Author Topic: Cheap Electric fatbike  (Read 24748 times)

starman

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Re: Cheap Electric fatbike
« Reply #15 on: January 28, 2016, 02:53:12 PM »
Lunacycle has some very nice battery packs. Looks like the battery prices have come down considerably using the 18650 cells. $475.00 for a 13.5ah 52v Panasonic battery pack at 7lb 11oz is pretty damn good. Once bolted down it would be an effort to steal. If the bike is targeted I would expect them to steal the bike and not try to part it out on the beach.

I personally WOULD NOT try to build my own battery pack considering the dangers when charging large format Lithium batteries if things are not built by someone with expert knowledge.

Nice review here;

http://electric-fatbike.com/2016/01/19/pink-bunny-arrested-charged-with-battery-new-18650-cells-vs-alkalines-ncrb-shark-packs/


PonoBill

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Re: Cheap Electric fatbike
« Reply #16 on: January 28, 2016, 04:21:35 PM »
I personally WOULD NOT try to build my own battery pack considering the dangers when charging large format Lithium batteries if things are not built by someone with expert knowledge.

Absolutely correct. I've been fiddling with big LiPo packs for years to power multicopters and other stuff, and they still scare the crap out of me. Good way to burn down your garage. LiFe is much safer.
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dabigkahuna

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Re: Cheap Electric fatbike
« Reply #17 on: February 01, 2016, 05:40:56 AM »
Got a question for people who use their eBike to go to the beach:  what do you about securing your bike?  I know a lot of beaches are notorious for theft.  Is a bike like enough?  Do you "grunge" the paint job so it doesn't stand out too much?

Bean

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Re: Cheap Electric fatbike
« Reply #18 on: February 02, 2016, 12:21:23 PM »
That's got to depend upon the vibe at your beach.  The kids that come to our beach have no idea what a bike lock is, they leave their bikes (some expensive some not) in a heap (and we're talking Jersey here (no, not the Isle of Jersey)).

PonoBill

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Re: Cheap Electric fatbike
« Reply #19 on: February 02, 2016, 06:26:56 PM »
My bikes generally look so weird that no one messes with them.
Ponohouse is for sale: http://www.ponohouse.com
Foote 10'4X34", SIC 17.5 V1 hollow and an EPS one in Hood River. Foote 9'0" x 31", L41 8'8", 18' Speedboard, etc. etc.

dabigkahuna

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Re: Cheap Electric fatbike
« Reply #20 on: February 03, 2016, 03:15:43 AM »
My bikes generally look so weird that no one messes with them.

Your last build looks pretty trick, I would think it would be the first bike to get nabbed.  Maybe Maui is better than Oahu?  Got a buddy who uses rattle can paint to grunge up his $10K carbon bike.  Helps, but they still get stolen. 

stoneaxe

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Re: Cheap Electric fatbike
« Reply #21 on: February 03, 2016, 08:06:11 AM »
Got a question for people who use their eBike to go to the beach:  what do you about securing your bike?  I know a lot of beaches are notorious for theft.  Is a bike like enough?  Do you "grunge" the paint job so it doesn't stand out too much?

OK....here's a task for Bill. Ant-theft device...Wire the batteries to a capacitor...circuit is closed when you grab the handlebar and sit on the seat...... :o
Bob

8-4 Vec, 9-0 SouthCounty, 9-8 Starboard, 10-4 Foote Triton, 10-6 C4, 12-6 Starboard, 14-0 Vec (babysitting the 18-0 Speedboard) Ke Nalu Molokai, Ke Nalu Maliko, Ke Nalu Wiki Ke Nalu Konihi

PonoBill

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Re: Cheap Electric fatbike
« Reply #22 on: February 03, 2016, 09:06:36 AM »
Easily done, but you've forgotten my bad memory. The first person to get 50 thousand volts to the nuts would be me.
Ponohouse is for sale: http://www.ponohouse.com
Foote 10'4X34", SIC 17.5 V1 hollow and an EPS one in Hood River. Foote 9'0" x 31", L41 8'8", 18' Speedboard, etc. etc.

kayadogg

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Re: Cheap Electric fatbike
« Reply #23 on: February 03, 2016, 09:48:12 AM »
Enjoy  ;D


PonoBill

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Re: Cheap Electric fatbike
« Reply #24 on: February 03, 2016, 11:08:26 AM »
I'm building a DIY 44V 20AH LiPo battery with a hacked BMS. Anyone stealing the bike may be subject to sudden explosions or fires. We'd probably find the thief by following the fire trucks to the shell of his former garage.

Turnigy just came out with a Graphene shielded LiPo. Unbelievable specs. A bit expensive (though cheaper than standard 5A 16V LiPos were a year or two ago), but you could weld 1/4" aluminum plate with one of these batteries. 6 amps, 130C burst which means you can discharge at 780 amps in bursts, 390 amps continuous at 16Volts. That's 12.5 KW from ONE battery. Insane.


TURNIGY, the name synonymous with performance, reliability and innovation is excited to release a powerful new battery chemistry in the Turnigy Graphene! 
What does this really mean for you? Well not only do Graphene batteries go harder for longer but they're unlike anything you have seen or used before. 
Turnigy Graphene packs utilize carbon in the battery structure to form a single layer of graphene just 0.335nm thick, making that type of battery substrate the thinnest known to mankind. The graphene particles form a highly dense compound allowing electrons to flow with less resistance compared to traditional Lipoly battery technologies.
The result is a battery capable of maintaining greater power output whilst remaining much cooler under load.  Since heat and resistance are the natural enemy of batteries Graphene chemistry has significantly reduced these problems and the result is an incredible boost in cycle life.
Turnigy Graphene batteries are the new standard for serious hobbyists who require POWER ON DEMAND.
Specs:
Capacity: 6000mAh
Voltage: 4S1P / 4 Cell / 14.8V
Discharge: 65C Constant / 130C Burst
Weight: 742g (including wire, plug & case)
Dimensions: 168x69x34mm
Balance Plug: JST-XH
Discharge Plug: XT-90
Advantages over traditional Lipo batteries.
Power density: 0.15-0.17kw/kg (5Ah-16Ah)
Power density: 0.13-0.15kw/kg (1Ah-4.9Ah).
Stable High pack voltage through duration of use.
High discharge rate, giving more power under load.
Internal impedance can reach as low as 1.2mO compared to that of 3mO of a standard Lipoly.
Greater thermal control, packs stay much cooler under extreme conditions
Higher capacity during heavy discharge.
Maintains higher pack capacity even after hundreds of cycles
Fast charge capable, up to 15C on some batteries.
Longer Cycle Life 600+

I imagine Musk and the gigafactory are all over this.
« Last Edit: February 03, 2016, 11:24:59 AM by PonoBill »
Ponohouse is for sale: http://www.ponohouse.com
Foote 10'4X34", SIC 17.5 V1 hollow and an EPS one in Hood River. Foote 9'0" x 31", L41 8'8", 18' Speedboard, etc. etc.

Old School 213

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Re: Cheap Electric fatbike
« Reply #25 on: February 03, 2016, 11:18:48 AM »
Enjoyed the vid. They got off light, there was not enough DNA left on the fence/tree/car/sidewalk.

stoneaxe

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Re: Cheap Electric fatbike
« Reply #26 on: February 03, 2016, 04:55:57 PM »
That was awesome.
Bob

8-4 Vec, 9-0 SouthCounty, 9-8 Starboard, 10-4 Foote Triton, 10-6 C4, 12-6 Starboard, 14-0 Vec (babysitting the 18-0 Speedboard) Ke Nalu Molokai, Ke Nalu Maliko, Ke Nalu Wiki Ke Nalu Konihi

stoneaxe

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Re: Cheap Electric fatbike
« Reply #27 on: February 03, 2016, 04:57:11 PM »
Easily done, but you've forgotten my bad memory. The first person to get 50 thousand volts to the nuts would be me.

So long as there is video..... :)
Bob

8-4 Vec, 9-0 SouthCounty, 9-8 Starboard, 10-4 Foote Triton, 10-6 C4, 12-6 Starboard, 14-0 Vec (babysitting the 18-0 Speedboard) Ke Nalu Molokai, Ke Nalu Maliko, Ke Nalu Wiki Ke Nalu Konihi

p06781

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Re: Cheap Electric fatbike
« Reply #28 on: February 19, 2016, 12:23:30 AM »
Hey what do you think of the new sonder thin ebike ?  499 + 193 shipping?  Is it worth it ? 

https://www.indiegogo.com/projects/sondors-thin-electric-bike/x/9019669#/

Jim

PonoBill

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Re: Cheap Electric fatbike
« Reply #29 on: February 19, 2016, 01:27:47 AM »
It's pretty low spec, but it's certainly cheap. I don't know why they call it a single cell battery, it's not, it's likely a 12S2P LiFe battery. 36v 8.6 amp (300watt-hours) is on the small side and a 350W hub motor is pretty weenie, especially for a single speed bike. I wouldn't want one, but they're selling a lot of them.

For comparison, my fatbike is 750W crank drive with seven speeds and a 800 watt hour battery.

So what's with the wind machine hair pose in the beginning of the video. Sheesh.
Ponohouse is for sale: http://www.ponohouse.com
Foote 10'4X34", SIC 17.5 V1 hollow and an EPS one in Hood River. Foote 9'0" x 31", L41 8'8", 18' Speedboard, etc. etc.

 


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