Over here in the UK there is also talk of relying on the Li-Ion batteries in electric cars as the preferred storage method for the renewables rather than having a separate battery (the grid would have to be synchronised for the commutes, but is perfectly doable).
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As an ex-pv installer i believe more in stand alone systems than any other type of installation. The more reliable the batteries the more durable power supply with less cost over the years.
Would you happen to know the expected payoff for a standalone battery system, by chance? I don't doubt that car batteries would probably be more expensive, but they may perhaps be easier to get people to purchase.
On a related note, Tesla is also investing in constructing utility scale battery banks for solar PV installations to help with demand side management (the same is being applied for wind power within the UK). You may be interested in this short article describing such a system in Australia: https://www.bbc.com/news/world-australia-42190358
We have to know the cost of power in every country . Also we have to know the installed power and the power of sun at the exact spot. It is totally different if we install a stand alone system in UK than a stand alone system in Greece.By the way very interesting article .