Because of math.
A 6 kW house, to charge a 60 kW battery… so long as everyone with an electric vehicle is charging them at their house for 10 sunny hours to charge from empty, you’re right and I’m wrong.
Some people could get by, but it leaves the solar for nothing else. If you leave the house while the sun is up you better get back because you’re losing daylight!
The average is 8900 miles per year which is a little under 24 miles per day and a little under 750 miles a month.
If you can charge with solar at 6 kW on a typical EV that will give you about 20 miles per hour of charging. If you can do a little over an hour a day you will be covered.
If you find plugging in for an hour a day to much of a hassle it is under 9 hours a week or 37 hours a month.
Good to know how wrong I am on this topic. Let me guess, you own an EV? Well, that certain explains it everything.
You made some basic mistakes in your previous reply, such as confusing power (kW) and energy (kWh) and assuming that a typical driver in HI commutes something like 250mi each day. This isn't even typical for drivers on the mainland, where plenty of EV+solar owners manage to replenish most or all of their EV usage using rooftop solar generation just fine.
(If you're going to answer "well, I never said I was considering the median distance/day case - I was talking about the most extreme scenarios!" then I'd suggest at least bumping up the hypothetical solar installation to 10kW instead of going with the median.)