Originally Posted by Andrew Grace
the specification sheets
are showing that running at 50% (24v) its will generate 5HP of power which is plenty to drive the small bauer compressor and will draw only 100 Amps...
One horsepower is equal to 745.7 watts. That means that 5 hp is 3728.5 watts. At 12 volts, that is 310+ amps. This is all assuming perfect, frictionless conversion, which of course is impossible. Hence it is going to be MORE amperage than that. Captain
Bill was actually a bit conservative with his numbers, and his data IS correct.
Running the motor at 24 volts doesn't really change things--it just alters the volts versus amps equation, but you still need the same number of watts coming out of your battery bank. You still need a monstrous battery bank, and something to charge it with.
By the way, if the spec sheet actually says that it can generate 5hp on 100 amps at 24 volts then it is LYING! At 24 volts, 100 amps will produce less than 3.25 hp. Simple math, and inescapable physics.