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Unread 07-30-2014, 08:51 AM   #61
Not Yet Wild
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Default Re: LiFePo4 batteries

There should really be some sort of low voltage cut off system as well to prevent over discharge during use in the cart. Which also would need a voltage indicator or low voltage warning to the driver so they can make it home. Maybe a limp home mode that gives you a couple miles left before total shutdown. Certainly wouldn't want a lipo pack fire under my butt :)
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Unread 07-30-2014, 08:52 AM   #62
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Default Re: LiFePo4 batteries

I would recommend checking cell voltages fairly often at first to see how quickly they get out of balance. I have to balance the LiPo batteries I use for my model airplanes fairly frequently. I have a balancer that does that for me. My packs are only three cells and they really need balancing because electric airplanes are hard on batteries.
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Unread 07-30-2014, 09:09 AM   #63
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Default Re: LiFePo4 batteries

did you guys hear about the new technology that was stumbled upon recently? The holy grail of battery design, stable lithium anode!!

http://www.droid-life.com/2014/07/29...ease-capacity/
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Unread 07-30-2014, 09:23 AM   #64
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Default Re: LiFePo4 batteries

I have a digital voltmeter installed to warn be long before the batteries approach low voltage. I also programmed my alltrax to cut off just before the absolute minimum voltage to also aid in preventing over discharge.

I am not too worried about encountering an inbalance anytime soon. The bottom balance method I used is widely accepted in the EV Conversion groups as a very good method of maintaining battery balance.

You cannot balance both the top and the bottom voltage range on the same batteries, a choice has to be made on which end is more important to monitor for the user. I choose bottom balance for safety. I do not need maximum range or run time (like remote controls would), if I did need maximum range I would have top balanced with a BMS.
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Unread 07-30-2014, 02:35 PM   #65
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Default Re: LiFePo4 batteries

Quote:
Originally Posted by scooterman View Post
did you guys hear about the new technology that was stumbled upon recently? The holy grail of battery design, stable lithium anode!!

http://www.droid-life.com/2014/07/29...ease-capacity/
Seen that article as well. Will be great if they perfect that method and it's not hyper expensive
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Unread 07-30-2014, 02:37 PM   #66
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Default Re: LiFePo4 batteries

Quote:
Originally Posted by Volt_Ampere View Post
I would recommend checking cell voltages fairly often at first to see how quickly they get out of balance. I have to balance the LiPo batteries I use for my model airplanes fairly frequently. I have a balancer that does that for me. My packs are only three cells and they really need balancing because electric airplanes are hard on batteries.
I do the balance charge every single time with my RC cars. Would rather not take a chance even with low voltage shut off circuit on board the ESC. Also have a little battery pack voltmeter that connects to each LIPO packs' balance connector to measure the total voltage & individual cell voltage. Worth the $5 for sure.
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Unread 07-30-2014, 02:40 PM   #67
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Default Re: LiFePo4 batteries

Quote:
Originally Posted by sportcoupe View Post
I have a digital voltmeter installed to warn be long before the batteries approach low voltage. I also programmed my alltrax to cut off just before the absolute minimum voltage to also aid in preventing over discharge.

I am not too worried about encountering an inbalance anytime soon. The bottom balance method I used is widely accepted in the EV Conversion groups as a very good method of maintaining battery balance.

You cannot balance both the top and the bottom voltage range on the same batteries, a choice has to be made on which end is more important to monitor for the user. I choose bottom balance for safety. I do not need maximum range or run time (like remote controls would), if I did need maximum range I would have top balanced with a BMS.
Either method, these batteries are so much better than lead acid. Just the weight advantage without the extra power they pack translates to more run time and power. Like dropping 300lbs off the cart.
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Unread 08-08-2014, 07:57 PM   #68
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Default Re: LiFePo4 batteries

20140808_171518.jpg

20140808_174231.jpg

20140808_171501.jpg

20140808_171425.jpg
Put batteries into an EZGO PDS tonight
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Unread 08-08-2014, 09:22 PM   #69
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Default Re: LiFePo4 batteries

What do all the small wires do. Why so many? Not trying to be neg, but looks like the back side of my PC.
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Unread 08-08-2014, 10:03 PM   #70
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Default Re: LiFePo4 batteries

The small white wires go the BMS ( battery management system). It monitors each cell, prevent over charge and over discharge. And yes, it is sloppy, but it is temporary, the wire harness was made for my club car
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