# Generator full load current calculator

The generator current calculator calculates the full load current of a single phase and 3-phase generator.

## See Also

- Cable sizing calculator AS/NZS3008
- Maximum demand calculator AS/NZS3000
- Arc Flash Calculator IEEE 1584

## Parameters

**Rated voltage (V**The rated voltage of the generator in volt (V)._{p}):**Phase:**Specify the phase arrangement. 1 Phase AC or 3 phase AC.**Generator rating (S):**Specify the the generator rating in kW or kVA. When the rating is in kW, you also need to specify the power factor cos(Φ), which is a number between 0 and 1. You can use approximately 0.80, if the load consists of motors only. For purely resistive loads the power factor cos(Φ) is 1.

## How to calculate the full load current of a 3-phase generator?

### The full load current for a 3-phase generator specified in kW is calculated as:

\(I=\displaystyle\frac{1000 \cdot S_{kW}} {\sqrt{3} \cdot V_{LL} \cdot \cos{\phi} }\)

Where,**S**is the generator rating in kilo-watt (kW)._{kw}**V**is the generator line-to-line rated voltage in volt (V)._{LL}**cos(Φ)**is the power factor.

**50 kW, 480 V, 3-phase**generator. The estimated load power factor is

**0.85**.

\(I=\displaystyle\frac{1000 \cdot 50} {\sqrt{3} \cdot 480 \cdot 0.85} \)

**I = 70.8 A.**

### The full load current for a 3-phase generator specified in kVA is calculated as:

\(I=\displaystyle\frac{1000 \cdot S_{kVA}} {\sqrt{3} \cdot V_{LL} }\)

Where,**S**is the generator rating in kilo-volt-ampere (kVA)._{va}**V**is the generator line-to-line rated voltage in volt (V)._{LL}

**50 kVA, 480 V, 3-phase**generator.

**\(I=\displaystyle\frac{1000 \cdot 50} {\sqrt{3} \cdot 480 }\)**.

**I = 60.1 A.**

## How to calculate full load current of a single-phase generator?

### The full load current for a 1-phase generator specified in kW is calculated as:

\(I=\displaystyle\frac{1000 \cdot S_{kW}} { \cdot V_{LN} \cdot \cos{\phi} }\)

Where,**S**is the generator rating in kilo-watt (kW)._{kw}**V**is the generator line-to-neutral rated voltage in volt (V)._{LN}**cos(Φ)**is the power factor.

**2 kW, 120 V, 1-phase**generator. The estimated load power factor is

**0.85**.

\(I=\displaystyle\frac{1000 \cdot 5} { 120 \cdot 0.85} \)

**I = 19.6 A.**

### The full load current for a 3-phase generator specified in kVA is calculated as:

\(I=\displaystyle\frac{1000 \cdot S_{kVA}} { \cdot V_{LN} }\)

Where,**S**is the generator rating in kilo-volt-ampere (kVA)._{kw}**V**is the generator line-to-neutral voltage in volt (V)._{LN}

**2 kVA, 120 V, 1-phase**generator.

**\(I=\displaystyle\frac{1000 \cdot 50} { \cdot 480 }\)**.

**I = 16.7 A.**

## Frequently asked questions

### How to calculate the full load current of a generator?

For a three-phase generator, the full load current is calculated as I = 1000 × S / (√3 × V). Where,

**S**is the generator rating in kilo-volt-ampere (kVA), and**V**is the generator rated voltage in volt (V). For a single-phase generator, the full load current is calculated as: I = 1000 × S / V. Try it with this calculator' .### How many amps is a 3000 watt generator?

If it is a 3000 watt (3 kW), single-phase, 120 V generator, and the allowable load power factor is 0.8, then the current will be: I = 3000 / (120 × 0.8) = 31.25 A.

### How many amps is a 10000 watt generator?

If it is a 10000 watt (10 kW), 3-phase, 120 V generator, and the allowable load power factor is 0.8, the current will be: I = 10000 / (√3 × 120 × 0.8) = 60.1 A. If it is a 3-phase- 240 V generator, the current will be: I = 10000 / (√3 × 240 × 0.8) = 30.1 A.

### How many amps is a 7500 watt generator?

If it is a 7500 watt, single-phase 120 V generator, and the allowable load power factor is 0.8, the current will be: I = 7500 / (120 × 0.8) = 78.1 A.