMILY: 'Century Gothic','sans-serif'; COLOR: windowtext; FONT-SIZE: 14pt"><o:p></o:p></SPAN> </P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Century Gothic','sans-serif'; COLOR: windowtext; FONT-SIZE: 14pt">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-FAMILY: 'Century Gothic','sans-serif'; COLOR: windowtext; FONT-SIZE: 14pt"><o:p></o:p></SPAN> </P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Century Gothic','sans-serif'; COLOR: windowtext; FONT-SIZE: 14pt"><o:p></o:p></SPAN> </P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Century Gothic','sans-serif'; COLOR: windowtext; FONT-SIZE: 14pt"><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 -
dana@solarwork.com<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 -
www.solarwork.com<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-FAMILY: 'Calibri','sans-serif'; COLOR: windowtext; FONT-SIZE: 11pt"><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-FAMILY: 'Century Gothic','sans-serif'; COLOR: windowtext; FONT-SIZE: 14pt"><o:p></o:p></SPAN> </P>
<DIV>
<DIV
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<P style="MARGIN-LEFT: 0.5in" class=MsoNormal><B><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; COLOR: windowtext; FONT-SIZE: 10pt">From:</SPAN></B><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; COLOR: windowtext; FONT-SIZE: 10pt">
re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org] <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 style="MARGIN-LEFT: 0.5in" class=MsoNormal><o:p></o:p> </P>
<P style="MARGIN-LEFT: 0.5in" class=MsoNormal>Fellow Wrenches,<BR><BR>The
discussion about battery venting reminds me of a useful and inexpensive program,
<A
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></DIV>
<P>
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