Originally Posted by The7

The stock controller was tested at 36 V battery voltage:

No-load test results on AL1020

A)Using 24 V 12 Ah SLA Battery

1) Quiescent Current = 0.06A

2) Max Throttle
Max No-load Speed = 30.7 km/h
Current = 1.22 A
Then input power = 24X1.22 = 29.3 W

B) Using 36 V supply ( 24V 12Ah + 12V 14Ah)
3) Quiescent Current = 0.07 A

4) Max Throttle
Max No-load Speed = 45.7 km/h
Current = 1.60A
Then input power = 36X1.60= 57.6 W

5) Partial Throttle at Speed = 30.7 km/h
Current = 0.95A
Then input power = 36X0.95= 34.2 W

Comments:
1) The 24V stock controller was used for both 24V and 36V test.
2) Quiesent current is only increased slightly from 0.06 to 0.07A.
3) Max no-load speed is approximately proportional to the battery voltage.
4) For the same speed, current for 36V battery is lower. But the input power in higher. This means the heating of the FET would not be a problem.
5) It seems that the stock controller could work at 36V. The 3 big capacitors are rated at 100V 100uF while the voltage ratings of the FETs are unknown because they are potted inside the casing.

Road test with 36 V will be coming soon.