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. www.surrette.com. 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! On Dec 19, 2013, at 1:28 AM, frenergy wrote:
> Gentlemen and women, > > 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. > > 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? > > 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. > > I appreciate any insights. > > Thanks in advance, > > Bill > <FRS_working_logo.jpg> > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Change email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > > t...@swnl.net www.SWNL.net > Solarwinds Northernlights > Serving Mid Coast Maine & Northern California > 207-832-7574 Cl. 610-517-8401 > > Blair "TUMP" May > ******** MAINE'S CHARTER ******** > NABCEP "Certified PV Installer" > > ******** MAINE'S CHARTER ******** > Trace Xantrex "Certified" Dealer / Installer" >
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