"so I don’t see how Australia will cope with 10 million car batteries charging every night . Let alone how much the power bill will go up . Nuclear is the only option or hydrogen combustion / lithium"
You worry too much. It will take a while before Australia will have 10 million car batteries. By that time, virtually everyone will have solar and power storage. Besides, if mine is a typical family, annually, car#1 does only 15,000km, car#2 does only 6,000 km, so assuming a range of 350km, we'd only recharge them the equivalent of 43x and 17x respectively.
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