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Unread 07-18-2014, 02:34 PM   #41
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Default Re: LiFePo4 batteries

You can't compare the two types of batteries strictly by amp hour rating. It's not an apples to apples kind if thing. My cart, with these batteries will run at full speed (no voltage drop) for a longer time then when the lead acids were in it. I know, it doesn't sound right, but it is.
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Unread 07-19-2014, 12:03 PM   #42
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Default Re: LiFePo4 batteries

The LFP cells definitely do have a higher upfront cost than lead acid batteries (a general estimate is that the lithium systems should be about $700 per kWh of power). But as most know they have great cycle life (2000+ at full 100% DODs). Even after this "rated" cycle life you still have 80% or more of the capacity left which is still plenty of juice. And unlike the lead acid, after this 80% rate life the capacity continues to decrease at a linear rate so you can definitely continue to use the batteries and not worry about them just “dying” in a few more cycles.
What's key is to make sure the BMS attached to the cells is keeping things in check. With the LFP cells and a proper BMS, the system should be pretty robust, not need any maintenance and run for years.
When sizing the systems the lead acid batteries are always oversized. It's one way to help make sure the cells aren't overdischarged and help provide a "decent" cycle life. Also, when they mention 170Ah capacity it's usually at a pretty low discharge rate (C/5). Peukert's law really comes into play with lead acid batteries. With the loads we saw in Barbers cart there is no way you would get anywhere close to 170Ah of capacity from the batteries.
I saw the post of $2400 for a lithium system. If it's constructed with cells from a good manufacturer and includes the BMS then that's a pretty fair price. Yes, it's higher than top quality lead acid but it will also outperform and definitely outlast the lead acid system by 3-4X easily.
Right now, isn’t in the business of selling cart systems on the market. Our company focuses on larger OEMs. But I'm hoping the LFP system we put into Barber's cart can help others understand the benefits and I'll definitely try to answer any questions people have about lithium battery systems.
I know seeing his cart cruise around the neighborhood has created a lot of envy with the other cart owners.
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Unread 07-26-2014, 05:37 PM   #43
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Default Re: LiFePo4 batteries

Quote:
Originally Posted by jjance View Post
I don't see why anybody would consider putting a 60 or even a 100 ah battery pack in their cart. The cheap US Batteries that I use are rated at 170 ah. Why would you want to pay twice as much for half the power?
because lithium-ion battery Ah is at the 1 hour rate. Golf cart batteries like Trojan, US Battery, Crown, etc... are spec'd at the 20 hour rate. Apples to oranges.

I installed a 48v 120Ah lithium pack in a ezgo txt, lifted with 25" tires, Alltrax and D&D motor. It has a 35 mph top speed and I get 42 miles per charge. That is WAY better the FLA and the performance increase is substantial.

Here's my thread and picture. I am considering selling it to build a 60 mile range cart.
Long Travel lift front & rear, Lithium powered TXT build

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Unread 07-26-2014, 06:18 PM   #44
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Default Re: LiFePo4 batteries

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Originally Posted by sportcoupe View Post
because lithium-ion battery Ah is at the 1 hour rate. Golf cart batteries like Trojan, US Battery, Crown, etc... are spec'd at the 20 hour rate. Apples to oranges.

I installed a 48v 120Ah lithium pack in a ezgo txt, lifted with 25" tires, Alltrax and D&D motor. It has a 35 mph top speed and I get 42 miles per charge. That is WAY better the FLA and the performance increase is substantial.

Here's my thread and picture. I am considering selling it to build a 60 mile range cart.
Long Travel lift front & rear, Lithium powered TXT build

Sportcoupe give us an idea of the cost of your conversion including charger.
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Unread 07-26-2014, 06:23 PM   #45
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Default Re: LiFePo4 batteries

Quote:
I installed a 48v 120Ah lithium pac
Since we can't compare apples to oranges with lead-acid and Li batteries. With the batteries in quotes above what is your KwH rating of your battery pack?
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Unread 07-26-2014, 06:27 PM   #46
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Default Re: LiFePo4 batteries

A little info I found about price while looking at Sportcoupe's build.

http://hybridautocenter.com/HAC4/ind...0ah&Itemid=605
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Unread 07-26-2014, 08:24 PM   #47
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Default Re: LiFePo4 batteries

My batteries were $118 each shipped from above link. I have 14 of them in a 2 parallel, 7 series arrangement for 120Ah and 59v charged voltage, just 1 volt under the max for Alltrax. Charger was specifically programmed for lithium and comes from QC and was around $324.
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Unread 07-26-2014, 08:32 PM   #48
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Default Re: LiFePo4 batteries

Quote:
Originally Posted by jjance View Post
Since we can't compare apples to oranges with lead-acid and Li batteries. With the batteries in quotes above what is your KwH rating of your battery pack?
I have no idea.
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Unread 07-27-2014, 07:52 AM   #49
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Default Re: LiFePo4 batteries

GCT_Cooper,

Do the lithiums still perform better under high discharge rates. My cart seldom is run on pavement. Come hunting season it's in the woods, crawling over logs and thru mudholes, all while hauling 3-4 people and 2-300 additional pounds.
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Unread 07-27-2014, 08:25 AM   #50
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Default Re: LiFePo4 batteries

It's just biting the bullet with that one time cost that hurts lol. I fully believe these are awesome but for the majority too much initial cost to get started.
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