Thanks everyone for the replies and ideas both on and off list.
Based on your input, next week when the system is in Float I plan to have
the class isolate the faulty battery and measure voltage, let it rest for a
couple days, then load test at about C/10. Predicted result is that it will
show ext
Having one cell die seems to be an emerging pattern.
At 09:49 AM 11/22/2015, you wrote:
Esteemed Wrenches;
I'm looking for input on what could be going on
with a battery bank at the college I teach for.
It's a stand-alone system with 4 Trojan 12v
T-1275 in series / parallel for 24v, 660w of
Yes, Bill, but it seems that the manufacturers are over eating as the excrement
is happening with much greater frequency. It’s interesting that I’m not seeing
this problem with the Trojan T-105 Plus. We sell about 3 pallet loads of those
each season.
Larry
On Nov 23, 2015, at 9:25 AM, Feather
T-1275’s are golf cart
Bill Dorsett
Manhattan, KS
From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf
Of RE Ellison
Sent: Monday, November 23, 2015 10:36 AM
To: RE-wrenches
Subject: Re: [RE-wrenches] Odd battery problem - very low SG in only one cell
I have
Dan, Larry,
I just had a S-460 do exactly the same thing, bank of 8, good
maintenance, light usage, one battery with 2 cells at 1.270, one at
"zero" Surrette was low hassle and prompt with free replacement.
As someone notable once said "excrement occurs".
Bill
On 11/23/20
I have seen a high number of Trojan L 16's losing single cells for no apparent
reason
Probably starting five or six years ago
Many on battery banks for the people that had banks previously and gotten 10 or
12 years life out of them so I wouldn't expect anything different on the
replacements
Al
Dan,
Last week I had a 3+ year old Trojan L16H-AC with one dead middle cell, SG
shows water. The bank has 8 batteries and the customer is diligent about
maintenance and charging. I wish I knew why this happens but it seems over the
last few years like there is a pattern with Trojan L16’s.
L
Hi Dan,
No definitive suggestions, but kudos for making it a learning experience
for _all_. Great analytical technique. Hopefully you gain more
credibility with the kids as a result of your candor.
Bill Loesch
Solar 1 - Saint Louis Solar
314 631 1094
On 11/22/2015 8:49 AM, Dan Fink wrote:
E
Batteries will fail, 2 volt cells are easily replaced your, not so w/your 12
volt cell, thats the whole battery. What causes it? usually its a manufacture
issue. bad weld on the plates, poor forming of the plates in the cell. I have
seen this many times where there IS voltage but no Spg. You wer
attery problem - very low SG in only one cell
Esteemed Wrenches;
I'm looking for input on what could be going on with a battery bank at the
college I teach for. It's a stand-alone system with 4 Trojan 12v T-1275 in
series / parallel for 24v, 660w of PV, running only a drainback solar
Hi dan
Assuming all charge settings correct, it's a manufacturing fault.
I couldn't tell if the other lower SG readings were in the same battery or not.
I just replaced a 1 yr old HUP, cell.
Now as to what, why, how it failed, that's a good mystery
Jay
> On Nov 22, 2015, at 6:49 AM, Dan
Esteemed Wrenches;
I'm looking for input on what could be going on with a battery bank at the
college I teach for. It's a stand-alone system with 4 Trojan 12v T-1275 in
series / parallel for 24v, 660w of PV, running only a drainback solar hot
water system for space heating. So, 3 pumps and 3 DTCs,
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