Getting you through the day is not really the point though.

The point is

1) shifting some consumption during peak hours off of peak rates

and

2) having backup to get you through a limited outage, not necessarily at your full normal consumption level but without having to be in the dark / without internet / without phone and possibly car charging.

Nobody should evaluate this by whether one battery pack by itself provides all the energy anyone needs for everything with no limits. It’s one component with several good use cases.

I’m not sure about regulations in the US but in The Netherlands you cannot just attach a battery and think you are independent of the grid. To protect the net and people working on the net, power sources behind the meter must disengage when the net/mains power drops. This effectively disables your independence plan. If you want to be independent you have to get some expensive mechanism installed that will decouple your house from the net in case of net failure and bring it back when the mains is up again. And you need get it certified periodically.

So unless you have enough generation to completely decouple from the net you are not really independent or it will cost you.

Transfer switches are standard for pretty much any generator setup. An automatic one is a bit more expensive, but hardly a deal breaker.

Okay. Perhaps I used the wrong sources when I researched what it would take to be able to handle outages. The costs for the installation and periodic “transfer switch” were significant, moreover because doing it as a private individual instead of a company was hard to arrange.

This is correct in the US as well, except that I'm not sure about the periodic certification thing.

I agree with what you said but it seems you may have meant to reply to a different comment. Independence is another topic, certainly related somewhat, although it didn’t come up in my comment... interesting nonetheless.

Actually I did. I interpreted the limited outage from point 2 as the supplier not being delivering power for a short period. If that were to happen in a normal situation here the regulation says your sources have to cut off as well. Unless you install some additional gear.

So without additional Equipment just having solar and a power wall wouldn’t help during outages.

Nighttime is another situation in which the supplier does not deliver power, at least for solar.

Yes you need cords, appliances, and other equipment, including extra equipment if you are not connected to the grid, that is a given.