First, 240 volts is now the grid standard for home wiring, along with 120 volts.
Second, you need to find out how many amps your existing charger can use. If it is already "maxed out" then there is not a lot of point in upgrading the wiring unless you also buy a new charging station. (The actual charger is in the car.)
Third, while a higher output charging station will charge the ePlus faster (as long as your old station isn't already giving the car all the amperage it can handle), do you need faster charging? If you have, say, a 24 amp charging station, you can only go up to 27.5 amps charging rate anyway - that's the maximum the car can use.
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
BAFX OBDII Dongle
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.