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How To Choose Correct Battery, Controller & Motor?
Battery parameters: voltage, capacity, discharge rate.
For example: 3S (11.1V), 4200mAh, 30C
Controller parameters: output capability, for example: 80A
Motor parameters: maximum current (A), maximum voltage (V), KV value. For example: LBP2860, maximum current 80A, maximum voltage 17V, 3400KV
Principles of batteries and controllers:
1) The maximum voltage of the battery cannot exceed the maximum load voltage of the controller.
2) The battery current continuous output is greater than the controller's maximum continuous current output.
In the above example, the current output of the battery is 4200X30/1000=126A, and the controller is 80A, so the combination is no problem, the battery can even be matched to the 120A controller.
Principles of batteries and motors:
1) The motor operating voltage is determined by the controller, and the controller voltage is determined by the battery output, so the battery voltage should be equal to or less than the maximum voltage of the motor.
Controller and motor:
1) The maximum voltage of the controller cannot exceed the maximum voltage that the motor can withstand.
Question 1: Is controller 80A unable to exceed the maximum current of the motor?
Answer: If the maximum current of the motor is 60A, the controller with the maximum current of 80A is no problem. The controller does not work directly to the 80A, but only says that the maximum can reach 80A. If the motor has a maximum current of 60A, it will receive 60A from the controller at most, no problem.
Question 2: If equipped with a 120A controller, it will result in wasted controller power? If equipped with a 60A controller, will the controller be insufficient?
Answer: If the motor is up to 60A, then a 120A controller is a waste of resources. The working current is determined by the motor. The motor needs 60A, and the controller inputs 60A, so the controller is a little larger than the motor current.
When the discharge current of the battery does not reach the current of the controller, the controller will not perform at the highest performance, and the battery will generate heat, causing fire and explosion, so in general, the current of the battery is required to be greater than the current of the controller.
Battery rated power >= controller rated power > motor rated power
Battery power determines whether the controller and motor can be driven.
The battery capacity determines the system's operating time and determines how far the bike can run.
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