Generator Power Calculator

Generator Power Output

Generator output power depends on voltage, current, power factor, and efficiency. AC generators require a power factor (PF) because voltage and current may not be in phase. DC generators use PF = 1.

Generator Power Formula

P = V × I × PF × η

\(P\) is real output power (watts), \(V\) is voltage, \(I\) is current, PF is power factor (0–1), and η is efficiency as a decimal. Apparent power is \(S = V \times I\) (volt-amperes).

Example: 230 V, 10 A, PF 0.85, and 90% efficiency give \(P = 230 \times 10 \times 0.85 \times 0.9 = 1768.5\) W.

Related Tools

See the DC Wire Size Calculator and Power Calculator for related electrical calculations.

Frequently Asked Questions

What is power factor?

Power factor is the ratio of real power to apparent power (cos φ). A PF of 1 means voltage and current are in phase. Inductive loads like motors reduce PF below 1.

Why is efficiency included?

Generators convert mechanical input to electrical output with losses. Efficiency accounts for heat, friction, and core losses. Enter efficiency as a percentage (e.g., 90%).

How is DC different from AC?

DC systems have no phase angle, so power factor is always 1. The formula simplifies to P = V × I × η.

What is apparent power?

Apparent power S = V × I is measured in volt-amperes (VA). Real power P = S × PF is measured in watts. This tool shows both values.

Can I size a generator from load power?

Yes. Enter your load voltage, current, and power factor, then solve for power. Choose a generator rated above the calculated output with margin for starting loads.

Report

Generator Power Output

Generator Power Formula

Related Tools

Frequently Asked Questions

Related Tools

Recent Visits