Another component that I am seeing electric vehicle owners buying are hard start kits for their AC units. This is basically another capacitor that is wired in series with the existing capacitor to help it start up quicker. This basically buffers the battery from the initial power spike at start up. A simple strategy would be to have some solar panels on the back hatch keep the cars capacitor banks topped off and trickle charge any excess to the lithium bank.
Here is a link where you can purchase them on Amazon =
Compressor Saver CSR U1 Hard Start Capacitor - Hvac Controls - Amazon.com