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Thread: Electric Race Kart build

              
   
   
  1. #31
    Senior Member Nicman's Avatar
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    Battery Chemistry Nominal Voltage Series Parallel Cells Needed Pack Voltage Amp Hour Highway Miles (est) City Miles (est) Weight per Cell Cost Per Cell Pack Weight Cost per module KWh Capacity
    LEAF 8.4 14 2 28 117.6 64 75.264 120.4224 8.8 $80.00 246.4 $2,240.00 15.0528
    Evolion 4.2 28 3 84 117.6 77 135.828 217.3248 4.7 $20.00 394.8 $1,680.00 27.1656
    C Max 4.2 28 6 168 117.6 24 84.672 135.4752 2 $9.00 336 $1,512.00 16.9344
    LiTec 4.2 28 2 56 117.6 53 62.328 99.7248 3.6 $24.00 201.6 $1,524.00 12.4656
    VL41 4.2 28 4 112 117.6 35 82.32 131.712 2.53 $12.50 283.36 $1,500.00 16.464
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    Last edited by Nicman; 24 July 2018 at 1808. Reason: formating

  2. #32
    Empulse R #24 frodus's Avatar
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    Not sure why this was posted....

    Care to elaborate?
    Travis

  3. #33
    Senior Member Nicman's Avatar
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    Quote Originally Posted by frodus View Post
    Not sure why this was posted....

    Care to elaborate?
    The formatting was being a bit difficult. In the original post I said I was looking forward to seeing if the VL41s were doing good work for you then I had a excel spreadsheet but couldn't link the actual file so I had to manually format.


    I must have left off the comment in my frenzied space bar pressing

    Sent from my SM-G955U using Tapatalk

  4. #34
    Empulse R #24 frodus's Avatar
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    I just found a surplus of them and bought em cause the cost was super cheap. Not sure they're widely available still. Really it was just a decent cell at a good price.

    One large draw, and this was the same reason I picked Headway, was that the cells are medium format with screw terminals. This means easily bolted together without welding a pack (I've done that too for a race bike and it was a lot of work). Even if they were a little more expensive, I'd have still bought em, because of the ease of assembly.
    Travis

  5. #35
    Empulse R #24 frodus's Avatar
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    An update on the motor mount:
    Kartmasters has made a new plate that fits the ME1507 motor:
    http://kartmasters.fr/shop/en/mechan...-for-kart.html

    They did this last week and I'm getting one shipped here. This should bolt right up to the chassis.
    Travis

  6. #36
    Empulse R #24 frodus's Avatar
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    Got the new ME1507 motor mount, and it fit perfect. Thanks to Kartmasters for making the new plate for me!

    Got a Manzanita Micro PFC30 Charger off the local Craigslist (I love Portland!) that I plan to use to charge the pack. It'll also work off DC, so I might use the remaining 90 cells to build a pack that can dump charge the kart pack. Ted gave me this idea with his solar trailer thing-a-ma-bob. Could build a pack into a truck box that is "somewhat" mobile.

    Built a 12V pack to test the ZEVA BMS and do some charge/discharge with. I really like this BMS. It's super small, easy to wire and set up, and worked out of the box. No software to set up and the price is very reasonable. I'm considering selling them on my website soon.

    Bought a CC440 discharger back from a person I sold it to a couple years ago, so I can do some charge/discharge.

    Picture time!
    Test pack and BMS:
    20180805_180607.jpg

    20180805_180617.jpg

    ME1507 motor and new Kartmasters motor mount:
    20180810_170031.jpg

    20180810_171236.jpg

    20180810_171249.jpg

    Manzanita Micro charger
    20180810_172456.jpg

    CC400 discharger
    20180810_173205.jpg
    Travis

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  8. #37
    Senior Member Stevo's Avatar
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    How much $ do you think you can sell the BMS for? I would need one for 24 cells. I'll wait until you use this for a while to see how well it holds up to regular use, of coarse.
    I was thinking also of dump charging my new pack with my old Nissan Leaf pack wired to solar panels. That was going to be my next big project whenever I can swing the expense of the panels. I'm thinking a 2K watt system would be good, but I think we are on the verge of a major advancement in solar panels. Right now we are at about a 20-24% efficiency. I just read that there was a major discovery of some new test panels that achieved over 60%. Its exponential technology, so the next wave of solar panels should be in the neighborhood of ~50%. That will be game changing and very noticeable. I'm thinking of waiting for this.
    Current rides: '96 Honda Ohlins VFR, '03 Cannondale C440R, '03 Cannondale Cannibal, '06 Yamaha 450 Wolverine 4x4
    Current builds: eVOR.v3.3
    WORX.VOR.v3.2

  9. #38
    Empulse R #24 frodus's Avatar
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    Not sure, probably not much different pricing than they have on their site, because of shipping and tariffs.

    People have been using them a while. I know a couple people that really like em. So far, it's been balancing cells while I charge. Haven't hooked a disable to it yet.

    For solar, I didn't think there was much above 40%... 60% is pretty insane. I bet it's $$$$.
    Travis

  10. #39
    Senior Member Stevo's Avatar
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    Q about dumpcharging one pack from another...

    If you have a 100v pack drained down to 72 v, how do you calculate the max voltage of your charging pack? And does there need to be a shunt and fuse between the two packs?
    Current rides: '96 Honda Ohlins VFR, '03 Cannondale C440R, '03 Cannondale Cannibal, '06 Yamaha 450 Wolverine 4x4
    Current builds: eVOR.v3.3
    WORX.VOR.v3.2

  11. #40
    Empulse R #24 frodus's Avatar
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    Stevo,
    I'm using the The Manzanita Micro charger t charge. It can be lower or higher than the pack I'm charging. It boosts the voltage and then regulates it. You can't just connect packs together without some sort of power controller in between.
    Travis

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