[watwut]

They have normal grid too and also batteries exist. Also, these houses normally exist during the night and during the winter when days are short.

Overcast day zapping whole region is made up issue here.

[akoboldfrying]

All this really only shows that the single point of failure fails quite regularly, to varying degrees.

It reminds us that widespread personal solar panel deployment reduces the total amount of centrally generated energy required, but doesn't even make a dent in the max capacity, which is much more important in terms of deciding infrastructure investment.

[watwut]

You really do not know what single point of failure is ... do you?

[akoboldfrying]

It's clear from context that "failure" here means a state that is no better than if there were no solar panels at all, i.e., complete dependence on central generation.