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It depends on the motor, and whether there is already pressure in the tank.

Inrush (startup) currents can easily be 10x the running current.

So, you need to know what the running current is, then allow at least 10x that value for startup.

Be aware that 1.5 HP is around 1.1 kW, which implies about 10 amps on a 110 V line, about 4~5 A on 240 V, but your motor will be less than 100% efficient.

so... on 110 V, maybe 100 A (!) peak, on 240 V, maybe 50 A.

If you can measure the motor's DC resistance, then work out what current that would pull at line voltage, that will be the *maximum* possible current that the motor could draw.

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Q: What is the start up amp of 1.5 horse air conditioner?
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