In Europe it's somewhat common to have a small solar panel just on your balcony (i.e. not permanent attached to the building) and simply plugs into a nearby wall receptacle. https://www.theverge.com/24150901/ecoflow-powerstream-review...
For those wondering, the article did discuss the safety matter of using a power outlet as an inlet. And the article also points out that while this is allowed in several countries in Europe it's not allowed in the U.S., but I suppose you could always plug appliances directly into the battery instead.
Wild. I wonder how they deal with the back feeding issue. Is there something about the home wiring in those countries that prevents it? (or do they just not care and line workers know to check if a line is truly dead?)
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We are starting to have this in the US, in fact I have a company coming by to do an install of a system like this on Monday. Technically you should be able to mostly diy it, but it uses a smart panel that gets attached to the main to prevent backflow, which needs an electrician, and for now they are running its own circuit.