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View Poll Results: would you ride it around town? | |||
yes | 30 | 60.00% | |
no | 10 | 20.00% | |
wat | 10 | 20.00% | |
Voters: 50. You may not vote on this poll |
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05-09-2008, 02:08 PM | #1 | |||
Scooby Guru
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my electric bike
August 24, 2012 update reflecting its v2.0 rebuild with a 9C 2806 hub motor and a 48V 35A regen-enabled Infineon controller:
Quote:
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Last edited by shikataganai; 09-01-2012 at 11:27 AM. |
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05-09-2008, 02:12 PM | #2 |
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You spent $2110 on that?!?!
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05-09-2008, 02:14 PM | #3 |
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moar pics... where is the drive??
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05-09-2008, 02:15 PM | #4 |
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Man that is so cool! The way the motor is packed on the hub, suggests that it must have some pretty high torque. How long does the batteries last before it need to be recharged? How much weight do you think you added to the bike?
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05-09-2008, 02:16 PM | #5 |
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the battery alone was $900, as you no doubt read. decent bikes aren't cheap. decent electric stuff isn't cheap either.
of course, if you don't mind total crap (both on the bike and electric sides) that you'll no doubt leave in your garage once it dies, then walmart has an electric bike for $350. for that you get 1/3 the usable battery capacity, about 1/6 the power, and none of the niceties of a non-dept store bike. http://www.walmart.com/catalog/produ...uct_id=8467096 |
05-09-2008, 02:18 PM | #6 |
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05-09-2008, 02:18 PM | #7 |
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Is it AWD?
Will it do a burnout? |
05-09-2008, 02:19 PM | #8 |
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lucky..
you take it off any sweet jumps? |
05-09-2008, 02:25 PM | #9 | |
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that's all i have at the moment. real camera is up north with the girl, and cell phone camera doesn't take good pics up close (doesn't really take good pics from afar, either ). the motor is within the front wheel's hub.
Quote:
i use about 15-20 Watt-hours (Wh) per mile the way i ride, which includes pedaling, of course! the battery is a 48V 12Ah lithium. Wh = V * Ah, so the battery theoretically has 576 Wh. in reality i'll probably get 500 Wh out of it, so 20-25 miles is the range before recharging. added weight is a lot, on the order of 35 extra lbs. you don't want to do this to a bike you like for being a bike, if that makes sense. here's the power and torque curves for the motor in question (Crystalyte 407) hooked up to a 48V battery with a 35A controller: that i'm seeing peaks higher than the graph indicates that i'm going over 35A, i think. how to interpret the graph: to push a typical rider and bike along at 25 mph on flat ground takes 500W more or less, with aerodynamics (tucking), tire choice and pressure, and other factors making this a very ballpark figure. notice that this motor is just above 500W at that speed. this is why top speed on flat in a tuck is right around there. Last edited by shikataganai; 05-10-2008 at 10:55 AM. |
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05-09-2008, 02:31 PM | #10 | |
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Quote:
- no license requirements or registration fees - less riding gear - can park legally anywhere a bike can - can stash the bike on the bus bike racks to take advantage of seattle's good public transit system - no gas bill! (high up front cost, but cost per mile is miniscule if you don't count battery costs: $0.001/mile so far by my calculations) and, very important to me personally: - not spewing out emissions. motorcycles and mopeds, especially 2-stroke ones, are horrible in this regard. sure, they might have low CO2, but all the smog-forming (and asthma causing) pollutants are an order of magnitude higher than a car, let alone an electric vehicle. i'm in the NW, remember, so my power is largely hydroelectric. it is technically AWD. my legs power the back, electricity up front. |
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05-09-2008, 02:31 PM | #11 | |
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Portland Tricross XRs |
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05-09-2008, 02:36 PM | #12 |
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you're missing the point. i already have a nice road bike that i have been commuting on for the last 7 years (see below). this electric bike is a whole different ballgame, a vehicle in between a bike and anything powered by gas.
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05-09-2008, 02:44 PM | #13 |
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so how does that battery recharge? please excuse my noob question.
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05-09-2008, 02:49 PM | #14 | |
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Quote:
the battery is a big brick inside the rack trunk, btw, not the black thing on the downtube. that's the motor controller on the downtube. if you look closely in front of the rack trunk you can see the red Anderson Powerpole connector of the battery sticking out into the air... |
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05-09-2008, 02:52 PM | #15 |
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So, what happens when you roll over something slick (manhole, paint, greasy puddle) while trying to put 1300W of power to the ground with a wrong-wheel-drive bicycle?
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05-09-2008, 02:56 PM | #16 |
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05-09-2008, 02:58 PM | #17 |
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the tire slips, duh. bicyclists and motorcyclists have to be wary of the road surface just as part of riding. it's not a big deal, especially since i'm typically only drawing 100-400W of power.
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05-09-2008, 03:00 PM | #18 |
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05-09-2008, 03:04 PM | #19 |
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hahahaha
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05-09-2008, 03:15 PM | #20 |
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That is a really neat project, it's very obvious that you really got the details down. Good work, awesome tinkering. Have you considered submitting details to something like MAKE magazine?
As for the naysayers, $2K isn't really all that money in bike-land, and this one provides a hell of a lot of functionality for daily use. Not to mention the electric motor and battery likely require minimal amounts of maintenance and upkeep compared to an internal combustion engine. |
05-09-2008, 03:29 PM | #21 | |
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Quote:
there are actually a lot of similar rides by users on endless-sphere.com/forums . mine is one of the cleaner ones since i actually have decent taste in bikes to begin with, and because i started out with LiFePO4 instead of mucking around with SLA junk. |
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05-09-2008, 04:35 PM | #22 |
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That's pretty cool! I wouldn't personally spend that kind of money on something like that, but I'm not in to bikes (I'd rather ride a Ruckus). Good work!
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05-10-2008, 11:00 AM | #23 | |
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Quote:
at those speeds my non-geared hub motor (some have internal gearing and behave differently) is about 40% efficient. thus i was getting maybe 600W to the ground, and was dissipating 800W as heat. i'll still gladly take 600W up hills, though, not to mention the peak of ~850W to the ground around 17 mph. it's a kick. ok, time to ride it some more: heading off across town to the hardware store to get metal. going to try to fabricate a holder for the battery that'll mount along the downtube, to get the 18 lbs of lithium more central and much lower than on the rear rack... |
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05-10-2008, 11:08 AM | #24 |
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cool fabrication...congrats to you...good luck with it
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05-10-2008, 11:14 AM | #25 |
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thats awesome keep it up. im far to fat for such action 6'5 320
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