Help with choosing the right cell

[DK1800]

I want to use a Qs205 motor and want to run 70km at 70kmh, i tryied to dimension Volts, Amps, Cicle and AmpH by myself but i still unconfortable about making mistakes and buying the wrong cell to make the battery. I saw a little about some Lifepo4 with 3.2v 105ah and 105A.

Here's my questions:

What controller should i use?
Is this cell enougth to handle my use?

 

[docw009]

I know nothing about high power and speed, but it always makes sense to go with what the QS website says. Why don't you buy their controller/motor combo together? Might cost a little more, but that's better than trying to match parts that might not be optimal,

qs-motor.com – QS205 3000W V3 E-Bike Moped Conversion kits

And ask them what they recommend for battery.

 

[DK1800]

and what about the battery?

 

[E-HP]

I want to use a Qs205 motor and want to run 70km at 70kmh, i tryied to dimension Volts, Amps, Cicle and AmpH by myself but i still unconfortable about making mistakes and buying the wrong cell to make the battery. I saw a little about some Lifepo4 with 3.2v 105ah and 105A.

Here's my questions:

What controller should i use?
Is this cell enougth to handle my use?

You need 3000W to maintain 70kmh. So, you need a 3kWh battery to do 3000W for an hour. That's close to a 50lb/21kg battery. Do you have room for that?

It will weigh a lot more if you're going with lifePO4.

 

[DK1800]

what cells do you recomend to make it lighter than with lifepo? and the cicles in this case would be 1C right?

 

[E-HP]

You ask a question, I answer a question. I ask a question, you ask another question. You should probably use Google AI if you want a one way dialogue.

 

[DK1800]

sorry mate, i actually answared your question but maybe my cellphone had any conection problem and didn't sent it.

I do have space to fit the battery, actualy thats not the issue. I dont want to buy the wrong cells that discharge too quickly or don't provide the minimum to reach 70km 70kmh.

I dont have money to make tests and importing this batteries is kind of hard to my country

 

[E-HP]

docw009 provided you with solid advice. QS will be able to determine the requirements for your system and the required specs for the battery. You can't choose anything before you know that.

 

[wturber]

I would also add that batteries will lose capacity over time. So you should make sure whatever it is that you decide on has some headroom if you want to maintain your range and speed capabilities.

Also, check what rate of draw the battery is rated for. If you draw current at a substantially greater rate than what the battery/cells were rated at , you won't get the full rated capacity. Temperature can also have an effect on capacity. Cold weather generally reduces capacity. You'll want to keep all of these things in mind when planning out what battery to use. Doing so may cause you to reconsider your requirements as well. For instance, if the range is for a common "up and back" trip, maybe you can carry less battery by keeping a charger on board and charging at the destination?