The difference in materials cost between a 20a and 50a outlet (receptacle) isn't necessarily much depending on the length of the run. The receptacles themselves are roughly the same cost, as well as the breaker. The real difference in price would be the wiring, which would depend on the length you need to run.
I ran 10' of 6 gauge and installed a NEMA 14-50. Total cost for breaker, wire, and receptacle was about $75.
EVSEs should come with the capability to charge at up to 32a on 240v. Manufacturers should sell adaptors that communicate with the EVSE what plug is installed, and therefore what amperage to limit to. The extra revenue from selling adapters could offset the slightly higher cost of an EVSE capable of 32a (due to the thicker wire).
Give me absolute safety, or give me death!
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