Formula for sizing a 30 HP Electric Oil Pump Jack motor

pvspencer63 said:
480V
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As far as the branch circuit goes I'm guessing that it should be sized like any other motor branch circuit. According to T430.250 a 30 HP motor at 480 volts draws 40 amps. Maybe someone with PV experience can tell us what is required as far as the size of the system required to allow the motor to start and run.
 
pvspencer63 said:
What is the formula for sizing a 30 HP Electric Oil Pump Jack motor in an Oil field? The system is off-grid.
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Sizing the MOTOR? You already say it is 30HP, I don't understand the question.

Sizing the CIRCUIT for the motor? Article 430.

Sizing the PV array to operate the motor? That's a LOT more complicated.
Does it use the full 30HP (i.e. how many actual WATTS will it consume under the expected load)? What is the motor efficiency? Is it an inverter driven motor? What's you location's average daily solar irradiance? How long does it need to run? Is there a battery system with it? Will you need to recharge the battery while the pump is running at the expected load? What are the efficiency losses of the solar inverter, losses in the wiring, transformers etc.?
 
100-amp 480V/3P would work. 30HP at 480V = 40FLC per table 430.250. FLC x 2.5 = 100A breaker.
 
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