Keep DC on DC side. Balance AC with simple means and without network. As much as possible. Keep the Basics basic.

C: plugbox - dc power hub on lowest tech with longest life and safest voltage.

A: smartmat in remote application - most common use will be batterypack single fault safety to go (i>, i>>, u>>, u<<)

B: something like a varistor for power surge when frequency goes up: just heating up e.g. water until regular grid operation done (5-30s)

The Idea is: DC-Source plus DC-Store demands primarily for DC-Consumption (DC-COMB). Most direct, most simple and most longlived solution. That is plain thinking. Saves lot of costs especially below 6kW. Triples lifetime of electronic because DC COMB can be so lowtech that it is close to house installation, which in comparision to smarttech is like really longlived. The key point is: if you just want to replace coal you need 10TW Solar installation (~90% of world energy consumption are still oil, gas, coal -> wikipedia). You cannot do that with shortlived smarttech. It's the plugins that are the fun and the smart. The basics have to be: just there. Solid and humbly running in the background.

Inverters are ever more highly sophisticated tools to connect powers that are in disharmony. Like a lawyer or mediator. That's great for special applications or in a phase of transistion - but not as standard setup in a terrawatt scale project.

PV and Battery are not in disharmony: that is the 50-60Volt DC-COMB (honeycomb). Some 3 to 5 kWatt are generally good enough for a family home (low voltage sufficient). Portable AC-Batterypacks like Instagrid (https://instagrid.co/). The point is: the electronic (inverter) of such a unit is not 24/7 running and has potential to live much longer. Or just use portable DC-Batterypacks both for ride and domestic use e.g. power applications and to simplify installation wiring.

This at least is true for up to 60% of the World.  *  And it keeps in mind that most widespread mobility is lightweight: bike and scooter with 5-6 billion units. Only 1 billion people have cars. And 1 billion people do not even have bicycles. That's underrepresented in usual every day mind - and in usual future-tech-developments, advertisement and think tank scenarios.

Small Plants add rather lot of individual cost with planning and installation (Super Mario). You can compensate that with puristic simple style and longlife systems saving much costs in electronic (KiCad) and Smart (Apple). In this you have to put lifetime into calculation and the whole process of recycling and delivery of new electronic and smart. PV and BAT are needed in both setups.