Look at the motor nameplate and it shoud have the amp draw on it. If the nameplate is missing, then the amp draw depends on what type of motor it is.
The basic calculation to get you in the ball park would be as follows:
1 HP = 0.75 KW
7.5 HP = 5.63 KW
Assume the efficiency of the motor is 80%, then the power supplied will need to be 5.63/0.8 = 7.04 KW
amp draw = 7040/220 = 32 amps
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For calculation purposes the electrical code book states that a 7.5 HP motor draws 40 amps.
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read the name plate on the motor
50 Amps Single Phase 20 Amps Three Phase
The formula you are looking for is I = W/E. Amps = Watts/Volts.
Then you are trying to get more HP out of the motor that it can supply. Back off on the load that the motor is driving or put a bigger motor onto the load.
depends on the number of cans and the specific gravity of the electrolyte