See: https://www.bbc.com/news/business-63029226
$1000AU worth of panels, a $200 charge and a $1500 battery will give you 30km or so a day.
Pays off in about 4 years vs $1.80/L even with very optimistic fuel economy. if you park at home then the price halves.
If you can put the panels where you park that goes down to 1-2 years.
See: https://www.bbc.com/news/business-63029226