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  1. S

    electric electric bike with 30-40 mph AND range??

    ^^ yea I'm a pretty experienced cyclist. I honestly don't think having a rigid frame, or even rigid fork will be super bothersome for me personally. I'm not at all stranger to 30+ on a road bike unassisted and 40+ on descents. not bragging, just different strokes different folks. I'll sacrifice...
  2. S

    electric electric bike with 30-40 mph AND range??

    I dabbled with idea of electric motorcycles for a little bit and decided that bicycles would be WAAAYYY easier and more practical. Why waste 3x the amount of energy going 60 mph when you can get 3x the amount of range going 30 mph, and not have to worry about a bunch of safety gear? So I have in...
  3. S

    battery recommendations for a motorcycle?

    maybe i just suck at googling, but it looks a lot of the leaf modules are out of stock in the online retailers. how do you buy used car batteries, especially if you want to make sure they're good? also, they did a study comparing the newer nissan leaf batteries with the first gen batteries. the...
  4. S

    regen braking and engine braking?

    5% for regen seems pretty shitty. what does your distribution look like for highway/street miles? i think i read somewhere that you want to limit the regen to something like 15-20%, so the motor doesn't overheat. otoh, i can totally see how having a bike that coasts can be a pretty neat thing...
  5. S

    Earthdas Graphene Battery Charges in Five Minutes

    the nature paper cited by the samsung study with the use of graphene is very impressive (link: https://www.nature.com/articles/s41467-017-01823-7). but the main problems that graphene is good at solving is 1. electrical conductivity and 2. mechanical integrity. in the case of the NCM material...
  6. S

    regen braking and engine braking?

    one thing about my gas motorcycle is that i can use my throttle to slow down around corners. I don't think you can really do this on an electric motorcycle, unless you have regen braking. So for those with electric bikes, is going around corners harder, because you have to pay a lot more...
  7. S

    battery recommendations for a motorcycle?

    are you referring to these? http://edisonmotors.net/shop/product/panasonic-25ah-nmc-3-7v-battery-cell-25ah-218?category=7 their $/Wh is almost twice that of the nissan leaf modules though ($0.43/Wh vs $0.24/Wh) leaf modules...
  8. S

    First post, electric motorcycle build.

    in an ideal world, yes, you would expect that 2 things having the same input would have the same output. but the engineer and builder in me thinks otherwise. there's a documentary on when they started racing electric bikes at the isle of man tt (i think it's called "Charge"). the first prototype...
  9. S

    First post, electric motorcycle build.

    what if the two motors out put aren't exactly the same? wouldn't the motor doing less work slow down the motor doing more work? what's the reasoning to have 2 motors instead of one?
  10. S

    Thread for new battery breakthrough PR releases

    you'd be dissappointed with the sport mode hehe
  11. S

    Thread for new battery breakthrough PR releases

    Gotta keep the shareholders and investors happy you know. I was at a few battery talks during a conference at my university earlier this year and there were multiple professors who were talking about solid state technology, at least one was being funded by Toyota. But when faced with the...
  12. S

    battery recommendations for a motorcycle?

    cool thanks for the tips. how do you keep the batteries cool during charging and/or under the sun? I figure keep it under a cover when it's in the driveway (no garage :'(). Is a fan really necessary? i think for the setup that i'm imagining, with a ~9 kWh system (I think/hope my bike can fit...
  13. S

    battery recommendations for a motorcycle?

    for a few days now, i've been thinking about an electric motorcycle. nissan leaf modules seem to be a popular choice, but by now, they're considered old tech. the better batteries now use NCM and NCA chemistry, but my understanding is that they also tend to be a little expensive. my interest...
  14. S

    Thread for new battery breakthrough PR releases

    solid state batteries have a long ways to go. there is something inherently limiting about lithium ions diffusing through a solid material, compared to a liquid electrolyte. if it does get developed, it won't be used for high power density applications like EV's. It will likely get used for...
  15. S

    Battery Life DOD SOC Temperature Charge Rate Study

    sorry i'm late to the party. i only recently started to seriously contemplating a motorcycle build. I study batteries, and perhaps i can shed some light on this matter.. the vast majority of capacity loss is due to parasitic side reactions of the electrolyte. the byproducts form a layer on the...
  16. S

    fast e bike (2000+ W) with long range (100+ miles)?

    this likely won't be a bike where I'll do much pedaling. at 30-40 mph, I'll be spinning 90-110 rpm on a 53/11 gear ratio, which isn't bad, but if I wanted a workout, I'd just ride my regular bike. also, at a higher rpm, it's harder to put power down, and I imagine I won't be putting in more than...
  17. S

    fast e bike (2000+ W) with long range (100+ miles)?

    thanks for the replies. I do already have a motorcycle. it's not running right now though, and I just don't want to deal with ICE's. Maybe I'll just spend the time to get that thing fixed and call it good.. the thing about going 20 mph is that I'm a competitive cyclist too. I can go 20 mph for...
  18. S

    fast e bike (2000+ W) with long range (100+ miles)?

    I originally wanted to build an electric motorcycle for commutes, errand runs, or just joy rides around the beautiful hill country around here. However, motorcycles are heavy, and consume around 116 Wh/mile on average, which is like a best case scenario of a zero motorcycle. On the other hand...
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