<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Brian:</div><div><br></div><div>I don't have the PV details handy but I will provide them. </div><div><br></div><div>Question: will a sulfated cell exhibit a SG of 1.26? I thought a sulfated cell locked the acid onto the plates, minimizing the SG readings below that of a healthy cell. 1.26 is a relatively high reading. </div><div><br></div><div>William</div><div><br>On Jul 23, 2013, at 1:28 PM, Brian Teitelbaum <<a href="mailto:bteitelbaum@aeesolar.com">bteitelbaum@aeesolar.com</a>> wrote:<br><br></div><blockquote type="cite"><div><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"><meta name="Generator" content="Microsoft Word 14 (filtered medium)"><!--[if !mso]><style>v\:* {behavior:url(#default#VML);}
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</o:shapelayout></xml><![endif]--><div class="WordSection1"><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">William,<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">What does the PV array consist of? What size and type, and how many, modules?<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">Which TriStar? 45 or 60A?<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">What controller did she have before the upgrade?<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">The high charging voltage might be a sign of sulfation. Depending on her load profile, that 8A charge rate might have caused chronic undercharging. In a 5 peak sun-hour location, that’s only 40Ah/day of charging capacity.<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">Brian Teitelbaum<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">AEE Solar<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><div><div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in"><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""> <a href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a> [<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org">mailto:re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On Behalf Of </b>William Miller<br><b>Sent:</b> Tuesday, July 23, 2013 1:13 PM<br><b>To:</b> RE-wrenches<br><b>Subject:</b> [RE-wrenches] Tri-Star MPPT<o:p></o:p></span></p></div></div><p class="MsoNormal"><o:p> </o:p></p><div><p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">Friends:</span><o:p></o:p></p></div><div><p class="MsoNormal"> <o:p></o:p></p></div><div><div><p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">I have a customer with a new Tristar MPPT controller. The customer has some older L-16 batteries mixed with new and she thinks the controller has damaged her batteries. I am trying to convince her that the batteries were already damaged and mixing old with new is a bad idea.</span><o:p></o:p></p></div><div><p class="MsoNormal"> <o:p></o:p></p></div><div><p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">I removed the worst batteries from the array, leaving one string of older batteries with reasonable SG readings. The CC still acts strangely: When programmed to charge the L-16 batteries, the battery voltage shoots up to 30.2 volts and the batteries boil a lot. The green light on the controller blinks at variable rates, at one moment fast, the next slow, the next solid.</span><o:p></o:p></p></div><div><p class="MsoNormal"> <o:p></o:p></p></div><div><p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">I believe the client started with bad batteries, 6 are 4 years old, 2 are 1 year old. She is convinced that the CC damaged her batteries. She replaced panels and CC recently, installing the Tristar. I believe the old PV system charged at such a slow rate (8 amps) that the battery deficiency was not apparent. The higher charging rate has emphasized the problem.</span><o:p></o:p></p></div><div><p class="MsoNormal"> <o:p></o:p></p></div><div><p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">Any one have any thing to add to my theory?</span><o:p></o:p></p></div><div><p class="MsoNormal"> <o:p></o:p></p></div><div><p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">Thanks in advance.</span><o:p></o:p></p></div><div><p class="MsoNormal"> <o:p></o:p></p></div><div><p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">William Miller</span><o:p></o:p></p></div><div><p class="MsoNormal"> <o:p></o:p></p></div><div><p class="MsoNormal"> <o:p></o:p></p></div></div><div><p class="MsoNormal"> <o:p></o:p></p></div><p class="MsoNormal"><image002.jpg><o:p></o:p></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">17395 Oak Rd. Atascadero, CA 93422</span><o:p></o:p></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif""><a href="http://www.millersolar.com/">www.millersolar.com</a></span><o:p></o:p></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">805-438-5600 voice*</span><o:p></o:p></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">*Note: above number replaces cell number</span><o:p></o:p></p><div><p class="MsoNormal"> <o:p></o:p></p></div></div></div></blockquote><blockquote type="cite"><div><span>_______________________________________________</span><br><span>List sponsored by Home Power magazine</span><br><span></span><br><span>List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a></span><br><span></span><br><span>Change email address & settings:</span><br><span><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></span><br><span></span><br><span>List-Archive: <a href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a></span><br><span></span><br><span>List rules & etiquette:</span><br><span><a href="http://www.re-wrenches.org/etiquette.htm">www.re-wrenches.org/etiquette.htm</a></span><br><span></span><br><span>Check out participant bios:</span><br><span><a href="http://www.members.re-wrenches.org">www.members.re-wrenches.org</a></span><br><span></span><br></div></blockquote></body></html>