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  1. M

    My first DIY electric motorcycle

    Well i promised infrequent updates and I'm here to deliver on that promise. Some progress has been made since I last shared anything. Biggest DIY thing is the battery is almost complete. Everything but the connector is ready to go as i simply haven't ordered them yet and I'm not in a rush...
  2. M

    My first DIY electric motorcycle

    Thanks for the Input. My background is in avionics so I know a lot about handling wire that's 16awg or smaller, but a little less when it comes to pushing actual power delivering current. I'm looking at the Anderson SB175 as my battery is rated for 2C continuous (130A@13.5Kw) so I want to be...
  3. M

    My first DIY electric motorcycle

    84 days It took 84 days for the second batch of batteries to come in the mail. I'm happy I got them when I did too, as the price has gone up by about 20% since I got mine. Gas has also gone up a bunch lately too so my rush on this project also just went up a notch. its now 2.07 per liter in...
  4. M

    1974 Vespa 125 Primavera conversion, 5kw hub motor

    I don't have anything against overbuilding, its a very good way to keep things safe. But 250A is still far more power than you need. So if space allows, then by all means go 250, but your 5kw motor even peaking to 10kw, will only draw a max of 135 amps. Do with this information what you...
  5. M

    Replicating lead acid battery with DIY Lithium Pack

    The battery you linked are LiFeP04 pouch cells in a 4s configuration. I had one from that company quite some time ago and it ended up swelling to the point where the case broke (my fault, not the batteries) so I was able to see inside and the guts are nicely built, even if they are expensive...
  6. M

    QSmotor 8kw, how big battery needed?

    I've got a 6.7KWh battery (28s20p pack) that I'm planning on pairing with an 8KW hub in my CBR125 conversion. From the information I've gathered I'm expecting to get around 100km (60 miles) of range out of it at about 80kph. It's not a long range commuter bike so I'm fine with that. It may...
  7. M

    Starting 2009 Honda CRF450 Build

    The KW will be a mostly fixed constant for any given battery with the same cells. In this case - 3.2v multiplied by its max current of 18A (3C) gives 57.6 watts per cell. Multiply that by 48 cells in that theoretical pack to get 2.76Kw continuous. Repeat the same calculations but use the 10...
  8. M

    Starting 2009 Honda CRF450 Build

    I may not be super experienced in motors yet, but I do know a thing or two about batteries. With your needs of having range at a reasonably low speed, then the numbers stated above are pretty accurate, but obviously, more range is always better...
  9. M

    My first DIY electric motorcycle

    Sounds very possible. The batteries were only ordered 10 days apart so I expected them to show up 10 days later. With some room for error of course. Thankfully the seller did respond to my message and was able to give me some updated tracking info showing that it is at least reached Canada...
  10. M

    My first DIY electric motorcycle

    Received my charger just the other day, but unfortunately I am still waiting for the remainder of my battery cells. AliExpress has 7 more days until I open up an order dispute to get a refund. Strange thing is that I received my other 140 cells from the exact same seller about a month ago and...
  11. M

    My first DIY electric motorcycle

    That is a very interesting concept, I and also agree that it sounds like something i should not do. Probably fine if it's applied in something more industrial like and not at what I'll call "hobby grade" level that many of us build at. For now though I'm out of cells and need to wait on my...
  12. M

    My first DIY electric motorcycle

    The initial plan was/is to include the BMS within in the battery pack to keep everything as one clean unit with only a charge and discharge plug coming off it. Lately I've been tossing around the idea of skipping the BMS in the discharge circut and having it wired as a charge only BMS. Heat...
  13. M

    My first DIY electric motorcycle

    I dont trust anything I buy, china overstock or otherwise, which is why I bought the testers in the first place. So I like to test most of the things I buy. As for bottom balancing, I'm afraid I'm going to have a hard time once this pack is all assembled and covered in heat shrink. So ill have...
  14. M

    My first DIY electric motorcycle

    Good news, bad news. Good news: I no longer have to test all 560 of my cells which would have taken over a month of non stop charging and testing. Bad news: My testers are so inconsistent that the same battery tested on the same tester, but in a different slot, returned two VERY different...
  15. M

    My first DIY electric motorcycle

    Yup, I'm accounting for all that. Before I even got my first bike I got back into electric RC planes and cars so did a lot of reading on how to treat lithium cells as a lot of my battery knowledge was a little dated with NiCd and NiMh cells. The cells will be charged on my programmable hobby...
  16. M

    My first DIY electric motorcycle

    since the link is 10 lines long I won't share it, but just search "AMZCNC hydraulic crimper" and it will show right up. It's literally an amazon basics tool, but it's fine for my uses. On to other news. I got BATTERIES!!!! My first batch of 140 Panasonic NCR18650B cells arrived in the mail...
  17. M

    My first DIY electric motorcycle

    Got my new wire crimper in the mail the other day, and what better time to give it a test than in a power outage. Fabricated myself a new set of 6awg welding cable leads to connect my 1500w inverter to a classic car battery. Enough for when the power goes out and you need to run a few things...
  18. M

    My first DIY electric motorcycle

    As should be rather obvious from my previous picture, the bike is still completely assembled and in a functional state. As I still have a month or two before my batteries come in from the shipper then I have at least until then to make a decision if I want to order an extra row or two of cells...
  19. M

    My first DIY electric motorcycle

    There's space for sure, but it's not all usable. There are a lot of horizontal braces in the frame that make lining everything up somewhat impractical. I'm already going to have to remove some of the old engine mounting brackets to fit the currently planned battery in place making this a...
  20. M

    My first DIY electric motorcycle

    Thanks, but so far from my experience I would not recommend this bike. The frame shape really doesn't lend itself to electrification very well. The primary reason is that it narrows up to come to a point to join up with the forks surprisingly far back on the frame. This doesn't allow for a...
  21. M

    My first DIY electric motorcycle

    I've officially ordered the rest of the cells. I now have 580 cells to test and I'll ditch the 20 lowest capacity ones as spares for another project bringing me to a 28s 20p pack. I''ll let you all know how it goes once I'm done testing them in five years. Basically I'm a little broke at...
  22. M

    My first DIY electric motorcycle

    Thanks for the input. I may have to have a look into that. I have done some quick napkin math and found that it's going to take a great many days to check all these cells. It comes out to 70 batches of cell tests. However I don't have a lot of time to weld up cells each night so I'm really...
  23. M

    My first DIY electric motorcycle

    Update! I know, so much rapid progress in a short period. How do I do it? Anyway, I finally, finally, finally, settled on a battery design. I feel like I've said that before, at least three or four times now. But this time I've bought some cells, so I'm fixed as for what I'm going with so I...
  24. M

    Can I run 2 x 48v bms in series to make 96v?

    OK, Here's the current plan, with a wiring diagram too. Now that i've learned some more here and also done some outside reading I think going full DIY with the battery hookup 32650 cells is my best bet, even though it will be the most work by far. The plan for the battery is to make two...
  25. M

    Can I run 2 x 48v bms in series to make 96v?

    Huh, the more you know I guess. Perhaps I could make the BMS completely separate from the battery and treat it more like hobby LiPo batteries with both a power connector and another balance connector. I'd only be able to charge on the bike, but then I could easily remove the bms from the...
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