What size start capacitor should I buy for my refrigerator compressor?
What is the PTC?    For the horsepower, you need to add in the power factor which is somewhere around 75% and use the input watts of +/- 1000 not the 745.7 figure you used. Is the compressor a psc which uses a capacitor all the time. What is a Supco 3 in 1 start capacitor? You have a lot of variables you need to consider. If you are not exactly sure what you are doing call a service tech or continue to play " Russian roulette"