Capacitor Size Decision

This depends on the type of motor....generally speaking 5ufx370v for 1/4 hp...7.5ufx370v for 1/3 hp....10ufx440v for 1/2 hp...You can also call the manufacturer or the distributor, if you have the model# ...You can usually tell if the capacitor is properly sized by checking the amp draw under load, it should be roughly 3/4 of the rated max...You can also check operating temperature after the motor has run under load for say 20 min or so...Rule of thumb, if it's too hot to hold your hand on, then you got a problem, either the bearing is bad, the cap is too small, or bad, or a winding is shorted....A start capacitor is usually sized according to the start winding configuration, but they do make generic start kits, usually 105-220uf give or take...hope this helps....

SolarEagle

Thank you for this information.

Do you ever come accross any TABLE showing:

hp/kw--TO--microfarads?