There is a lot of people who commute each day. North south and...

There is a lot of people who commute each day.
North south and west of Sydney is probably the longest, (at most 150k) so all within range.
A lot of these cars sit in the sun all day fading, for 8 or nine hours.
You would think a small solar charging device would come close to topping up the battery in that time, therefore negating the recharge each night.
As solar charging evolves, could self sufficiency be achievable?