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<div class="moz-cite-prefix">You can waste lots of time trying to
save an already dieing set of batteries, or just cut to the chase
and install a new set. L16s are not a long life battery. While
some folks can baby them and get 10 years, I've seen failures at
less than 5 years. Compare cycle life; most L16s are only 600
cycles to 80% DOD. The new Trojan RE series are 1000 cycles to
80% DOD, but you're also up against the too many parallel string
issue, which always contributes to unequal charging and early
battery failure. They need a forklift type (2v cells) battery.
HUP Solar One, Crown, Trojan Industrial, or Rolls all make
batteries that are what you need.<br>
<br>
<pre class="moz-signature" cols="72">R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760</pre>
On 12/19/2013 6:52 AM, Tump wrote:<br>
</div>
<blockquote cite="mid:10D540AC-9962-4E26-BCE0-43FA3B24E32C@swnl.net"
type="cite"><base href="x-msg://12/">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 moz-do-not-send="true"
href="http://www.surrette.com">www.surrette.com</a>.
<div>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!
<div>
<div>
<div>On Dec 19, 2013, at 1:28 AM, frenergy wrote:</div>
<br class="Apple-interchange-newline">
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<div>Gentlemen and women,</div>
<div> </div>
<div> 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.</div>
<div> </div>
<div> 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? </div>
<div> </div>
<div> 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. </div>
<div> </div>
<div>I appreciate any insights.</div>
<div> </div>
<div>Thanks in advance,</div>
<div> </div>
<div>Bill</div>
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