[nostrademons]

The seasonal problem is all about transmission lines and counterseasonal generation sources like (pumped?) hydro. There's no way you can store up a winter's worth of energy needs in batteries. Energy storage is the integral over time of power consumption, so time-shifting demand from January to July is about 750x more expensive than time-shifting it from 6 PM to noon.

Instead, we need to rely on the fact that it's not winter everywhere, at least to the same degree. My house has a similar seasonal profile to yours, but an industrial plant in the Mojave desert does not get shaded by hillsides, does not have atmospheric rivers come in, can move the panels to follow the sun's angle, is at a far more southern latitude, etc. And several generation technologies like hydro and wind actually produce more in the winter than the summer, because rainy and windy days benefit them.

This is probably the biggest argument I've seen for the continued existence of the grid. My home can run indefinitely on self-supplied energy during the summer, but I still need the grid to get through the winter.