I have as well. And the air temperature can vary the HP readings 100hp in some cases. You get as close to actual parameters as you can, or you are just fooling yourself. Why have a result of 3hp at 20v constant when no battery can do said load and hold 20v? (random #s) It would be useless info as far as real world power. It could be used to compare different motors, but one motor would pull the voltage down more than another in the reak world, thus altering the #s greatly in some cases.