Hello Bryan,
Make sure when you have the spare batteries in storage, put battery
maintainers on them. Setting a long time with out maintainers, the negative
plates could have more sulfate build up on them, thus it takes a longer
charge time. You can get these maintainers from batteries shops.
I have maintainers on all my store batteries. I put a maintainer on a deep
cycle marine 12 volt battery that was in a Cam Am race car that was
converted to a sports car back in 1973 that was in storage. I took it out
of the box last year, service the car and the battery still can turn over
the engine way lot longer than a standard cranking battery. Sold it to a
friend of mine who has a collection of these type of cars, and the battery
is still turning over the engine today.
Also check the manufacture dates on all your batteries, at one time the
dealer slip in 10 batteries that were about a year old with the other 20
batteries that was only a month all. I made him replace all the other 10
batteries.
In the northern country, the dealers buy pallet loads of batteries in the
spring to get ready the golf season, so that's the time to purchase them so
you get a pack with all the same manufacture dates.
After 6 years, I'am still running Trojan's T-145's between 0.01 to 0.02 volt
difference between all the batteries and that's without any BMS and plan to
get another 6 years out of them.
Roland
----- Original Message -----
From: "Bryan" <[email protected]>
To: "EV List" <[email protected]>
Sent: Sunday, September 09, 2007 12:11 AM
Subject: [EVDL] need some help interpretting odd charging behavior
> I'm experiencing some odd battery behavior and I'm hoping perhaps
> someone can provide some expert advice to interpret what I'm seeing. I
> originally started with 28 batteries, however have only installed 24 due
> to space limitations. The twenty-four batteries that were installed in
> the car have been charged & discharged occasionally over the past year
> but for the most part the car has just been sitting during that time and
> so the batteries maybe got around a dozen cycles during that period. I
> managed to toast one of the batteries due to some carelessness on my
> part and replaced it with one of the "extra" batteries that had been
> sitting completely unused for that entire time. For the past month or
> so I have been driving the car on a daily basis without any trouble, but
> that new battery seems to require a bit of extra attention when charging
> and I'm trying to figure out if the problem is with the new battery or
> with the other batteries. Now, today, I seem to have a second battery
> that is behaving just like the new battery. When charging the full
> pack, these two batteries never seem to charge more slowly. By the time
> the rest of the batteries have reached a full charge and the regs are
> merrily blinking away at their 14.8V limit, these two batteries are
> still only at around 13.3-13.4 volts. I can connect them to my 12V
> charger to charge them individually and the voltage seems to come up
> just fine. It's only when charged in the full string that they seem to
> be obstinate. The weird thing though is that if I disconnect the
> charger and come back to check the resting voltage later, these two
> batteries are still at around 12.87 volts or so, which is a hair lower
> than the other batteries but still within 0.05V and apparently fully
> charged.
>
> So.... Which batteries are functioning properly? Is the entire rest of
> my pack coming up to the 14.8V max voltage too quickly, and these two
> are the only batteries working correctly? A sign of sulfation maybe??
> Or is the majority of my pack fine and it's just these two individual
> batteries that are acting up? Any explanations for exactly what might
> be going on here and what to do to get all of the batteries charging in
> a uniform manner?
>
>
> Thanks in advance for any help/advice.
>
> -Bryan
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
>
_______________________________________________
For subscription options, see
http://lists.sjsu.edu/mailman/listinfo/ev
Make sure when you have the spare batteries in storage, put battery
maintainers on them. Setting a long time with out maintainers, the negative
plates could have more sulfate build up on them, thus it takes a longer
charge time. You can get these maintainers from batteries shops.
I have maintainers on all my store batteries. I put a maintainer on a deep
cycle marine 12 volt battery that was in a Cam Am race car that was
converted to a sports car back in 1973 that was in storage. I took it out
of the box last year, service the car and the battery still can turn over
the engine way lot longer than a standard cranking battery. Sold it to a
friend of mine who has a collection of these type of cars, and the battery
is still turning over the engine today.
Also check the manufacture dates on all your batteries, at one time the
dealer slip in 10 batteries that were about a year old with the other 20
batteries that was only a month all. I made him replace all the other 10
batteries.
In the northern country, the dealers buy pallet loads of batteries in the
spring to get ready the golf season, so that's the time to purchase them so
you get a pack with all the same manufacture dates.
After 6 years, I'am still running Trojan's T-145's between 0.01 to 0.02 volt
difference between all the batteries and that's without any BMS and plan to
get another 6 years out of them.
Roland
----- Original Message -----
From: "Bryan" <[email protected]>
To: "EV List" <[email protected]>
Sent: Sunday, September 09, 2007 12:11 AM
Subject: [EVDL] need some help interpretting odd charging behavior
> I'm experiencing some odd battery behavior and I'm hoping perhaps
> someone can provide some expert advice to interpret what I'm seeing. I
> originally started with 28 batteries, however have only installed 24 due
> to space limitations. The twenty-four batteries that were installed in
> the car have been charged & discharged occasionally over the past year
> but for the most part the car has just been sitting during that time and
> so the batteries maybe got around a dozen cycles during that period. I
> managed to toast one of the batteries due to some carelessness on my
> part and replaced it with one of the "extra" batteries that had been
> sitting completely unused for that entire time. For the past month or
> so I have been driving the car on a daily basis without any trouble, but
> that new battery seems to require a bit of extra attention when charging
> and I'm trying to figure out if the problem is with the new battery or
> with the other batteries. Now, today, I seem to have a second battery
> that is behaving just like the new battery. When charging the full
> pack, these two batteries never seem to charge more slowly. By the time
> the rest of the batteries have reached a full charge and the regs are
> merrily blinking away at their 14.8V limit, these two batteries are
> still only at around 13.3-13.4 volts. I can connect them to my 12V
> charger to charge them individually and the voltage seems to come up
> just fine. It's only when charged in the full string that they seem to
> be obstinate. The weird thing though is that if I disconnect the
> charger and come back to check the resting voltage later, these two
> batteries are still at around 12.87 volts or so, which is a hair lower
> than the other batteries but still within 0.05V and apparently fully
> charged.
>
> So.... Which batteries are functioning properly? Is the entire rest of
> my pack coming up to the 14.8V max voltage too quickly, and these two
> are the only batteries working correctly? A sign of sulfation maybe??
> Or is the majority of my pack fine and it's just these two individual
> batteries that are acting up? Any explanations for exactly what might
> be going on here and what to do to get all of the batteries charging in
> a uniform manner?
>
>
> Thanks in advance for any help/advice.
>
> -Bryan
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
>
_______________________________________________
For subscription options, see
http://lists.sjsu.edu/mailman/listinfo/ev
