Like all buildings should have some kind of standard for solar panel placement added or retrofitted with a very low cost modular mounted frame. Then, when you get an appliance it has a built in battery and comes paired with the right size panels that are sized for each region in the local store/wholesale distribution layer.
The whole scheme is hybrid in the first phase of a decade or so while edge cases and issues come up, like how to handle high rise buildings. Then the burden of grid infrastructure is less of a burden on the poor in total because few people are going to replace all appliances in this instance unlike those that can install a whole house solar system. The entire thing would be more incremental and serviceable over time with modularity. It is less efficient overall compared to a single controller and battery but doesn’t require large upfront cost or repurchase later down the line.
This isn’t that good of an idea. While it seems like a good idea as we skip the loss of DC solar panel to AC mains to DC appliance.
Currently each appliance* you have runs at 110/240 AC and will transform down to whatever DC voltage the device needs.
Solar panels produce DC voltage somewhere between 12v to 52v.
Plugging in a device that expects 12v into a 48v line will blow something up.
*Some appliances like washing machines, fridges, toasters, kettles don’t always use DC some will still step down the voltage to something more usable.
The power can easily be addressed in a buck boost topology and matched to the machine in question much better than a general system for the home as it would remove any need to worry about the standard voltages. Match to the appliance’s needs directly. Then use a small step down wall wart like plug pack to boost the battery as a hybrid option if needed during the down cycles.