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Unread 09-18-2015, 12:53 AM   #1
Crazy Wild
 
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Default What is the interest in a complete lithium battery conversion kit

I've been thinking about converting to lithium. It seems there's a simple way and a not so easy way. You can buy a conversion kit or you can build it yourself. If you buy it ,it's big bucks, near bout $4000.00. If you build it, you better know you stuff or you can burn up a lot of money.
I buy lithium batteries from a manufacturer for another application and asked them if they can produce a 48V battery and they told me they can do that. The cost will be around $3000.00 for: 120amh 48v battery ,BMS, Anderson connector and charger. That does not include charge meter or battery mounting hardware.
Has anybody seen a better price for lithium conversion ?
Would anybody be interested in buying a lithium conversion at that price ?
I am thinking about selling these if there is enough interest.
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Unread 09-18-2015, 08:54 PM   #2
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Default Re: What is the interest in a complete lithium battery conversion kit

The ezgo txt pictured had 14 batteries at $118 each. The charger was another $350. Figure maybe $40 for materials. It's not the cheapest lithium conversion but it packed a heck of a punch and run time.

A look inside Nissan Leaf lithium battery pack

That is over in Extreme DC,
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Unread 09-18-2015, 09:52 PM   #3
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Default Re: What is the interest in a complete lithium battery conversion kit

Hi Mud,

I see that no one else is responding, so I'll give it a go. I have a primitive cart (CC DS - 1985 with resistor coil speed control). This cart was inherited from my wife's Grandmother.

I converted it to lithium three or four months ago. I am using CALB lithium iron phosphate cells. Not sure what chemistry you are going with in your system. Cost of my batteries was about $1/AH. I am using 13 cells for a voltage between 36 and 48. A 48 volt system would have cost me about $1600 for the cells and battery strap connectors. I have bottom balanced my cells within 1/100th of a volt, and am not using a BMS. Presently, I am using the original charger (36V Lester), and am having to cut-off manually at 45-46 volts. I am working on a automatic cutoff to terminate the charger power at 45 volts (3.5 volts per cell).

I think that $3,000 for a 48 volt 120 AH system with BMS and charger is a good price point; but there are many variables. Battery chemistry, warranty, BMS methodology are all factors. I am not a fan of BMS, but a reliable, economical system could convince me. Careful bottom balancing, and avoiding overcharging eliminate the need in my opinion. It works for me, but BMS would probably be required for a mass produced system.

Just my limited personal experience. I can tell you that I truly believe that Lead is Dead. Too heavy, too little cycle life, too little useful SOC. Long live lithium!

Jack

I am very happy with my lithium conversion; mostly because of greatly improved uphill performance. I also changed all my cables to 2 gauge, and installed a HD F/R switch from Scotty.
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Unread 09-20-2015, 08:26 AM   #4
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Default Re: What is the interest in a complete lithium battery conversion kit

I would like to see more about lithium power. I'm starting a new CC project and would like to go lithium, I'v to got buy new batteries anyway. Right now basically all it has is 4 12v (dead) wiring and a motor, everything else is missing.
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Unread 09-20-2015, 10:47 AM   #5
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Default Re: What is the interest in a complete lithium battery conversion kit

Do a search on BGW for lithium, and you will find several good threads. Most are using "Nissan Leaf" batteries. When I get a chance to take some pictures, and refine my cart a little more, I will document with a thread of my own.

Jack
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Unread 09-20-2015, 11:32 AM   #6
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Default Re: What is the interest in a complete lithium battery conversion kit

Thank you
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Unread 09-20-2015, 11:23 PM   #7
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Default Re: What is the interest in a complete lithium battery conversion kit

Thanks for the feedback. I understand you can DIY for a lot less. Not everybody has the ability or the time for this, so I was just throwing it out there to see if there was any interest in a turnkey system. There's a few websites that sell them, but they're round the $4K mark.
I was leaning toward DIY, but was hoping some my oversea sources could build them at a marketable price. That's not happening, but I'm not sure if I working the right sources. It seems to me they can be built for less. I going to give it another shoot, but communications is not easy, most no speak English and they are 12 hours ahead so it's late into the night for me.
Here I go.
Thanks, Muddog
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