How much Range should i get?

[Denomiester]

i am brand new to electric riding, heres my dilemma.

I intend on purchasing a brand new Phoenix cruiser rear hub hotor, 3600 watts is my outupt at a 50 amp controller

How much range should i get with a 72 volt 15AH LiFePO4 battery?

Im 140 lbs, Im not towing anything, i have no accesories like lights etc. My quoted top speed is 40+mph... but i wont be full throttling my bike, i want to average 35mph. I wish to get 20 miles per charge at 80% D.O.D. if possible. Will i have a satisfactory battery to do this?

And by the way, i do intend on pedalling up hills, as i know the draw on them is high, and i tuck my body in an aerodynamic position when im riding.

Im putting $3000 into this bicycle, but i dont care if i have to put in an extra 200 for a better battery, a 72 volt 20AH is my next level up.

 

[SamTexas]

Are you sure you have a bike that can carry a 72V 20AH LiFePo4 battery?

In order to average 35mph, you will need to ride at 40mph or faster whenever possible. Is your bike capable of handling that speed? Have you ever been on a bicycle riding 30mph for more than 10 continuous minute?

 

[Denomiester]

Are you sure you have a bike that can carry a 72V 20AH LiFePo4 battery?

Yes sir, i can make it fit in the triangular part of the bicycle frame, it doesnt have rear suspension so i have the most room possible.

And as for the handling part, my last bike had a 66cc 2 stroke gas engine with a shift kit, it handled 40mph quite well, i have 480miles on it. and that was only a $220 bicycle

 

[SamTexas]

Great. You know what you're getting into. With a $3,000 budget, you should be able to get what you want. Just hang on, the "power" people will be along soon with their recommendations.

In the mean time, enjoy this "40mph club" thread:
http://endless-sphere.com/forums/viewtopic.php?f=3&t=18088

 

[Denomiester]

I hope i covered everything the "power fellas" need to know. I think i can get a picture of my gas bike up here soon.

 

[dogman dan]

You should go for the 20 ah. Battery from where? 50 amps is a lot for a pingbattery, for example.

Range is going to vary wildly with the riding situation with 50 amps at your beck and call. Use 50 amps, and you'll be getting 10 miles out of 72v 20 ah. But you'd have to be climing a loooong hill to use 50 amps continuous. So you should be able to use 25 amps much of the time, and get your 20 miles easy.

If you don't have the controller bought yet, get one set to 30 amps, to use a 72v 20 ah pingbattery.

 

[Denomiester]

Pingbatteries? Im not sure thats the type ill be getting. I have been speaking to a rep from Electric Rider and whatever battery type they are testing is what im getting. He's gonna hook me up with a custom system (its net even availabel on the website yet) it includes the battery, motor, BMS, Charger, the works basically.

I am however waiting untill next spring to order my system. Central Ontario speaking here, home to a proud 6-8 feet of snowfall a year. If i did it now i would inly get 1 week of riding given shipping times.

 

[NeilP]

I have a 5304 rear, so similar to the Phoenix, I think yours is the slightly faster than mine
With 84v 20ah LiPo I comfortably do 26 miles with virtually no pexalling
My average speed on the ride to work is usually around 24. to 25 with a Max of 42 to 44 mph
Roads and stop / go riding / cycle paths do not allow a higher average speed
This is with a 65 amp controller
if you have a setup rated at 65 amp. you will not get that as a continous current. I get peaks of 65-68 amps, but max continous as viewed on the Cycle Analyst is never above 41 amps, even under load going up hills at 30

The back EMF limits the current once the motor is running at speed

If you have the option of 20ah definetly go with that

 

[neptronix]

15ah of lifepo4 will buckle under the load and perform like crap unless we are talking about A123s.
Good question about the range. Efficiency at 40mph is awful. You will get 1 mile per AH or less at full speed. Down to 20mph and you may get 2 miles per AH if you have a good battery that doesn't sag like crazy + pedal the whole time. But it is hard to restrict yourself with all that power..

Tucking in and pedaling won't help you much with a 50 amp controller. Your legs may contribute to about 10% of the power, tops with those kinds of amps. This is not like a gas bike, it is mega torque until the poop-out zone at higher RPM.

 

[Denomiester]

Alrighty well, heres what im getting now... This is my official purchasing plan.

2, thats right, TWO Phoenix II Cruisers at 48V 40Amp. Giving me a 2 wheel drive, 4000 Watts output.
Parts im getting
2 of the following: BMS, Controller, Throttle, 48V 15AH Lithium Manganese

Quoted top speed is 80Kph (I'm 140lbs) Shit tonnes of torque, and 60Km of Range running it hard (60kph plus cruising speed)

Am i crazy?

 

[itchynackers]

Around here, your just normal. Like the others have said, if you can limit your amps, then your battery will survive, and you'll get your range. A bigger battery is always better for longevity/range.

 

[Denomiester]

i wonder if i would still be normal with a dual 72A 40A Watt bike. Lol I'd DIE.

I'm thinking ill let this topic fade out, you guys gave me the extra help i needed