What size AC capacitor do I need? Multiply the full load amps by 2,650. Divide this number by the supply voltage. The full load amps and the supply voltage can be found in the owner’s manual. The resulting number is the MicroFarad of the capacitor you need.
What happens if you use the wrong size capacitor? This is why oversizing a capacitor can quickly cause damage to a compressor. By increasing the current on the start winding the compressor start winding will be much more prone to early failure.
Is it better to use a bigger or smaller capacitor? All capacitors are not equal in their performance. Using a bigger cap is not always the best answer. Ideally, the capacitor should be sized for the amount of charge needed to supply transient current to the circuit for which the capacitor is filtering or decoupling.
Can I use any capacitor for my AC unit? No. Start capacitors and run capacitors have too many differences to be interchangeable. Using a start capacitor in place of a run capacitor would short out your AC system and would likely lead to the fan motor and/or compressor malfunctioning.
- What size AC capacitor do I need? – Additional Questions
- Can I use a 7.5 capacitor in place of a 5?
- Can I replace a capacitor with a higher UF?
- Are AC capacitors universal?
- Are all AC capacitors the same?
- How do I know which capacitor to use?
- How do you match an AC capacitor?
- Does a capacitor have to match exactly?
- Does physical size of capacitor matter?
- How often should you replace AC capacitor?
- What happens if you put the wrong capacitor in an AC unit?
- Can I replace my own AC capacitor?