I’ve seen a couple of YouTube videos about them, but how they actually work, I’m not sure. Maybe not much more than an extra capacitor to get the compressor going, and maybe a timer to have the fan motor startup several seconds earlier to lower the power surge a little bit.
I suspect they use a microprocessor to track startup currents on every install and then time-slice the currents to better control the current during each cycle of the 60 Hz coming in.
It does work when it hasn’t broken internally without notice.
Scary is I would never have known if I didn’t have weekly utility failures. I would have been dead in the heat during a hurricane. Can’t trust these people anymore.
” Maybe not much more than an extra capacitor to get the compressor going, and maybe a timer to have the fan motor startup several seconds earlier to lower the power surge a little bit.”
They work by starting at a lower voltage to reduce initial current surge.