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Originally Posted by lakedude
If you can multiply by 12 a DC amp meter will do the job.
Power = ElectroMotive Force (EMF) times Current.
or
Watts = Volts times Amps
You already know you have (roughly) 12 volts so all you need is the amps.
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Yeah, unfortunately I got the motor used and it came with no instructions, and there's nothing on the motor or control unit that says what the draw rating is. Looking at the above post however where it seems that such units for DC can cost around $100, it's not looking like there's a cheap ($20-30) device that does the same thing as an A/C Kill-A-Watt for 12v DC.