You can buy products kinda like this already. Portable solar panels, portable all-in-one charger/battery/inverter, charging from the grid if you want, and basic

You can buy products kinda like this already. Portable solar panels, portable all-in-one charger/battery/inverter, charging from the grid if you want, and basically available off-the-shelf. They're sold for camping, RVs, boats etc. No ability to feed power back into the grid though.