48 volt systems are better because of 3 main reasons. 1) The wattage a single inverter, charge controller, charger and converter can output is 4 times as much as 12v systems for close to the same price for each device. 2) Wire gauge needed to run the same distance is 4 times less than 12v wiring. 3) Overall efficiency of 48v devices and the overall system as a whole is usually a couple percent higher than 12v.
Companies are finally producing 48v appliances: 48v Refrigerators, 48v RV Roof Vent Fans, 48v Water Pumps, 48v Air Conditioners, 48v Chargers, 48v Converters, 48v Inverters, 48v Electric Stove Tops, 48v Microwaves.
RV, Camper, Van Conversion, Tiny Homes, & Off Grid Systems have not used 48v until now because there were no major appliances that ran directly off of 48v. It was either 12v DC or 120v AC. THIS HAS CHANGED!