Re: Power required
As long as your commute is under 10 miles each way. And there is no charge leakage while you are not driving the car.
What about my old commute that was 2.5* that each way? you're now charging every third day, maybe every two, as charging only to 80% and not discharging completely is better for the battery.
There are a surprisingly large number of people in my office who commute nearly twice that. Well, that's a daily charge.
I was on a secondment for a while, a 130 mile trip each way - that'd be a charge before each journey.