Can I replace a 30A breaker in my panel with a 50A breaker (and new wiring)?
This is a DIY project we see a lot here. Yes, it's OK to remove your 30 Amp breaker and replace it with a 50 provided that's what your EV charger is calling for. Same for the wiring, what's called for in the installation manual. As far as the wires that used to go to the 30 Amp breaker, cut the tips off (Harper cringing), cap with a small wire nut, fold and tape them together and tuck them into the side of your panel. It's always nice to leave a note saying what the wires were for for a future homeowner or to just refresh your memory. Post a picture of your panel so if anything jumps out at us, we can further comment.