Confused about Battery BMS and motor ratings TSDZ8 750W

[Scottsub20]

Can I use a 52V20AH 2500mAh Li-on battery with 40A BMS (fits 1500W motor) with a 48V 750W TSDZ8? How about a 48V20AH 2500mAh Li-on battery with 50A BMS (fits 2000W motor}? I would think the TSDZ8 750W would only draw as much current as it needs regardless of the batteries capacity to deliver current? If someone could explain this to me I would appreciate it.

 

[ZeroEm]

Fear your lost in the noise and labels. You can use most any combination with in reason. Do need to match the Battery and controller voltage.
Motors you can feed until you melt them, the label on it does not make any difference. Motors are rated in Watts not Volts. 52V and 1500w motor is 28a so a 40A BMS should be fine. 48V and 2000w motor is 42a so 50A BMS seems good. Most motors can be ran at 50% higher than rating for short periods.

Batteries you need more information if you over use it or stress it then a short life it is. Need to find "maximum continuous discharge" what it can do with out hurting it. BMS should be rated for more than you will expect to need. Battery AH is an estimate of total energy a battery has, limited to how fast it is discharged.

The controller should fit the speed and power you expect to get out of your setup. less than BMS

The problem is we upgrade the weakest part then another part is then the weakest.

 

[Scottsub20]

Thanks. Can I use these batteries rated 1500W 40A BMS or 2000W 50A BMS with the TSDZ8 750W motor/controller? Or do I risk burning out the motor or controller by doing so?

 

[E-HP]

Thanks. Can I use these batteries rated 1500W 40A BMS or 2000W 50A BMS with the TSDZ8 750W motor/controller? Or do I risk burning out the motor or controller by doing so?

Youre battery capabilities should always be greater than the controllers requirements. The more margin, the better.

 

[docw009]

Thanks. Can I use these batteries rated 1500W 40A BMS or 2000W 50A BMS with the TSDZ8 750W motor/controller? Or do I risk burning out the motor or controller by doing so?

You could use a battery rated for 100A, but the TSDZ8 only pulls the current that you tell it to draw, up to the maximum limit of the controller. That was set by the motor designer and is enough to protect the motor under most riding conditions, The exception being pilot error. If the rider tries to use gearing that is too slow and lugs the motor, sure, it will get too hot. Stuff melts. That's rider's fault. You risk burning it out with a 20A BMS if you hammer the heck out of the bike,

Ride smart.

 

[Scottsub20]

Great. As long as I keep the the demands on the motor and controller reasonable then capacity of those batteries is not an issue.

 

[Chalo]

Great. As long as I keep the the demands on the motor and controller reasonable then capacity of those batteries is not an issue.

Find out the continuous discharge rating for each of the batteries you're considering. I try to limit my maximum discharge current (dictated by the controller) to less than half of that rating, for the health and longevity of the battery. I also charge up to 85% and refrain from discharging below 40% unless I have a good reason to do so.

The harder you stomp on your battery, the sooner it will perish.

The first battery I built for myself (using secondhand hybrid car cells of unknown age) has been soldiering away steadily since 2018.