My small car needs around 40kwh to go from empty to 80% charge...

My small car needs around 40kwh to go from empty to 80% charge (from memory) .
takes around 40 minutes to charge that amount however normally I only need a top up of around 20kwh if away .
So lets say 10 cars in one hour use 20kwh that is a 200kwh battery at a solar charge station needed and that is assuming
worst case scenario there was no sun for that one hour of charging to supplement the battery .