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Discussion Starter #1
I need to invest in a real battery pack for my EV.
Details (sorry to be repetitive for people who already
know my car and driving pattern).

93 Festiva 5 speed with KTA kit - 9" ADC motor, kit
battery racks that hold 16 golf cart batts (but really
only 15 because of where I put the controller),
originally a BC-20 charger, but I replaced it with 10
individual 6 A chargers (1 per battery). Curtis 72 -
120 V / 550 A controller. The car is bottomed out if
I put in even 13 golf cart size batts. No easy way to
beef up the suspension.

Driving habits - I need fast acceleration (and I have
it right now). Better than stock ICE to merge in and
out of heavy traffic. I need a real world every day
range of 8 miles at speeds of 35 - 45 MPH. I need to
be able to do that range even in cold weather in
Atlanta, GA (which really isn't that cold). I want
the batteries to last at least 2 years. I drive it
every day back and forth to work, 8 miles per day, 5
days per week, 50 weeks per year, for 2 years of use.
I can't charge at work.

In the past, the car ran on 96 V of Deka Group 24 AGM,
108 V of mixed AGM / flooded, 120 V flooded group 24
batts. Also, it used to run on 13 x 8 V of T-875's.
Right now, it has 10 Group 24, mixed AGM and flooded
(but charged individually). Some batts went bad.
That's why it is mixed.

Options:

8 x 12 V of Optima Yellow Tops (the small ones you can
get at Sam's Club for about $165 / ea).

12 X 8 V of flooded golf cart batts - Energizer. I
believe they are about $75 / ea.

10 x 12 Trojan flooded 12 V Group 24 batts. Which I
hear are the only good flooded batts in a Group 24
size. ??? on the price, but I think about $190 / ea.

Other suggestions????

I want something that will last and give good
performance without completely breaking the bank.

Thanks for the advice.

Steve



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Discussion Starter #2
a) I'd never mix batteries.
b) I'd be concerned about using AGM, spiral wound,
etc. without regs on them.
c) I'm using floodies, and think that for ease of
use, as well as raw amps, they're the best. You
mentioned that it had T875s, but I don't get the
impression _you_ got experience with them...
peace,

--- Steve Powers <[email protected]> wrote:

> I need to invest in a real battery pack for my EV.
> Details (sorry to be repetitive for people who
> already
> know my car and driving pattern).
>
> 93 Festiva 5 speed with KTA kit - 9" ADC motor, kit
> battery racks that hold 16 golf cart batts (but
> really
> only 15 because of where I put the controller),
> originally a BC-20 charger, but I replaced it with
> 10
> individual 6 A chargers (1 per battery). Curtis 72
> -
> 120 V / 550 A controller. The car is bottomed out
> if
> I put in even 13 golf cart size batts. No easy way
> to
> beef up the suspension.
>
> Driving habits - I need fast acceleration (and I
> have
> it right now). Better than stock ICE to merge in
> and
> out of heavy traffic. I need a real world every day
> range of 8 miles at speeds of 35 - 45 MPH. I need
> to
> be able to do that range even in cold weather in
> Atlanta, GA (which really isn't that cold). I want
> the batteries to last at least 2 years. I drive it
> every day back and forth to work, 8 miles per day, 5
> days per week, 50 weeks per year, for 2 years of
> use.
> I can't charge at work.
>
> In the past, the car ran on 96 V of Deka Group 24
> AGM,
> 108 V of mixed AGM / flooded, 120 V flooded group 24
> batts. Also, it used to run on 13 x 8 V of T-875's.
>
> Right now, it has 10 Group 24, mixed AGM and flooded
> (but charged individually). Some batts went bad.
> That's why it is mixed.
>
> Options:
>
> 8 x 12 V of Optima Yellow Tops (the small ones you
> can
> get at Sam's Club for about $165 / ea).
>
> 12 X 8 V of flooded golf cart batts - Energizer. I
> believe they are about $75 / ea.
>
> 10 x 12 Trojan flooded 12 V Group 24 batts. Which I
> hear are the only good flooded batts in a Group 24
> size. ??? on the price, but I think about $190 /
> ea.
>
> Other suggestions????
>
> I want something that will last and give good
> performance without completely breaking the bank.
>
> Thanks for the advice.
>
> Steve
>
>
>
>
>
____________________________________________________________________________________
> Fussy? Opinionated? Impossible to please? Perfect.
> Join Yahoo!'s user panel and lay it on us.
>
http://surveylink.yahoo.com/gmrs/yahoo_panel_invite.asp?a=7
>
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
>


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Discussion Starter #3
I wouldn't recommend Energizer brand batteries under any circumstances, nor
would I recommend 12v flooded batteries for a road EV - especially if you
drive it hard.

If you buy 8v batteries, go with Trojan or USBMC (Interstate Workaholic).
If you use 12v batteries, get AGMs, not ANY kind of flooded battery.

For your situation, the Optimas sound like a good choice, provided that you
can stomach the cost per mile of service life (compared to golf car
batteries).

BTW, you can remove the address [email protected] from you list. That's
the old address and is automatically forwarded to the new address,
[email protected] Sending an extra copy to the old listproc address just
sends a duplicate to the list.

David Roden - Akron, Ohio, USA
EVDL Administrator

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Discussion Starter #4
Load it up with as many of those John Wayland 14lb Hawkers as you can fit. ;)

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Discussion Starter #6
Joseph T. wrote:

> All the people above have recommended AGM batteries, but I think
> there's something you guys have forgotten:
> "I can't charge at work."
>
> Don't AGM batteires like to always be fully charged, like flooded
> batteries? If so this obviously wouldn't be a good choice.

But, he only has a 4mi commute to work, so the batteries will still be
sitting at a fairly high SOC, and they are only sitting like that for
8-12hrs. The 8mi round-trip should use about 50% of the available
capacity, so the batteries should be sitting at about 75%SOC for the
8-12hr workday.

The impact of leaving a lead acid battery partially charged gets worse
as the SOC decreases and the time it is left sitting increases. 75% is
a fairly high SOC and 8-12hrs is a fairly short time, so the impact is
likely to be small.

Indeed, for shallow discharges like this, it is possible that charging
at every opportunity will be worse for the battery since the battery
will tend to receive too much overcharge with most chargers due to
spending an unusually high percentage of the total charge time in the
finish phase).

Cheers,

Roger.

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Discussion Starter #7
> Don't AGM batteires like to always be fully charged, like flooded
> batteries? If so this obviously wouldn't be a good choice.

Actually, AGMs can tolerate partial discharge states for longer than
floodeds, but both can survive 50%DOD for many days, and at least many
hours at deeper discharge.

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