When I said break even, I meant financial feasibility. Point is you can invest in solar power plus 12h of storage and this makes financial sense.

As for winter periods, noone expect solar to magically work in winter. Point is to reduce dependency on fossil and this can be achieved. You’d still expect strategic energy reserves and winter power to be delivered through fossil, due to avaliabliy and good energy density.

You could substitute fossil with wind power during winter, but that still requires storage.