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Success with first electric go kart project (pics)
#1
I am currently modifying a Drifter go kart by replacing the existing 24 V lead acid (14 amp hour) battery with a home made 24 V (7 series 2 parallel) 18650 battery pack. The batteries were purchased from ***** and arrived in perfect condition as usual. The 7S2P Pack is intentionally small so I can learn the basic issues of electric go karts.
The only change I am making is swapping out the battery. All other connections to the original charge controller (30 amp max) remain unchanged (throttle, charger, breaks, etc).
Everything worked well. It took a while to solder the XT60 connectors (I am new at this) but the motor runs well using the existing controller. I conducted several “test runs” with the go kart on the work bench and all worked well. The wires, BMS, and battery all remained cool during several tests. I will conduct a “road test” tommorow by reassembling the rest of the go kart and taking it for a slow and short ride. This is a very small project that I am using to learn the basics.
This hobby regarding electric powered stuff is awesome. I just need more time and money to keep it going. ?
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#2
You can't use the existing lead acid charger and you should look into the power draw from the electric motor / motor controller. With only 2p you might be overloading your cells.
Oderus420 likes this post
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#3
(12-10-2017, 03:07 PM)DarkRaven Wrote: You can't use the existing lead acid charger and you should look into the power draw from the electric motor / motor controller. With only 2p you might be overloading your cells.

Thanks. I will do that. I appreciate the feedback. I only charged it up to about 26 Volts but you are correct that it may be too much power for the cells.
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#4
PICS? did you forget the photos of your Go Kart?
we like pics
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#5
Depending on size of motor and type of cells 2p sounds way to small in my ears too.

Pictures!
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#6
Thanks for the feedback. I will find the correct charger soon. The battery is wrapped in kapton tape and the “battery box” is just cardboard with some electrical tape. You can not see it from the photos but I re-installed the motor/charge control cover so the chain would not be exposed.  This is all very temporary since I will likely upgrade to a 36v motor/controller with a 10s/4P battery pack (and a much better battery case”).  Thanks again for all the feedback. This forum is awesome.

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#7
Definitely looks well suited for a lithium conversion but you should check the specs of the motor asap and compare these to the specs of the cells you have used.
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#8
Thanks. I researched the motor and it is 24V 250W with 10 tooth sprocket. My battery pack is 7S so my nominal battery voltage is 25.9V.  The Amp Hours of my battery pack is 7.0 so the capacity is half of the original lead acid batteries. This becomes noticeable when I drive the Go Kart (I weigh 150 pounds) instead of my son (80 pounds). I could add more 18650 batteries but I want to save them for the upgrade to a 36v motor/charge controller. It has been a great experience and I am eager to learn more.  Smile
Everythings-stuck-together likes this post
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#9
10A easy. Ie 5A per cell. Unless you got high current cells you definitely need to add more cells because otherwise you will kill your cells Smile
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#10
Yes exactly, you need more cells. Or high drain cells. Or both Smile

You can see the effects already, you say the lower capacity becomes noticeable when you drive the kart. It has nothing to do directly with the capacity, but with the voltage drop under load. You're giving your cells a hard time and they simply can hold the voltage up. I guess you have been using new 3500mAh cells then? The high capacity cells aren't suited for high currents usually, you would achieve better results with cells suitable for the task at hand. For example, high drain cells with 2500mAh will probably give you a better performance although the capacity goes down from 7Ah to 5Ah.

Without knowing what cells you have exactly I guess something like 5p would be much more fitting. If you want high capacity and high discharge, more or less, then look at the LG HG2 cells. 3000mAh cells with 20A continuous discharge, they would be very well suited for the job.
You can either add more cells or switch to high drain cells. Or do both, a higher number of high drain cells will obviously be beneficial as well. RC LiPos would also work very well.
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