If I understand your description, this is a pump shaft driver that sits
on top of the well. There are two standard ways to check the output of
the motor and pump.
Wire to water efficiency measurement is done by taking the discharge
pressure and gpm and comparing that HP with the voltage and current at
full load.
A horsepower is 550 ft. lb./second. Water weighs 8.34 lb./gal. 1 ft. of
head =0.433 psi. You must measure the flow and pressure at the well
head. Remember to add the depth of the water in the well to calculate
the lift to the well head.
Your irrigation well should have a Parshall flume or weir to measure
the flow. You need a pressure gauge at the well head, then add the lift
pressure to it.
If this is all too complicated, find an engineer who will run the test,
or a fireman who knows how to test fire pumps. They should be able to
test the well for you.
Bugs