# How do you calculate amps for a startup?

## How do you calculate amps for a startup?

You can multiply the code (amps) times the Horsepower of motor to determine starting amps. Find a list of codes and the amps here. Cycles (Hz) – All U.S. electrical appliances run at 60 cycles per second.

### What is startup amps?

Startup current is the amperage / power draw peak that occurs when an appliance is operating in its most strenuous condition or cycle.

#### What is the starting current of a motor?

Motor Starting Currents Typically, during the initial half cycle, the inrush current is often higher than 20 times the normal full load current. After the first half-cycle the motor begins to rotate and the starting current subsides to 4 to 8 times the normal current for several seconds.

How is inrush current calculated?

Inrush current calculations: Approximately inrush current I(peak) is equal to the ratio between the root 2 times of maximum applied voltage to DC winding resistance. This calculation gives you the approximate value of the inrush current to understand.

Is higher amps better?

Amps basically measure how effectively the motor cools itself, not how much power it has. With this in mind, more amps can be good because motors will run longer and won’t heat up as fast. Remember heat is what kills a motor.

## How much power does a 1.5 hp motor use?

So, 1.5 HP= 1119W=1.119KW or lets say 1.12 KW. So, we see power consumed by motor is 1.12 Kilo Watts.

### Why motor Take heavy current at starting?

At start, the reactance of the rotor is high because the slip of the motor is equal to unity. The value of Rr/s increase as the slip gets decrease. When the induction motor is started the rotor reactance is more than the rotor resistance and because of the large Xr/Rr ratio the motor takes large inductive current.

#### How many amps is a 1.5 hp motor?

HP 200 Volts 550-600 Volts
1/2 2.5 0.9
3/4 3.7 1.3
1 4.8 1.7
1.5 6.9 2.4

How many amps are in a HP?

AMP DRAW BASED ON HORSEPOWER

HP 1 Phase Amps
115 volt 230 volt
1/2 9.8 4.9
3/4 13.8 6.9
1 16 8

Why is the starting current of a motor high?