<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Has anyone tried using a battery management system (BMS) like those used on electric vehicle battery banks? Here is an example:<div><a href="http://www.manzanitamicro.com/products?page=shop.product_details&flypage=flypage.tpl&product_id=87&category_id=22">http://www.manzanitamicro.com/products?page=shop.product_details&flypage=flypage.tpl&product_id=87&category_id=22</a></div><div><br><div apple-content-edited="true">
<span class="Apple-style-span" style="border-collapse: separate; font-size: 12px; border-spacing: 0px; "><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Times New Roman" size="3" style="font: normal normal normal 12px/normal 'Times New Roman'; ">Randy Brooks</font></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Times New Roman" size="3" style="font: normal normal normal 12px/normal 'Times New Roman'; ">Brooks Solar, Inc.</font></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Times New Roman" size="3" style="font: normal normal normal 12px/normal 'Times New Roman'; "><b><i>Solar Power for People</i></b></font></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Times New Roman" size="3" style="font: normal normal normal 12px/normal 'Times New Roman'; ">140 Columbia View</font></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Times New Roman" size="3" style="font: normal normal normal 12px/normal 'Times New Roman'; ">Chelan, WA<span class="Apple-converted-space"> <span class="Apple-converted-space"> </span></span>98816</font></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Times New Roman" size="3" style="font: normal normal normal 12px/normal 'Times New Roman'; ">509-682-9646</font></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Times New Roman" size="3" style="font: normal normal normal 12px/normal 'Times New Roman'; "><a href="mailto:Randy@BrooksSolar.com">Randy@BrooksSolar.com</a></font></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Times New Roman" size="3" style="font: normal normal normal 12px/normal 'Times New Roman'; "><a href="http://www.BrooksSolar.com">www.BrooksSolar.com</a></font></p></span>
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<br><div><div>On Mar 15, 2013, at 8:05 PM, Dan Fink <<a href="mailto:danbob88@gmail.com">danbob88@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">This has been happening all too frequently here. We live in a big area<br>of off grid homes, dozens of systems.<br>Lost a customers Trace 2624 this morning; One L-16 in older 24v bank<br>opened internally. PV array/MPPT control zorched inverter as soon as<br>the sun came up. First indication of problems last nite when customer<br>hit microwave to warm up dinner and inverter went crazy. This morning<br>the bad battery showed 3.2v (yes, I would expect 2 or 4 also) the rest<br>the usual 6+v. Turned on PV array, bad battery immediately up to 11v<br>(yes, 6v L16).<br><br>Somebody needs to build a "battery condom" with big stacked diodes on<br>a big heat sink or some such solution. A voltage brick wall for system<br>charging inputs. MPPT PV controllers do NOT protect a inverter from<br>input overvoltage if all or part of the battery bank disappears! And<br>last year we saw a nice battery box fire and zorched inverters due to<br>similar -- dual 48v L16 strings, one cell failed and opened, other<br>string dumped everything into the bad one, smoke and flames. Parallel<br>fusing would have stopped that......but not stopped the loss of dual<br>stacked XW inverters from PV overvoltage.<br><br>Or am I missing something here?<br><br>Dan Fink,<br>Executive Director;<br>Otherpower<br>Buckville Energy Consulting<br>Buckville Publications LLC<br>NABCEP / IREC accredited Continuing Education Providers<br>970.672.4342<br>_______________________________________________<br>List sponsored by Home Power magazine<br><br>List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a><br><br>Change email address & settings:<br><a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br><br>List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org<br><br>List rules & etiquette:<br>www.re-wrenches.org/etiquette.htm<br><br>Check out participant bios:<br>www.members.re-wrenches.org<br><br></blockquote></div><br></div></body></html>