With battery storage, you have to keep a perspective on the levels of usage and the capacity of the batteries.
TLDR: have someone else check the math and teach you what it takes to meet your expectations, not the salesmen.
Just my opinion, but... Here, like too many other places in life with big ticket items, the marketing folks like to muddy up the issues. Instead of being straight and clear with folks, they tend to want to keep folks hypnotized and under their spells. Too many folks go willingly because of their environmental emotions, not because of any logical decision.
They too often find they bought into something that didn't meet their expectations, and if/when they complain, the salesmen point out the fine print and it is their tough luck.
The size of a solar array to meet your needs is something that should be researched prior to contacting sales folks. The same goes for the size of a home energy storage system, generator, fuel tank, etc..
Things like home heating and air-conditioning are not commonly understood either, but they have also been an evolution through many years worth of committees (and law suits). ASHRAE has existed since 1894, yet folks still end up with the wrong heaters and air-conditioners too often because they listened to unqualified salesmen.
It will be a very long time before regular folks learn the scales of solar or home energy storage, but only because that industry is exploiting current politics to make quick sales at the taxpayer's/consumer's expense. Eventually, that knowledge will be spread around and there will be more sanity in that market.
Buyer beware applies in bold print when it comes to things like home solar, home energy storage, etc.. Batteries have come a long way in the last 25 years, but they still have limits and so do the electronic controls we use to convert the stored energy into something useful.
If someone tries to sell you home solar or storage, and tells you it can charge your BEV, have someone else independently check their math. Caveat Emptor