Input two of the three values into the calculator to compute the missing parameter for proper generator sizing.

3 Phase Generator Sizing Calculator

Enter your load and we’ll recommend a generator size in kVA.

By Load (kW)
By Amps
kW
A
— kVA
Recommended standard size: —
Show how this is calculated â–¾

3 Phase Generator Sizing Formula

The following equation is used to calculate the required generator size.

GS = (L / PF) * SF
  • Where GS is the generator size (kVA)
  • L is the total load (kW)
  • PF is the power factor
  • SF is the safety factor (typically 1.25)

To calculate the generator size, divide the total load by the power factor and multiply the result by the safety factor.

What is a 3 Phase Generator Sizing Calculator?

Definition:

This calculator helps determine the appropriate 3 phase generator capacity required to safely and efficiently power electrical loads, taking into account the load demand, power factor, and a built-in safety margin.

How to Use the 3 Phase Generator Sizing Calculator?

Example Problem:

The following example outlines the steps and information needed to determine the correct generator size.

First, decide which parameter you want to calculate by leaving the corresponding field empty. For instance, to calculate the generator size, input the total load and power factor while leaving the generator size field blank.

Next, determine the values for the total load and power factor. In this example, suppose the total load is 100 kW and the power factor is 0.8.

Finally, calculate the generator size using the formula above:

GS = (100 / 0.8) * 1.25

GS = 125 * 1.25

GS = 156.25 kVA

FAQ

What factors affect the sizing of a 3 phase generator?

The required generator size can be influenced by the total load demand, power factor, and additional safety margins to account for start-up surges and load variations.

Why is a safety factor used in the calculation?

Incorporating a safety factor ensures that the generator can handle unexpected spikes in power demand and provides a buffer for reliable and efficient operation.

Can this calculator determine values other than generator size?

Yes, by leaving one field empty, the calculator can compute the missing parameter, whether it is the total load, power factor, or generator size based on the provided inputs and the applied safety factor.