> once per day as regular as clockwork for several hours and that means you can bridge with BESS.

If you live in Arizona or in tropical climate maybe. For anybody else it is bullshit.

Solar production fell to few percents of its peak when the sky is covered.

Many European regions can spent multiple weeks during Winter with the sky entirely covered.

BESS is nowhere near the capacity required to even go pass a single day. And it is unlikely to change even over the next 10y.

So hoping to run entirely on Solar + BESS for a multi week Dunkelflaute is living in dreamland, no reality.

What happens in practice is that country like Germany will need to have a backup Gaz that matches its peak consumption in Winter if they want to go full renewable.

The other option is to throw the problem on your neighbours with interconnects. This is what Germany does with mainly Norway, Sweden and France. And this is not a sustainable solution.