Generator Sizing Calculator for Construction

Enter Project and Electrical Details

Project Name

Project name is required.

System Voltage (V)

Phase

Frequency (Hz)

Power Factor

Typical construction generators use 0.8 for mixed loads.

Continuous Factor

Common planning factor: 1.25 for continuous duty.

Future Load Growth (%)

Helps cover added tools, shifts, and seasonal needs.

Altitude (m)

Higher altitude may reduce available generator output.

Ambient Temperature (°C)

Hot conditions can reduce alternator and engine capacity.

Manual Derate Override (%)

If known from manufacturer curves, enter it here.

Include motor starting surge when sizing

Tip: Use Demand % to model non-simultaneous usage. Set Surge Factor to 1 for resistive loads.

Load Name

Enter a load name.

Watts