What happens if start capacitor is too big?
Much the same way, a motor will not run properly with a weak capacitor. This is not to imply bigger is better, because a capacitor that is too large can cause energy consumption to rise. In both instances, be it too large or too small, the life of the motor will be shortened due to overheated motor windings.
Does start capacitor size matter?
Sometimes (or even usually) there is no real difference, so you can choose depending on the size itself: if you solder by hand, bigger size can be an advantage. Voltage ratings, ESR/Q value, aging, temperature stability, price, packaging convenience for automated pick & place, etc.
What happens if capacitor is too small?
Too small a capacitance and there will be insufficient current it the associated winding. In the limit, this will approach an open circuit where the capacitor should be. The motor will just hum but not spin. Too large a capacitance will go the other way and in the limit will be like the capacitor is short circuit.
What causes a start capacitor to fail?
Overheating is a primary cause of a failed start capacitor. Start capacitors are not designed to dissipate the heat associated with continuous operation; they are designed to stay in the circuit only momentarily while the motor is starting. If a start capacitor stays in the circuit too long, it will overheat and fail.
Is it OK to use a different size capacitor?
Larger than needed microfarad values will not cause much of any problems (especially for a start capacitor). A larger than needed run capacitor will not have any real affect. Depending on the cap and motor it could improve efficiency or decease efficiency very slightly.
How long do start capacitors last?
approximately 20 years
Age. Like all things, capacitors have a limited life span. Most are designed to last approximately 20 years, but a number of factors can cause them to wear out more quickly.
Can I use a 440v capacitor instead of a 370v?
The voltage rating displays the “not to exceed” rating, which means you can replace a 370v with a 440v but you cannot replace a 440v with a 370v. This misconception is so common that many capacitor manufactures began stamping 440v capacitors with 370/440v just to eliminate confusion.