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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Mac,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Never tap a battery bank off various voltages. This will result into unbalanced battery units, thus confusing the charger, resulting into unbalance charge,
boiling ones and sulfating others occurring, killing the battery fast…<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">When facing various loads with various operating voltage 12V, 24V, 48V, configuring the battery bank for the larger load voltage is recommended (due to losses
optimization) and use DC/DC converters for the other loads. Note that it is easier to find step-down DC/DC converters. Consider high efficiency DC/DC converters. Typically not less than 85%. Expensive ones have 90-95% efficiencies.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">John<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt">John F. DeBoever<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt">Global Projects Director – Renewable Energy<o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;color:maroon">Trojan Battery Company<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:8.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt">12380 Clark Street <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt">Santa Fe Springs, CA 90670<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR" style="font-size:9.0pt">Tel: +1-562-236-3000 Ext. 3139<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR" style="font-size:9.0pt">Cell: +1-514-514-7600 – Time Zone: EST USA (GMT-5)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt">Fax: +1-562-236-3239<o:p></o:p></span></p>
<p class="MsoNormal"><a href="mailto:jdeboever@trojanbattery.com"><span style="font-size:9.0pt">jdeboever@trojanbattery.com</span></a><span style="font-size:9.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;color:#984807;mso-style-textfill-fill-color:#984807;mso-style-textfill-fill-alpha:100.0%">NEW WEBSITE</span></b><span style="font-size:10.0pt;color:#984807;mso-style-textfill-fill-color:#984807;mso-style-textfill-fill-alpha:100.0%">
</span><span style="font-size:10.0pt;color:blue">- </span><a href="http://www.trojanbatteryre.com/"><span style="font-size:10.0pt">http://www.trojanbatteryre.com/</span></a><span style="font-size:10.0pt;color:blue"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt"><img border="0" width="191" height="55" id="Picture_x0020_4" src="cid:image001.jpg@01CC68C5.9AE4E580" alt="Description: Description: Description: Description: Description: Description: Description: cid:image001.jpg@01CB52C7.9D20C090"></span><span style="font-size:9.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> re-wrenches-bounces@lists.re-wrenches.org [mailto:re-wrenches-bounces@lists.re-wrenches.org]
<b>On Behalf Of </b>mac Lewis<br>
<b>Sent:</b> Thursday, September 01, 2011 3:52 PM<br>
<b>To:</b> RE-wrenches@lists.re-wrenches.org<br>
<b>Subject:</b> [RE-wrenches] unique battery bank design question<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hello wrenches,<o:p></o:p></p>
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<p class="MsoNormal">I have a battery bank questions. I have an Oil & Gas client interested in setting up an off-grid control system that has a various DC loads at 12VDC, 24 VDC and 48 VDC. My thought is to build a 48 V battery bank and tap off the bank at
various points to create a 12V bus, 24V bus and 48V bus. I am a bit concerned about unequal loading of the batteries. Has anyone dealt with something like this that would like to share some insight?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Thanks<br clear="all">
<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">-- <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Mac Lewis<b><span style="font-family:"Arial","sans-serif";color:#FF9900"><o:p></o:p></span></b></p>
<p><span style="color:#305A78">"Yo solo sé que no sé nada." </span><b><span style="color:#686868">-Sócrates</span></b><b><span style="font-family:"Arial","sans-serif";color:#FF9900"><o:p></o:p></span></b></p>
<p class="MsoNormal"><o:p> </o:p></p>
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