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

Voltage (V)

Generator rating
cosΦ

Parameters

• Rated voltage (Vp): The rated voltage of the generator in volt (V).
• 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,
• Skw is the generator rating in kilo-watt (kW).
• VLL is the generator line-to-line rated voltage in volt (V).
• cos(Φ) is the power factor.
For example, calculate the full load current of a 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,
• Sva is the generator rating in kilo-volt-ampere (kVA).
• VLL is the generator line-to-line rated voltage in volt (V).
For example, calculate the full load current of a 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,
• Skw is the generator rating in kilo-watt (kW).
• VLN is the generator line-to-neutral rated voltage in volt (V).
• cos(Φ) is the power factor.
For example, calculate the full load current of a 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,
• Skw is the generator rating in kilo-volt-ampere (kVA).
• VLN is the generator line-to-neutral voltage in volt (V).
For example, calculate the full load current of a 2 kVA, 120 V, 1-phase generator.

$$I=\displaystyle\frac{1000 \cdot 50} { \cdot 480 }$$.

I = 16.7 A.

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.