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Unread 12-16-2015, 11:37 AM   #41
Gone Wild
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Default Re: Battery options

I agree that a BMS is necessary if you want to get decent battery life and use much of the available capacity. I plan to use a BMS for sure - and be conservative on the Over and Under Charge voltages.
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Unread 12-16-2015, 12:16 PM   #42
MC1
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Default Re: Battery options

some of the other forums where I am a member (boats, Jeeps, fishing) we occasionally do a "group buy" for items that show a lot of interest but may be just outside the purchase $$ limits.

This seems like something to consider for a Lithium pack. Wondering if we can get several of us together and approach Nick (who does the Leaf packs) about a special price if we agree to buy several packs of his drop in 60AH and 120Ah if we can order some.

Let me know if that sparks some interest, I'll be happy to be the one to spearhead the efforts.

One thing about "group buys"- many people say "I'm in" but never commit with $$$$.
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Unread 12-16-2015, 01:48 PM   #43
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Default Re: Battery options

I would be up for a group buy. I have been saving and researching for a while now.

When I make the change, I will be going with a 180ah+ pack at 70-80 volts.

The only reason for the 180ah pack is the discharge ratings. The leaf cells are only good for 240 amps according to Hybridauto center. I need (WANT) to be able to use the full rating on my Alltrax SPM72650, in peak amp mode it can pull 740amps, so I need 3 parallel strings of 20 cells to be able to have the maximum fun available. I would need 30 leaf modules.

The extra amp hours would be nice on hunting trips also.
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Unread 12-16-2015, 01:50 PM   #44
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Default Re: Battery options

As it is now I can only get 450-500 amps from my 12volt GC batteries with a huge amount of voltage drop.

My lead acid batteries drop close to 25 volts at 450-500amps, A 180ah lithium pack will only drop 5-8 volts.
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Unread 12-16-2015, 01:53 PM   #45
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Default Re: Battery options

Leaf cells in 120AH config will deliver 500 amps burst.
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Unread 12-17-2015, 08:54 AM   #46
MC1
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Default Re: Battery options

FWIW-

here is the new pack that is a drop in.

http://hybridautocenter.com/HAC4/ind...-15&Itemid=605

I sent him a note about what price he'd give if we'd buy 5-10 of these as a group.
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Unread 12-17-2015, 12:24 PM   #47
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Default Re: Battery options

Quote:
Originally Posted by Volt_Ampere View Post
Leaf cells in 120AH config will deliver 500 amps burst.
But how long is "burst" before the cells BURST, or just die. I know discharging them at 500 amp will shorten their life. What would the voltage drop be?

I would rather keep them within a known safe range.
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Unread 12-17-2015, 02:41 PM   #48
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Default Re: Battery options

The 240 amp continuous (4C) is for a 60Ah pack I believe. If you setup a 120Ah pack then is should be ~ double at 480 amp.

I just bought a 16 module setup from hybrid auto center.
So we shall see in the long run.
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Unread 12-17-2015, 05:23 PM   #49
MC1
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Default Re: Battery options

So maybe i simplify this at bit.

For someone who is going to drive their cart at the upper limits of the speed capacity and wants the "best" run times

Lithium 120ah is the 1st choice
Lithium 60ah is the next chioce
Lead Acid 6-8v is a close second to the 60ah
Lead Acid 4-12v is just not the way to go.

Now if i can just get that Flux-capacitor working, power source would not be a concern. Anyone have the email for Doc?
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Unread 12-18-2015, 02:19 PM   #50
MC1
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Default Re: Battery options

In think this is what is the best choice. As with a choice there are compromises.

I'll do the 6-8v conversion and go with Deka batteries.

Put 4 gauge (maybe 2 gauge) new cables.

Remove the OBC and use a lester summit onboard charger.

Anyone think I'm making a mistake?
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