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Originally Posted by AZCivic
There's gotta be some simple device that does it, or a way to measure it.
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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.