Only issue with using car battery is that with every full discharge it would loose a bit of a capacity. If system can run with 50% discharge of batteries car batteries should last about 1.5 years with 80% remaining (1 charge per day).
So for anyone looking for a short term solution car...
I think they just made so many of those policy errors. Starting with the carbonic fertilizer issue. Personal opinion is that these guys has no practical knowledge on how to handle a country.