Solar+battery isn't sufficient in all places indeed. But those places are usually great for wind. With solar+battery+wind+other renewables+grid, the solution be

Solar+battery isn't sufficient in all places indeed. But those places are usually great for wind. With solar+battery+wind+other renewables+grid, the solution becomes rather easy. Toss in some gas until the battery capacities have grown enough. But nuclear is the worst thing to put into this mix due to its nature.