Nissan Leaf Balancing
I decided to do a Nissan Leaf conversion. I am contemplating the BMS top balance vs the bottom balance and wondering if there is a third option. What about top balancing the cells by individually charging them? I have a hobby charger for lithium batterys which has 3 options: LiIo 3.6v, LiPo 3.7v, and LiFe 3.3v. I am wondering if I could use one of those settings to charge each cell to full charge and get the same results as a bottom balance?
Secondly, I have read as many Leaf conversion threads as I can find. Truly a wealth of information. Thank you to all who took the time to document the process. Now that a bit of time has elapsed since those builds, would you do anything differently if starting over? |
Re: Nissan Leaf Balancing
Any balancing is only temporary. You need a BMS that keeps your cells in balance and protects EVERY cell from over / under charge. This is the key to long Lithium battery life.
|
Re: Nissan Leaf Balancing
Unfortunately, your hobby charger would have to be able to charge the Leaf cells to about 4.1 Volts. Nominal voltage for the cells is 3.8V. Also remember that each of the 2P sections is 60-66aH. Your charger would need to be capable of charging at a fairly high amperage to fill em up.
I used a mini-bms on my 84V pack and am doing the same on my 72V pack. These will eventually top balance my packs. On the other hand Sportscoupe and others just bottom balance the packs with no bms. I'm sure both methods will work, but I like the added security of neither overcharging nor over discharging my pack. |
Re: Nissan Leaf Balancing
No BMS won't work for very long. (Unless you manually balance frequently)
|
Re: Nissan Leaf Balancing
Quote:
Roncat, you mentioned in a previous post that you had some problems with the BMS install on the ezgo. No hesitation in getting another as opposed to bottom balance? |
Re: Nissan Leaf Balancing
Quote:
Just make sure to not short the cell modules to pack voltage and you will be fine. Take it from me… a little electrical tape on the unhooked connections is worth its weight in gold:thumbup: |
Re: Nissan Leaf Balancing
http://www.diyelectriccar.com/forums...bms-53768.html
http://www.diyelectriccar.com/forums...ing-85458.html There are plenty more if you want to drive yourself crazy reading. It's just a golf cart.... |
Re: Nissan Leaf Balancing
SC,
Thanks for the links. Lots of good information above my pay grade. Did you get the ah meter from Lightobjects? If so, how do you like it? You posted a diagram of individual cell monitoring device. Did you make these or purchase them? |
Re: Nissan Leaf Balancing
Quote:
I didn't use Lightobjects Ah meter. I also didn't post an individual cell monitoring device, I posted a cell balance warning device. It's not available as a "kit", you have to make it yourself. It consists of a few LED's and a couple resisters. The purpose is to instantly let you know if a cell goes high of low. It is highly accurate depending on the resister value used. It does not tell you which cell went high of low though. That didn't worry me, I liked the fact it was always monitoring the pack and was under $10. Link here: http://www.evdl.org/pages/battbridge.html |
Re: Nissan Leaf Balancing
Quote:
|
All times are GMT -5. The time now is 02:14 PM. |
Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
This Website and forum is the property of Buggiesgonewild.com. No material may be taken or duplicated in part or full without prior written consent of the owners of buggiesgonewild.com. © 2006-2017 Buggiesgonewild.com. All rights reserved.