Not quite- these motor capacitors provide a phase shift for a second set of windings. Without it, the motor will just hum and not rotate.

You are describing bulk or filter capacitors that go from supply to common on a DC circuit, parallel to the load. These motor caps are on AC and in series with the load.

Motor capacitor for an A/C compressor. A $15 part that a service company is going to charge $400 for a guy missing most of his teeth to replace in 2 minutes.

If you charge overnight, the base load is less likely to be fossil fuel. If it is fossil fuel, emission controls on a power plant are far more effective than anything with wheels.

The average car emits 400g CO2 per mile
https://www.epa.gov/greenvehicles/greenhouse-gas-emissions-typical-passenger-vehicle#driving

My power company emits 364g per kWh, which will take an EV about 3 miles. So that’s ~120g CO2 per mile, one third of a gasoline car.
https://www.climatiq.io/data/emission-factor/65ad9f91-28a1-45b2-bbab-3dcdd5de6a46

That’s the total mix- natural gas is the primary peak fuel so charging at night is likely less than 100g/mile

Have you seen how complex these things are? I think programmer socks should be a requirement.

Tax credits are always a government gift to corporations.