New bike - electric!

[cali yaris]

Always tinkering with some new idea. This is a pretty fun ride. 500w 36v 12aH, FWD electric bike. Thanks to John Kuchta for the excellent fabrication work.

https://fbcdn-sphotos-c-a.akamaihd.net/hphotos-ak-prn2/251006_10151648526809824_285140837_n.jpg

[Shroomster]

Lazy! Lol

Does it have regenerative braking :-P


Looks pretty sweet all joking aside.

[Golddeenoh]

Does it have regenerative braking :-P


Given that the motors are directly in the wheel it looks like it should be quite easy to make some sort of diode bridge and redirect the counter electromotive force generated on negative acceleration back to the battery through an AC/DC converter(might be a little redundant since the bridge can do the same thing) and recharge the battery.

[cali yaris]

oes it have regenerative braking :-P

Nope. That would require more electronics. i'm not that far along yet. It's got about a 20 mile range as is, and that's with regular SLA batteries.

[Golddeenoh]

Nope. That would require more electronics. i'm not that far along yet. It's got about a 20 mile range as is, and that's with regular SLA batteries.

um....i already gave a brief explanation of how to do it so yea, now you have to figure out the details :P

[cali yaris]

^ Thanks

[Astroman]

Sweet :thumbup: but where are the brakes? :iono:

[cali yaris]

^ Coaster brake. :smile:

[CTScott]

Time for some super caps (like the 4 lb pack I am running in Crashy2, in place of the OEM battery), instead of the SLA for some serious weight savings, and the easy ability to do regenerative braking.

[xnamerxx]

Nah pickup a bunch LiPOFe4 cells and make a nice battery pack.

I've been tempted to make a battery pack out of a bunch of leftover A123 cells I have. Nothing like 100+ cells sitting around to make you think of the possibilities.

Garm if you cut the power to the electric motor it should work as a pretty decent generator(DC) and a semi functional brake as well.

[cali yaris]

The kit will support up to 60v, which means I'm just getting started at 36v. Might try bumping it up to 48v first.

Range extension will be a future project, right now 20 miles gets me back and forth to work 3 days in a row without charging. Not bad. And pedaling extends the range greatly.

Fun toy!

[Golddeenoh]

what is the generating out put of the electric motor?

[cali yaris]

post #1:

500w 36v 12aH

[Golddeenoh]

i see, that should be enough to daily commute as long as you don't have any steep hills, then it gets all leg power. 12aH seems kind of low for rapid recharging, might have to amplify the out put to get the best benefit out of it.

[kou]

This for getting to work on time even when your a day late.

[tooter]

https://fbcdn-sphotos-c-a.akamaihd.net/hphotos-ak-prn2/251006_10151648526809824_285140837_n.jpg

Hey Garm, :smile:

Cool bike! :thumbsup: That's perfect for semi level Valley transportation. What size are your rims? Large reductions in rolling resistance can be had with light tires which are rated at high air pressure. Bikes are similar to cars in that one ounce of reduced rolling weight is equal to about 9 ounces of static weight. Weight reducing alloy components can also really add up, like handlebars, rims, seats and seat posts.

[cali yaris]

^ 26" wheels with "Thick Brick" tires. This one is fine for my 3 mile commute to work. I have a few small things to do (rear rack, etc.)

My next one will be an ultralight carbon eBike. :smile: