3. (EnL - EfL)
Percent of Regulation = X 100
EfL
Where:
EnL = The no-load terminal voltage
EfL = The full-load terminal voltage of the
generator.

4. For example,
To calculate the percent of regulation of a
generator with a no-load voltage of 462 volts
and a full-load voltage of 440 volts

5. Given:
No-load terminal voltage EnL = 462 V
Full-load terminal voltage EfL = 440 V

6. (EnL - EfL)
Percent of Regulation = X 100
EfL

7. (462V - 440V)
Percent of Regulation = X 100
440V

8. 22V
Percent of Regulation = X 100
440V

9. Percent of Regulation = 0.05 X 100
Regulation = 5%

10. Note:
The lower the percent of regulation, the better
the generator.