Pulley Formula
Engine Speed (RPM) |
= |
Pulley Diameter (Generator) |
|
Generator Speed 3600 RPM |
Pulley Diameter (Engine) |
||
Engine Speed 2400 (RPM) |
= |
Pulley Diameter (Generator) X |
|
Generator Speed 3600 RPM |
Pulley Diameter (Engine 7.0") |
||
2400 x 7.0 |
= |
16800 |
|
3600 |
3600 |
||
= |
4.66" |
||
The diameter of the pulley in this example should be 4.66". If the exact size of the pulley is not available, you must slightly adjust the engine speed to compensate for the pulley diameter. NOTE: The minimum engine horse power required to carry the full electrical load of the generator requires enough RPM's. Most one and two cylinder engines have rated horse power at 3600 RPM. Slower engine speed results in less horse power. |
|||