I had a similar setup and upgrade done last month. I have a Clipper Creek 40 on a 6-50 outlet, 50AMPS breaker. I decided to upgrade to a Tesla wall charger, so I called my Solar installer, that also does electrical work. The salesperson said I could upgrade the breaker to 60AMPS without any issue since they are familiar with existing wiring, but the electrician called first before coming over, saying I will require to upgrade the wire (it's 6AWG inside/no conduit, probably around 25 feet away from the breaker). I don't want to spend that extra money and stay with the 50AMPS breaker and hard wire to the waller charger.