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    Converting Polaris Ranger - Question on controller & Voltage

    Not necessarily. Watts are watts. A 58.8v charger (14s times 4.2v per cell) that delivers 10 amps is a 588w charger. A 117.6v charger (28s times 4.2v per cell) that delivers half the amperage of 5 amps, is still a 588w charger. It would take the same amount of time to charge the same...
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    1989 Kawasaki EX500 (Ninja) - EV conversion, finished but still refining

    "This one weird trick that the electric motorcycle industry hates!" . . . . . . . It's tons of free time spent towards labor. That's it, that's the trick.
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    1989 Kawasaki EX500 (Ninja) - EV conversion, finished but still refining

    I was thinking about this. My last bike had an efficiency of 120-140wh/mile. If I were to assume 85 mile range (the low end of my estimation), and my battery has a capacity of 9300wh, that would give the new motorcycle an efficiency of about 110 wh/mile. More efficient. Even though the weight is...
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    1989 Kawasaki EX500 (Ninja) - EV conversion, finished but still refining

    Impressions so far: it's awesome! Mechanically, the bike is so much better than my last frame that I converted. Better suspension, better handling, better braking, more comfortable seat, more comfortable riding position. Fewer wires and cables and other random things that clank around every...
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    Amberwolf disappearance and newbie help requests :(

    I have very little experience with ebikes, I've spent about a cumulative total of 10 minutes actually riding them in my life. What I do know is batteries, the practice of using a motor controller, and how circuits work, both practical experience and the principles of it in general. I like the...
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    KZ440 road legal cafe racer

    Let us know how the used one works. Because that that price point, for that size, I might want to grab a couple of those for future projects.
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    1989 Kawasaki EX500 (Ninja) - EV conversion, finished but still refining

    Specifically, PA6-GF10 (or 30) is one of the most common used plastics in tools and cases. You don't get all of the same properties when it's extruded out a .4mm nozzle, but you get a lot of the same strength.
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    Is a lightweight velomobile legally capable of 50mph feasible

    When I was making my first build, having had no experience with 2 wheeled transport prior, I had thought that I would want to get the smallest, lightest thing I could get and take that at 50 mph. After having settled on a 450cc motorcycle and riding it, I realized how nice it was to have...
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    1989 Kawasaki EX500 (Ninja) - EV conversion, finished but still refining

    If you're talking about just the housing and mounting for you batteries, that's it's own issue. I used 3d prints to "help" mount the battery, but the work is really mostly being done by aluminum plate, steel bars, ratchet straps and polycarbonate sheets. And as you point out, if you're having...
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    1989 Kawasaki EX500 (Ninja) - EV conversion, finished but still refining

    Accessories! To make sure that I can always diagnose and fix issues on the road if I need to. Tool roll brackets, velcro attached: A slot on the side for 3ea 18650s, for my emergency 12v supply: And a slot on one side for a cheap multimeter I totally get that it might look messy to most...
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    52 Volt Battery Issue (14S9P)

    You could use a balance charger. You could use a Liitokala or Opus and rig something to run test leads off the charger leads. If they're fully charged, you could use a load tester. I don't have a recommendation for a specific one of those. Whatever you're comfortable with.
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    52 Volt Battery Issue (14S9P)

    Doesn't seem unlikely at all, actually. Seems like even degredation of a well-cared-for, aged pack. If you assume it was well made in the first place, with equally matched cells, then I would expect them to age out at roughly the same time. Anyway, you'd only need 1 particularly poorly aged cell...
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    52 Volt Battery Issue (14S9P)

    I think your battery has just bit the dust totally, that's all. Or at least enough cells throughout the pack have reached end of life. You say you manually balanced, so yeah, they're identical. But if they're all identically depleted, the voltages will still be same or similar to each other...
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    1989 Kawasaki EX500 (Ninja) - EV conversion, finished but still refining

    Almost made a big mistake! Remember that lovely cover for the BMS on top of the battery lid? Well it turns out, it completely restricts air flow! Gee, who would've thought? I was slowly charging and I had turned on the BMS's balance function, for a top balance. Good thing I was monitoring...
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    Robotics Project: Snuggles, The Wolf

    Hi Amberwolf! Be well!
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    1989 Kawasaki EX500 (Ninja) - EV conversion, finished but still refining

    It's not easy to balance with all that weight, that's for sure! Ive gotten it better than it was, but it does still vibrate a bit. I used this method. FYI, this guy is a little bit hilarious
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    1989 Kawasaki EX500 (Ninja) - EV conversion, finished but still refining

    Thank you! Good luck on your build. I just worked on mine for a few hours a month, for over a year. I only got busy doing stuff in the past two weeks or so, trying to put all the components together. It happens eventually.
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    Need advice on a honda c70 passport build

    In general, it looks like you have a lot of your variables under consideration. And in my opinion, your use case and requirements are realistic, which can't always be said about people planning their first build. So you're already off to a good start. If I were you, I'd go with the 18650s, 240...
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    1989 Kawasaki EX500 (Ninja) - EV conversion, finished but still refining

    It can. I could get back to you later when I start testing it out, but yesterday it felt like my 0-100kph was less than 6 seconds for sure. On regular non-boost mode, no tuning, with a 95volt battery. So yeah, I'd go for it. Like you said, it'll be dependent on which controller you're using, and...
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    1989 Kawasaki EX500 (Ninja) - EV conversion, finished but still refining

    Acceleration is great, feels the same as it used to, just gets up to a higher top speed. I can and will tune the settings for better acceleration, but personally, I'm not a thrill seeker. The bike is my commuter, errand runner, daily driver, occasional joy rider, energy efficient off-grid...
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    Street legal Cafe Racer build.

    Laziness, or lack of design skill. At one point, I looked at the fat orange cable coming out of the QS273 hub motor, and I scored some salvage automotive EV cable from a scrapyard that was also bright orange. So that's when I decided my build was going to be orange!
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    Street legal Cafe Racer build.

    I gave up on all that and just leaned into the look of a totally new electric motorbike. Certainly is a lot easier to design for that!
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    1989 Kawasaki EX500 (Ninja) - EV conversion, finished but still refining

    It's alive! Lots of little cosmetic things to play with to make it a bit tidier. I also need to play with the controller settings and see what it's capable of. Plus range tests, need to build my charger, ect... But I did take it out for a couple short jaunts. Got to 70mph on my regular...
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    High Cell-Count LiPo Charging

    I mentioned in my first response, that if you have a well-balanced pack, that's healthy and taken care of, you won't need to balance it. If you have a pack that's completely out of whack and needs balance charging on every cycle, then you have problems with the cells themselves and are risking...
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    High Cell-Count LiPo Charging

    What's your desired battery pack? I'll assume 16s. 16 x 4.2v/cell = 67.2v. So head over to your preferred online vendor, and search 67.2v charger. Some of them will adjust voltage, some won't. Typically this style of charger can be opened up to find a small blue trim pot on the inside. Using a...
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