In today’s episode of Poolside Chat, Rob and Matt tackle another common swimming pool question:
What’s the Difference Between a Start and Run Capacitor?
My new motor has a capacitor on the top and the back, but my old motor only had a capacitor on the back. What is the difference?
First off, the capacitor we’re referring to is the battery shaped barrel on the back or the top of the motor. The pool owner with the questions sounds like their original motor was considered a capacitor-start motor. That’s a very common standard efficiency motor. It uses a start capacitor in the back to provide extra torque when the motor turns on. The start capacitor gets taken out a circuit once the motor reaches two-thirds to three-quarters of the full speed. The new motor is a capacitor-start, capacitor-run motor. This is an increased efficiency version that has a run capacitor on top and a start capacitor on the back. The run capacitor remains in circuit at all times. Makes it a little more energy efficient.
No matter the capacitor count, it’s still going to spin your motor just as the original. Yes, it’d be the same thing but should run slightly less energy consumption.