I have a 1/2 HP pump motor (dayton, capacitor start) that I would like to
add a run capacitor to. The motor is drawing about 105% of its FLA but below
its SFA. I am hoping that a run cap would make it last longer and improve
its efficiency. I am it the process of building up a thermostat control box
for it that should have enough room to add a capacitor. My problem is that I
don't know what size of run cap. I have seen rules like 10 MFD/HP to 15 MFD
used in 1/2 HP well pumps. Any idea as to a good size to try ? Is too small
OK but not optimum ? Too big I know could over heat the start windings.

Thanks

Dave