@hendrik Aliexpress will have every kind of DC wiring accessory you need for the consumption side, DC-DC converters ( up for battery and laptop charging , and down for USB ) plug and socket adapters.

12v fridges and TVs are a thing now. Most micro form factor PCs have 12 or 19v DC inputs. You can evennrun starlink from DC. 12 Dc Water pumps are cheap even selling small 12/24v Aircon and washing machines. Only thing that really doesnt work is cooking (gas bottle is best)