How does a portable solar container battery output 220v voltage

Small solar panels (integrated or connected) capture solar energy and convert it into electricity through the photovoltaic effect. This electricity is then stored in the portable solar battery —most often lithium-based— offering high energy density and greater durability. The systems are expanding in application where diesel delivery is not feasible, and grid access does not exist. These devices store electrical energy from small solar panels —either built-in or external. Depending on the model, it can be charged via solar panels, wind generators, a 120-volt household plug or a 12-volt car outlet. Solar power containers combine solar photovoltaic (PV) systems, battery storage, inverters, and auxiliary components into a self-contained shipping container.