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575 Posts
On the surface I agree with the formula volts x amps =watts /746 = HP
However it requires further explanation otherwise inexperienced people will mis interpret it.
It needs a statement to say the volts and amps used as inputs to the formula need to be at the peak of the motor's power (generally somwhere mid rev range). The volts rise and the amps drop as the motor revs rise.
If there is a system that sees maximum amps and volts at the same instant then the simple formula would be accurate. But its not the case for most systems.
For example my maximum volts are 172v while my maximum amps are 1000amps. Applying the simple formula would indicate my motor is 230HP. This is not the case. The peak for my motor is actually 100HP because the amps drop off as the voltage rises.
I think a lot of people use the simple formula and then quote the HP making their system sound more impressive than it really is.
However it requires further explanation otherwise inexperienced people will mis interpret it.
It needs a statement to say the volts and amps used as inputs to the formula need to be at the peak of the motor's power (generally somwhere mid rev range). The volts rise and the amps drop as the motor revs rise.
If there is a system that sees maximum amps and volts at the same instant then the simple formula would be accurate. But its not the case for most systems.
For example my maximum volts are 172v while my maximum amps are 1000amps. Applying the simple formula would indicate my motor is 230HP. This is not the case. The peak for my motor is actually 100HP because the amps drop off as the voltage rises.
I think a lot of people use the simple formula and then quote the HP making their system sound more impressive than it really is.