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# Calculate Size of Diesel Generator

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## Size of Diesel GenSet

This spreadsheet intend to calculate size of needed diesel generator according to the following input parameters:

1. System Voltage ( P-P ) in Volts
2. System Voltage ( P-N ) in Volts
3. Future Load Expansion in %
4. Average Intermittent Use of Equipment (0.7 To 1.0)

You are about to enter following information for each consumer you have in your consumption calculation:

1. Equipment (name)
2. Load Type (linear, non-linear or motor)
3. Supply (1ph or 3ph)
4. Qty (num.)
6. Starting P.F
7. Running P.F
8. Diversity Factor
9. Motor Starter (Dol, Y-D, auto-transformer, soft starter or frequency converter)

Calculated results consist of:

1. Size of Diesel GenSet for linear, Non-linear Load
2. Size of Diesel GenSet for motor load
3. Diesel GenSet Efficiency
4. UPL (unit per liter) of Diesel GenSet
5. Unit power cost of Diesel GenSet
6. Approximate fuel consumption

1. Fermin
May 11, 2018

Hi guys.
I am thinking to star a 3 phase motor 75 kw, 460 VAC with a Diesel generator (144 HP rated ), 460 VAC using a soft starter.
Sombody can help me if this is posible?

2. mina
Apr 08, 2018

hey guys

how can i calculate the Diversity Factor in a utility with 3 3ph motors that are working simultaneously?

• Mansour Essaïh
Oct 24, 2020

Better late than never.
The 3 mortors are working simultaneously, so the diversity factor Kd = 1 (*)

If ypu want to estimate the energy consumption per day, you have to use loading factor or utilization factor generaly = 0.80. But if you know the power absorbed by the machine driven by the electric motor, then, the utilization factor Ku = Machine power/Nominal motor power.

The global factor Kg = KdxKu.

If Ku = 0.8, then Kg = 1×0.8 = 0.8.

If the unit nominal power of your motors is Pn = 22 kW, the total power absorbed is : 3×0.8x 22 = 52.8 kW.

If your 3 motors work 8 hours per day, then the energy consumed per day is : E = NxKgxPnxt = 3×0.80x22x8 = 422.4 kWh.

3. vijay
Feb 08, 2018

Calculations shown for DG sizing is having minor errors, starting KVA is multiplied twice.

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