I did this, and I drove more than you. I used 110V for maybe 3-4 months while I was debating if I need 220V (my commute was like 20 miles a day). I ended up driving a lot more than I thought I would, so on weekdays the 120V was enough, but I'd always drive more than on the weekends, and during those months probably used a SpC once a month to top off. Overall: yes, you can do it on 120V. It's easier on 240V, but 120V is doable, and I did it for a few months.