Napkin maths would suggest something like 20% of a normal EV battery per household, so indeed a big investment, but perfectly reasonable. The harder part is tha

Napkin maths would suggest something like 20% of a normal EV battery per household, so indeed a big investment, but perfectly reasonable. The harder part is that solar power production is much lower in the winter (depending on latitude), and seasonal battery storage is still a bit out of reach.