<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:arial,helvetica,sans-serif;font-size:12pt"> Robb Cary was dealing with a lot of large scale telecomm systems with C&D Technologies, so his scary photos were probably not from solar projects, (if that is any comfort!) He spoke of some projects with 50,000 2V industrial cells. I have worked with him for a long time and served on the board of Solar Sebastopol with him 5-6 years ago. I too have lost touch. I tried to reach him four or five years ago but his office said that he was retired and his cell number was disconnected.<br><div> </div>Nick Soleil<br>Project Manager<br>Advanced Alternative Energy Solutions, LLC<br>PO Box 657<br>Petaluma, CA 94953<br>Cell: 707-321-2937<br>Office: 707-789-9537<br>Fax: 707-769-9037<div><br></div><div style="font-family: arial,helvetica,sans-serif; font-size: 12pt;"><br><div
style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><font face="Tahoma" size="2"><hr size="1"><b><span style="font-weight: bold;">From:</span></b> Darryl Thayer <daryl_solar@yahoo.com><br><b><span style="font-weight: bold;">To:</span></b> RE-wrenches <re-wrenches@lists.re-wrenches.org><br><b><span style="font-weight: bold;">Sent:</span></b> Wed, December 15, 2010 9:14:15 AM<br><b><span style="font-weight: bold;">Subject:</span></b> Re: [RE-wrenches] Battery based hydrogen incidents<br></font><br>
<meta http-equiv="x-dns-prefetch-control" content="off"><table border="0" cellpadding="0" cellspacing="0"><tbody><tr><td style="font: inherit;" valign="top"><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: 2px solid rgb(16, 16, 255); 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 rel="nofollow" title="dana@solarwork.com" target="_blank" href="http://us.mc393.mail.yahoo.com/mc/compose?to=dana@solarwork.com">Dana</a> </div>
<div><b>Sent:</b> Wednesday, December 15, 2010 9:10 AM</div>
<div><b>To:</b> <a rel="nofollow" title="re-wrenches@lists.re-wrenches.org" target="_blank" href="http://us.mc393.mail.yahoo.com/mc/compose?to=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></p></div>
<p class="yiv1640352157MsoNormal"><span style="font-family: 'sans-serif'; color: windowtext; font-size: 14pt;"></span> </p></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></p></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>
</p><p class="yiv1640352157MsoNormal"><span style="font-family: 'sans-serif'; color: windowtext; font-size: 14pt;"></span>
</p><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>
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<p class="yiv1640352157MsoNormal"><span style="font-family: 'sans-serif'; color: windowtext;">Dana Orzel</span></p></div>
<p class="yiv1640352157MsoNormal"><span style="font-family: 'sans-serif'; color: windowtext;">Great Solar Works, Inc</span>
</p><p class="yiv1640352157MsoNormal"><span style="font-family: 'sans-serif'; color: windowtext;">E - dana@solarwork.com</span>
</p><p class="yiv1640352157MsoNormal"><span style="font-family: 'sans-serif'; color: windowtext;">V - 970.626.5253</span>
</p><p class="yiv1640352157MsoNormal"><span style="font-family: 'sans-serif'; color: windowtext;">F - 970.626.4140</span>
</p><p class="yiv1640352157MsoNormal"><span style="font-family: 'sans-serif'; color: windowtext;">C - 970.209.4076</span>
</p><p class="yiv1640352157MsoNormal"><span style="font-family: 'sans-serif'; color: windowtext;">web - <a target="_blank" href="http://www.solarwork.com">www.solarwork.com</a></span>
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</p><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>
</p><p class="yiv1640352157MsoNormal"><span style="font-family: 'sans-serif'; color: windowtext;">Do not ever belive anything, but seriously trust through action.</span>
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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></p></div></div>
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</p><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 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
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