Solarpunk

So the big thing with the balcony solar to me is it can be plugged into a standard outlet and it would work without sending electricity downstream to the system somehow. So it seemed to be smart like that. Let me know if I have a misunderstanding here. So I always felt like having batteries would be useful enough without solar as you could (at least in my area) take the hourly electric rate and charge it during non peak times and have it be used during peak hours. This in addition to getting through power outages. So im kinda wondering if there are balcony battery options that would allow for this. Plug it into an outlet and setup when not to charge and when to provide power. Anyone know if this is a thing?