It's not fixed formula, but as per basic rule, easy method tocalculate for motor capacitor. (2650 X full load amps) divided by supply voltage(mentionedin capacitor)= MFD. (Plus or minus 10% to 15%) Ex: 1 Tr which gives full load amps of 6 amps (2650 X 6)=15900 divided by 240(VAC)volts=66.25MFD (10% to 15% plus or minus) You can fix 56.32 mfd or 76.18mfd So, you can go in between 56.32 mfd and 76.18 mfd. If you calculate of 440VAC capacitor, it will be 36 mfd. Hope, it will be helpful . Thanks.
You can use 440VAC capacitor for air conditioners working under 220 volts or 370 volts, but not conversely This is the extra information, I want to share with you. Thanks.
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I've never heard of formulas but that according to motor design, a capacitor characteristics.
Start winding, run winding, henries of winnings, voltage, current, rpm, torque, # of poles, magnetic neutral plane, all engineering factors for motor design plus who knows what else.
A motor capacitor voltage is rated for apparent voltage and not the applied voltage. I would go with motor manufacturer recommendation or trial and error, if anyone has an effective ball park range formula, my hat's off for you.
GAST R5 Regenariar Blower pump (and vacuum)
with a starting capacitor 450-540 mfd / 165 VAC
Can find exact one with 165 VAC
Wich alternative I do have, before combining two or more capacitors???
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