Is it as simple as 4000 watts divided by 72 volts equals 55 amps assuming the battery output is capable of 55amps without breaking a sweat and the controller is rated at no more than 55 amps output.Jonno said:How many amps can your battery output?
the bms has nothing to do with the controller. the bms only has 1 job: protect the battery.eMark said:Is it as simple as 4000 watts divided by 72 volts equals 55 amps assuming the battery output is capable of 55amps without breaking a sweat and the controller is rated at no more than 55 amps output.Jonno said:How many amps can your battery output?
Just because the motor is rated at 4000 watts doesn't mean it should be taxed at 4000 watts OR does it if there's a built-in safety factor above 4000 watts ?
If controller is no more than 55 amp rating then a BT programmable BMS rated at least 75 amps should provide sufficient buffer.
Don't see how you arrive at that from his post. Yes it's a good idea to oversize the BMS (250a BMS) with a 200a discharge battery, but why in the world would you use a 300a controller instead of a 200a controller when the battery is only rated at 200 amp discharge.Jonno said:So what you are saying is a 200 amp discharge battery and a 200 - 250a bms is ok for a 300a controller?
I am not sure. I have been looking online at different 72v options with different BMS ratings. 50A, 60A, 70A, 80A, and 100A. I want to choose the right one that would be a perfect fit for my 4000w motor.Jonno said:How many amps can your battery output?
Jonno said:So what you are saying is a 200 amp discharge battery and a 200 - 250a bms is ok for a 300a controller?
Been there done that and it doesn't work. The battery shuts down.
(got one here for BMS bypass at the moment)
pongyboy1 said:I am not sure. I have been looking online at different 72v options with different BMS ratings. 50A, 60A, 70A, 80A, and 100A. I want to choose the right one that would be a perfect fit for my 4000w motor.Jonno said:How many amps can your battery output?