Power in Flux
Likes Likes:  14
Page 2 of 19 FirstFirst 123412 ... LastLast
Results 11 to 20 of 182

Thread: Nissan Leaf battery testing

              
   
   
  1. #11
    Senior Member DRZ400's Avatar
    Join Date
    Aug 2010
    Location
    New Jersey, USA
    Posts
    687
    Post Thanks / Like
    My 40ah cells sag to about 2.65 volts at 280 amps. Thats about the max I can pull....I think its all the 400 amp (rated) Kelly controller can muster. I want to put a DMV across the controller terminals to see the IR drop at full throttle.
    2003 Ninja 250EX, Agni #95R, 6:1 Gearing, 11 Leaf Modules.
    Alltrax SPM72400, 400 amp Controller, all LED lighting
    2014 CRF450X Supermoto
    http://www.evalbum.com/1955
    http://www.evalbum.com/3337

  2. #12
    Seņor Member podolefsky's Avatar
    Join Date
    Oct 2010
    Location
    Boulder, CO
    Posts
    3,890
    Post Thanks / Like
    I was told by a rep from Elite Power Solutions that the 60Ah cells are "stiffer" for some reason. Also depends on age, SOC, maybe even the particular batch of cells. I was also told that Elite tends to get the better cells from the factory. How true that is, I don't know, but I do know performance of your typical LiFe prismatic (GBS, Calb, etc) varies more than "high grade" cells. For example, when Enerdel gets cells that test below spec, they are sold as "B-grade", so you know what you're getting.
    - Noah Podolefsky -
    The GSX-E

  3. #13
    Seņor Member podolefsky's Avatar
    Join Date
    Oct 2010
    Location
    Boulder, CO
    Posts
    3,890
    Post Thanks / Like
    I ordered 14 Leaf modules. They arrived well packaged.

    I learned something that wasn't evident from descriptions online. Every other module has the terminals reversed, as shown in the picture. It's because of how they are assembled in the Leaf pack. Actually kind of nice, because if you stack them as I have, you can jumper straight across to connect cells in series (instead of having to go diagonally from black to red).

    - Noah Podolefsky -
    The GSX-E

  4. Likes Spoonman liked this post
  5. #14
    EVangelist electriKAT's Avatar
    Join Date
    Aug 2010
    Location
    DC
    Posts
    416
    Post Thanks / Like
    Do they come with those orange plastic covers for the terminals? If not, have you thought about how you're going to package them? Assuming you're installing these in your bike?

    I've been watching the hybridautocenter website for a while now and it just says "no stock".

  6. #15
    Senior Member
    Join Date
    Nov 2013
    Posts
    114
    Post Thanks / Like
    Check ebay, he also sells some of the leaf cells there. I'm hoping more of these flood the market, I've been doing a lot of research on them, and they seem like a great deal. I hope they keep showing up, right now I just don't have the cash to get some.

    Here's a BMS solution that I've been looking at for these cells. It's fully programmable, comes with a metal case for mounting, and has an external display.

    http://www.foundingpower.com/en/Prod...012081492.html

  7. #16
    Seņor Member podolefsky's Avatar
    Join Date
    Oct 2010
    Location
    Boulder, CO
    Posts
    3,890
    Post Thanks / Like
    They did come with the orange plastic covers and busbars, but they're more or less useless since I'm going to completely reconfigure the pack. The orange covers are one big piece that only fits if you leave them in the original Leaf configuration.

    Yup, they're going in my GSX. I haven't completely figured it out, but they will basically be bolted through in two stacks, with plates on the ends that mount to the frame. They won't be in a case, since the pouch cells are pretty well protected inside the metal enclosures. I'll come up with some kind of plastic covers for the terminals - also something I haven't figured out yet. I went as far as determining they would fit in my frame, then ordered them while there was still stock. Mine shipped while the website was saying no stock.
    - Noah Podolefsky -
    The GSX-E

  8. #17
    Senior Member DRZ400's Avatar
    Join Date
    Aug 2010
    Location
    New Jersey, USA
    Posts
    687
    Post Thanks / Like
    Are you going to use a BMS? I thought I read on ES that this chemistry didn't require it (like the Konion cells). How long until we get a seat of the pants review? The 1-3C numbers are really impressive.....thats where I do the meat of my riding. I called him, won't be able to ship again until mid August.
    Last edited by DRZ400; 21 July 2014 at 1059.
    2003 Ninja 250EX, Agni #95R, 6:1 Gearing, 11 Leaf Modules.
    Alltrax SPM72400, 400 amp Controller, all LED lighting
    2014 CRF450X Supermoto
    http://www.evalbum.com/1955
    http://www.evalbum.com/3337

  9. #18
    Seņor Member podolefsky's Avatar
    Join Date
    Oct 2010
    Location
    Boulder, CO
    Posts
    3,890
    Post Thanks / Like
    I'm absolutely going to use a BMS. There is no lithium cell that does not need a BMS - you can get away without one if you do the monitoring and balancing through other means (but then you are the BMS...that discussion is probably better for another thread).

    It will be a while before I have a seat-of-the-pants review. Quite a bit involved in doing the battery swap, since I'll be changing pretty much everything except the motor. Plus I'm trying to get time to work on the KZE too.
    - Noah Podolefsky -
    The GSX-E

  10. #19
    Senior Member DRZ400's Avatar
    Join Date
    Aug 2010
    Location
    New Jersey, USA
    Posts
    687
    Post Thanks / Like
    There's a guy on ES...Dr Bass that used the Sony Konion LiMn cells and claimed once initally balanced there was no need other then a HVC for charging and LVC for running....no cell level requirement. He attributed it to the chemistry. He is VERY well respected over there and many others did the same and were sucessful too. He also did allot of work with A123 cells....with BMS (so he wasn't anti BMS like Rikard). I agree with LIFEPO4 you either use a BMS or you ARE the BMS....I saw first hand how fast a cell can go from 3.5 to 4 volts.

    http://endless-sphere.com/forums/vie...p?f=14&t=27707
    Last edited by DRZ400; 21 July 2014 at 1249. Reason: link
    2003 Ninja 250EX, Agni #95R, 6:1 Gearing, 11 Leaf Modules.
    Alltrax SPM72400, 400 amp Controller, all LED lighting
    2014 CRF450X Supermoto
    http://www.evalbum.com/1955
    http://www.evalbum.com/3337

  11. #20
    Seņor Member podolefsky's Avatar
    Join Date
    Oct 2010
    Location
    Boulder, CO
    Posts
    3,890
    Post Thanks / Like
    LIke I said, really better for another thread - I don't want the BMS debate creeping in here.

    I respect Dr Bass a lot, and I agree that you can probably get away with just pack level with the Leaf cells. For a variety of reasons - a big one being the quality control. If the cells are within tight tolerances from the factory, then you don't have to worry about voltage deltas as much.

    I haven't looked at the top end carefully, but I can tell you that they definitely have a cliff at the bottom. Slow, steady voltage drop to 3.6V, then they drop very quickly. So in that respect they are very much like LiFe.
    - Noah Podolefsky -
    The GSX-E

Page 2 of 19 FirstFirst 123412 ... LastLast

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •