Can I still use the upgraded unit on a standard 110/120 volt outlet?
Just be sure to purchase the optional 120 volt plug adapter at checkout then you will still be able to plug it into any standard 120 volt outlet. The EVSE will automatically configure its internal power supply for that voltage. The upgraded EVSE is "universal" and will work on almost any outlet and power system anywhere on the planet, only needing a simple plug adapter. Note that it is not possible to experience a fast level 2 charge using a 120 volt outlet. You must use a higher voltage outlet (208-240 volts)