Electric Bike, 40 mile range

[garett0439]

Ok... So would 3 8400mAh 4S2P 30C LiFePo4 Packs be a 39.6v 16.8 ah battery?
If so, if i had 6 of those packs wired for 39.6v would i have 33.6ah?
And if i ran that pack from full to dead would i overheat my motor/speed control, or would it burn up right away from the amps?

(Heres the link to the battery)
http://www.hobbyking.com/hobbyking/store/__14074__ZIPPY_Flightmax_8400mAh_4S2P_30C_LiFePo4_Pack.html

3 (3s,1p) would be 39.6v 8.4Ah
6 (3s,2p) would be the 39.6v 16.8Ah

What exactly does the 2p mean?

 

[parabellum]

What exactly does the 2p mean?

It means there are 2x smaller 4200mAh parallel cells (strings) instead of 1x big 8400mAh cell. It is just parallel strings count. Determining and marked is the total capacity, 8400mAh in this case.

 

[999zip999]

Lifepo4 is the place to start. You controller and motor would not burn up, your lipo would catch on fire. If drain dead as a pactice.

 

[wesnewell]

Ok... So would 3 8400mAh 4S2P 30C LiFePo4 Packs be a 39.6v 16.8 ah battery?
If so, if i had 6 of those packs wired for 39.6v would i have 33.6ah?
And if i ran that pack from full to dead would i overheat my motor/speed control, or would it burn up right away from the amps?

No, if you put 3 in series you get 39.6v 8.4ah
if you parallel in another 3 packs, you would get 39.6v 16.8ah

When you put batteries in series, the ah rating doesn't go up, just the voltage (and watt hours)
When you parallel packs, the ah rating goes up (as does Wh), but voltage doesn't.
Under normal riding conditions, you'll never burn up that 1000W motor with the controller that comes with it. That's because it's limited to 60V and 30A. So that's a max of 1800W you could feed it with a 60V battery. You don't even have a 60V battery, so you can't even pump 1800W into it. Also, once you take off, the amp draw will drop dramatically.

 

[dogman dan]

I think 30 ah of "48v" should be your goal. or 40 ah of "36v". Either one should get you the range, but since you have a hill to get up, I'd be inclined to choose the 48v, which may come off the charger anywhere from 50-60v depending on the exact choice of chemistry and cell count.

One easy way to get there with few hassles woudl be two 48v 15 ah pingbatteries (lifepo4). They could be run one by one, or paralell connected. Carrying 30 pounds of battery is no joke, so you'll need a good bike. My inclination would be to put one battery in a frame triangle box, the other on a rear rack. With that much weight, you may have problems with bent spokes and such if you have bad roads.

With a stock dd motor kit, you'd have 27 mph when you need it, and at 25 mph you would have just enough range.

Just one pingbattery though, if you can find a charging place.