How To Find Kilowatts From Amps And Volts

Information technology'southward quite piece of cake to convert kW to amps and amps to kW in a simple 1-stage DC circuit (compared to a 3-phase power adding). That requires merely the bones Ohm'southward law; yous can simply use our kW to amps calculator here for conversion.

In a 3-stage Air-conditioning circuit (commonly a iii-stage motor), converting amps to kW and kW to amps is not all that easy. To simplify the whole matter, we take created ii three-phase power calculators:

Starting time 3-phase ability reckoner converts kW to amps. For this, we use the iii-phase ability formula with the 1.732 gene and ability factor (nosotros'll cover the formula equally well). You can bound to 3-phase kW to amps figurer hither.
Second iii-phase ability calculator converts amps to kW in much the aforementioned way. We apply the archetype 3-stage motor current calculation formula. You lot can jump to three-phase amps to kW formula and reckoner here.

To become an thought of how these calculators piece of work, here is the screenshot of the 3-phase ability figurer:

3 phase power calculator to convert motor amps to kw — Example of how 1st calculator works: A 3-phase motor that draws 90A and runs on a 240V excursion with a 0.8 power factor will produce 29.93 kW of electrical power.

Before we cover the nuts, let'southward practice a quick case to illustrate how calculating power on a 1-phase vs iii-phase excursion works.

Case: Permit's say we accept a vi kW air conditioner on a 120V circuit. Here's how many amps does it depict:

On a 1-phase circuit, vi kW draws 50 amps.
On a three-phase circuit (with a ane.0 ability factor), the 3-phase power figurer shows that the same six kW apparatus draws 28.87 amps.
On a iii-stage circuit (with a 0.half-dozen power cistron), the 3-phase power calculator shows that the same 6 kW appliance draws 48.11 amps.

To see why we get different amperage on a 3-phase circuit, let'south first cheque how these amps are calculated using the iii-phase ability formula:

3-Phase Power Formula

three-Phase Ability Calculator: Amps To kW (1st Calculator)
- 3-Phase Current Formula
3-Phase Motor Amps Calculation: kW To Amps (second Calculator)
- - - Related posts:

3-Phase Power Formula

Here'south the uncomplicated formula we use to calculate power on a i-phase DC and AC excursion:

P (kW) = I (Amps) × V (Volts) ÷ 1,000

Basically, we merely multiply amp by volts. The 'ane,000' factor is in that location to catechumen from W to kW; we want the resulting ability to be in kilowatts. 1 kW = ane,000W.

Compared to this, the 3-phase power formula is a bit more circuitous. Here'southward the 3-phase power equation:

P (kW) = (I (Amps) × V (Volts) × PF × 1.732) ÷ 1,000

As nosotros tin can meet, the electric power in the 3-stage AC circuit depends on:

I (Amps): Electrical current, measured in amps. The more amps we have, the more power we have in a three-phase circuit.
V (Volts): Electrical potential, measured in volts. The more than volts we take, the more power nosotros have in a three-phase circuit.
PF: Ability factor, it'southward a number between -1 and 1 (0 and one in practice). Power factor is defined every bit a ratio between real ability and apparent power. If current and voltage are in phase, the ability factor is 1. In the 3-phase excursion, current and voltage are not in phase; thus the ability factor volition be anywhere between 0 and one. This accounts for the real/apparent power ratio and is sometimes expressed as RMS current. The higher the PF, the more than kW a 3-phase excursion has.
1.732 factor: This is a abiding in the 3-stage power calculation. It comes from the derivation of this equation. To exist exact, nosotros get a square root of 3 (√three).
1,000 factor: This is another abiding. Information technology converts watts into kilowatts considering we usually prefer to deal with kW instead of W.

Because we need to use the ability factor to summate the kW from amps, this formula is also known equally the 'iii-phase power factor formula'.

We can utilise this equation to blueprint the 1st calculator: 3-phase ability reckoner (check beneath).

Note: Afterward on, we will also see how we can use the 3-phase electric current formula to design a 3-stage motor amps computer. That one converts kW to amps in 3-phase circuits, very of import in electrical motor pattern.

3-Stage Power Estimator: Amps To kW (1st Calculator)

Y'all can freely use this reckoner to convert amps to kW in a 3-phase circuit. You need to input the amps, voltage, and the power factor (it'south betwixt 0 and 1, specific for each circuit):

As you can see, the more amps and volts y'all take, the more than powerful 3-phase electric motor y'all accept. Quite similarly, a higher power gene is proportional to higher power output.

Yous can utilize this example to run across how the 3-phase power calculator works: A 100 amps motor on a 240V 3-phase circuit with a 0.ix power factor produces 37.41 kW of electric ability. Insert these iii quantities in the calculator, and y'all should get the aforementioned event.

At present for the 3-phase motor current calculation formula:

iii-Phase Current Formula

As nosotros take seen, this iii-phase power formula calculates how many kW of electric power will a motor have given its electric current:

P (kW) = (I (Amps) × V (Volts) × PF × 1.732) ÷ 1,000

To effigy out how many amps does a motor with certain kW power accept, we have to rearrange this equation a chip. Nosotros get the 3-phase current formula similar this:

I (Amps) = P (kW) × i,000 ÷ (V (Volts) × PF × i.732)

Using this power formula, nosotros can, for example, practice a three-phase motor kW to amps adding. Exercise note that if a 3-phase motor with lower voltage and lower power factor will draw more than amps to produce the same power output.

Here is the estimator based on the three-stage current formula:

3-Phase Motor Amps Calculation: kW To Amps (2nd Calculator)

To summate the amps from kW, y'all demand to input the kW, voltage, and power factor of a 3-phase motor. The computer will dynamically calculate the current (amps) based on your inputs:

You lot can apply this example to cheque if y'all're correctly using the 3-phase current calculator: Allow's say we have a 200 kW motor on a 480V iii-stage circuit with a 0.viii power factor. Such a motor has a 300.70 amp depict. Y'all tin insert these numbers into the calculator and see if you lot get the correct result.

Nosotros use a three-phase excursion for heavy-duty tasks. For case, you lot tin check how long does it have to fully charge a Tesla with a supercharger, and you will quickly realize that yous need some additional voltage and a whole lot of amps there.

All in all, we hope these calculators help yous determine the power and electric current specifications of electric motors. If y'all have whatsoever questions, you tin use the comments below and we'll try to help you out.