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<p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1F497D">Bill<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1F497D">With 4 parallel strings at 6 years you surely will have some bad cells. I would let the bank sit (with no load or charge) for at least 8 hours, or if you can 24 hours and simply
do a voltage check. You can’t get a good 6 volt battery below 6 volts (at rest) so eliminate the 4 lowest voltage batteries and EQ the other 3 strings individually (check voltage after to make sure that they did equalize) all batteries should now be equal
voltage, if not, wait and EQ again.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1F497D">You can call me Toll Free 888-895-8179 with questions.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:black">Kind regards<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#006600"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-family:"Arial","sans-serif";color:#006600">Tom Duffy<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-family:"Arial","sans-serif";color:#006600">Senior Solar Design Engineer<o:p></o:p></span></b></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> re-wrenches-bounces@lists.re-wrenches.org [mailto:re-wrenches-bounces@lists.re-wrenches.org]
<b>On Behalf Of </b>Tump<br>
<b>Sent:</b> Thursday, December 19, 2013 6:52 AM<br>
<b>To:</b> RE-wrenches<br>
<b>Subject:</b> Re: [RE-wrenches] Sick pack<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">What is the Spg (use a good refractometer)of each cell 1.11?1.15? that temp is not to hi especially w/ the temp comp. Charging w/ the unit in bulk, the inverter will see voltage rise quickly and decide that they are charged. disconnect
the batteries and check as individual units Eq at high voltage `32 v and a low charge rate 10 amps, watch the temp Spg . I would suggest that if at all possible remove 2 sets and eq from the grid for ~week on /off.DO use a temp sensor and watch the spg. See
Surrette's tech bulletin re/ highly sulfated batteries. <a href="http://www.surrette.com">
www.surrette.com</a>.<o:p></o:p></p>
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<p class="MsoNormal">Anything over 2 strings will cause a headache, BUT thats more the norm w/ the cheep off grid, I'm going to manage my gen run time kinda of folks!<o:p></o:p></p>
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<p class="MsoNormal">On Dec 19, 2013, at 1:28 AM, frenergy wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Times","serif"">Gentlemen and women,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Times","serif""> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Times","serif""> I have been called in to deal with a pack of 16 (4 strings of 4 for 24V), L-16s, 6 years old. She is having to run her generator 2 times a day. Here in N.E. CA. its been
cold, mostly clear, little wind. Her inputs are about 1 KW of PV, and small wind machine and of course a serious generator. Cables and terminals looked clean, were tight. The bulk setting on the Trace 4024 was 28.0 V for 2 hrs with RTS, however, she would
manually turn off the generator soon after it reached 28V. Recipe for suphation.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Times","serif""> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Times","serif""> Rather than getting into too much detail, here's my quandary. When I fired up the generator, the input amps in each of the 4 strings were.... string #1:29A, 2:34 A, 3:25
A, 4: 13 A. A survey of IR temps throughout the pack gave temps ranging from 63 to 92 degrees. The highest temps were in the string pulling highest amps. In trying to find shorted/failed and/or sulphated cells which data are most relevant? Temps, amp draw
during charge, disconnect strings from each other and check volts of each 6 volt batt?, active bubbling? ...all the above? <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Times","serif""> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Times","serif""> I'm thinking I should have (1) checked the amp draw with batts under load/genny off in each string AND (2) check amps between strings with the pack at rest, no input or
output. I would love to EQ the pack but with a temp already in the 90's and uneven currents in the strings I don't want to risk too high of temp or worse, a runaway situation and fire. I'm thinking I'd like to yank a few bad batts and run on 3 strings and
then carefully EQ. <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Times","serif""> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Times","serif"">I appreciate any insights.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Times","serif""> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Times","serif"">Thanks in advance,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Times","serif""> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Times","serif"">Bill<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;color:black"> </span><span style="font-size:9.0pt;color:#2D2CFA"> </span><span style="font-size:13.5pt;color:#2D2CFA">Solarwinds Northernlights</span><span style="font-size:9.0pt;color:black"> <i> </i></span><span style="font-size:9.0pt"><o:p></o:p></span></p>
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