<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;"><DIV>Yes they happen, Robb Cary of Battery Testing Co. has some frightening photos. I have lost contact with him however. I have had an experiance, but I did not take pictures. When you find the top of the battery and or battery enclousure blowen to smitherens it was a hydrogen explosion. Sorry I am on road today, would love to comment more. maybe later</DIV>
<DIV>Darryl<BR><BR>--- On <B>Wed, 12/15/10, Warren Lauzon <I><warren@wind-sun.com></I></B> wrote:<BR></DIV>
<BLOCKQUOTE style="BORDER-LEFT: rgb(16,16,255) 2px solid; PADDING-LEFT: 5px; MARGIN-LEFT: 5px"><BR>From: Warren Lauzon <warren@wind-sun.com><BR>Subject: Re: [RE-wrenches] Battery based hydrogen incidents<BR>To: "RE-wrenches" <re-wrenches@lists.re-wrenches.org><BR>Date: Wednesday, December 15, 2010, 11:05 AM<BR><BR>
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<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>
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<DIV><B>From:</B> <A title=dana@solarwork.com href="http://us.mc393.mail.yahoo.com/mc/compose?to=dana@solarwork.com" rel=nofollow target=_blank ymailto="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="http://us.mc393.mail.yahoo.com/mc/compose?to=re-wrenches@lists.re-wrenches.org" rel=nofollow target=_blank ymailto="mailto:re-wrenches@lists.re-wrenches.org">'RE-wrenches'</A> </DIV>
<DIV><B>Subject:</B> [RE-wrenches] Battery based hydrogen incidents</DIV></DIV></DIV>
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<P class=yiv1640352157MsoNormal><SPAN style="FONT-FAMILY: 'sans-serif'; COLOR: windowtext; FONT-SIZE: 14pt">Ken – </SPAN></DIV>
<P class=yiv1640352157MsoNormal><SPAN style="FONT-FAMILY: 'sans-serif'; COLOR: windowtext; FONT-SIZE: 14pt"></SPAN> </DIV>
<P class=yiv1640352157MsoNormal><SPAN style="FONT-FAMILY: '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.</SPAN></DIV>
<P class=yiv1640352157MsoNormal><SPAN style="FONT-FAMILY: 'sans-serif'; COLOR: windowtext; FONT-SIZE: 14pt"></SPAN> </DIV>
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<P class=yiv1640352157MsoNormal><SPAN style="FONT-FAMILY: '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.</SPAN></DIV>
<P class=yiv1640352157MsoNormal><SPAN style="FONT-FAMILY: 'sans-serif'; COLOR: windowtext; FONT-SIZE: 14pt"></SPAN> </DIV>
<P class=yiv1640352157MsoNormal><SPAN style="FONT-FAMILY: 'sans-serif'; COLOR: windowtext; FONT-SIZE: 14pt">Q - How many battery based hydrogen incidents have happened in our collective experience?</SPAN></DIV>
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<P class=yiv1640352157MsoNormal><SPAN style="FONT-FAMILY: 'sans-serif'; COLOR: windowtext">Dana Orzel</SPAN></DIV>
<P class=yiv1640352157MsoNormal><SPAN style="FONT-FAMILY: 'sans-serif'; COLOR: windowtext">Great Solar Works, Inc</SPAN></DIV>
<P class=yiv1640352157MsoNormal><SPAN style="FONT-FAMILY: 'sans-serif'; COLOR: windowtext">E - dana@solarwork.com</SPAN></DIV>
<P class=yiv1640352157MsoNormal><SPAN style="FONT-FAMILY: 'sans-serif'; COLOR: windowtext">V - 970.626.5253</SPAN></DIV>
<P class=yiv1640352157MsoNormal><SPAN style="FONT-FAMILY: 'sans-serif'; COLOR: windowtext">F - 970.626.4140</SPAN></DIV>
<P class=yiv1640352157MsoNormal><SPAN style="FONT-FAMILY: 'sans-serif'; COLOR: windowtext">C - 970.209.4076</SPAN></DIV>
<P class=yiv1640352157MsoNormal><SPAN style="FONT-FAMILY: 'sans-serif'; COLOR: windowtext">web - www.solarwork.com</SPAN></DIV>
<P class=yiv1640352157MsoNormal><SPAN style="FONT-FAMILY: 'sans-serif'; COLOR: windowtext"></SPAN> </DIV>
<P class=yiv1640352157MsoNormal><SPAN style="FONT-FAMILY: 'sans-serif'; COLOR: windowtext">"Responsible Technologies for Responsible People since 1988"</SPAN><SPAN style="FONT-FAMILY: 'sans-serif'; COLOR: windowtext; FONT-SIZE: 11pt"></SPAN></DIV>
<P class=yiv1640352157MsoNormal><SPAN style="FONT-FAMILY: 'sans-serif'; COLOR: windowtext">Do not ever belive anything, but seriously trust through action.</SPAN></DIV></DIV>
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<P style="MARGIN-LEFT: 0.5in" class=yiv1640352157MsoNormal><B><SPAN style="FONT-FAMILY: 'sans-serif'; COLOR: windowtext; FONT-SIZE: 10pt">From:</SPAN></B><SPAN style="FONT-FAMILY: '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</SPAN></DIV></DIV></DIV>
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<P style="MARGIN-LEFT: 0.5in" class=yiv1640352157MsoNormal>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" rel=nofollow target=_blank>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</DIV></DIV>
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