I used to think that two performance disadvantages of higher battery voltages would be:
- Heating up quicker on lower speeds
- Less range on lower speeds (compared to a same Wh lower voltage battery)
However when I take a look at the ebikes.ca Motor Simulator, I cannot really find a performance disadvantage of higher voltage (when comparing to a same Wh lower voltage battery)
According to the simulator, when maintaining a for example 30kph at 9 percent uphill, both systems in this example would need around 1000W motor power and around 1250W battery power.
Here is the link to this example: http://www.ebikes.ca/tools/simulator.html?bopen=true&motor=MX4503&batt=cust_72_0.05_12&motor_b=MX4503&batt_b=cust_48_0.05_18&cont=cust_150_350_0.03_A&cont_b=cust_150_350_0.03_A&hp=0&hp_b=0&wheel=20i&wheel_b=20i&throt=12&throt_b=18&grade=9&grade_b=9
The 1250W battery power would be 72V*17.4A for system A and 48V*26A for system B. However the phase amps would be exactly the same (around 40 phase amps). Heating and range (of two batteries with same amount of Wh) would be the same.
So is there any performance disadvantage of a higher battery voltage?
- Heating up quicker on lower speeds
- Less range on lower speeds (compared to a same Wh lower voltage battery)
However when I take a look at the ebikes.ca Motor Simulator, I cannot really find a performance disadvantage of higher voltage (when comparing to a same Wh lower voltage battery)
According to the simulator, when maintaining a for example 30kph at 9 percent uphill, both systems in this example would need around 1000W motor power and around 1250W battery power.
Here is the link to this example: http://www.ebikes.ca/tools/simulator.html?bopen=true&motor=MX4503&batt=cust_72_0.05_12&motor_b=MX4503&batt_b=cust_48_0.05_18&cont=cust_150_350_0.03_A&cont_b=cust_150_350_0.03_A&hp=0&hp_b=0&wheel=20i&wheel_b=20i&throt=12&throt_b=18&grade=9&grade_b=9
The 1250W battery power would be 72V*17.4A for system A and 48V*26A for system B. However the phase amps would be exactly the same (around 40 phase amps). Heating and range (of two batteries with same amount of Wh) would be the same.
So is there any performance disadvantage of a higher battery voltage?