@lin11c @Gustodon the only problem is, that in temperate climate zone, you have winter. During winter, the production goes as low as 10% and only for few hours per day.

Cloudy days and nights are mostly ok during summer, when the batteries can recharge only after few hours of sunlight.

This means, that we still need some backup sources during winter. And this is the only issue, because scalable long term accumulation is still not easy.