I’ve got a small 3kw solar system with about 9kwh of battery storage and that manages about 90% of our yearly charging. Otherwise in nz I pay about 10(US) cents per kWh from 11pm-7am (about 20 cents in daytime) for my charging at home. Public chargers are generally around 40 cents /kWh but range from 50-200kw so can dump power in pretty fast (although my car maxes out at 50kw for charging).