Most people think that a DC grid is unconceivable because it cant be switched or would be unsafe or inefficient.
The truth is that Most appliances already work on DC. They all convert the AC internally to DC with inefficient PFC circuits. When you supply DC directly you can omit these stages and reduce component count, increase overall efficiency and increase lifetime.
DC requires another mindset and cant be approached or handled like AC (mechanically switched etc.), but with electronics it can be made much safer than AC. In this video we demonstrate the difference between an AC circuit breaker and an intelligent DC breaker. The results speak for themselves.
The same goes for earth leak detection, AC 30mA (shutdown 300ms) vs DC 1mA (~1us).
The following tests are demonstrated: