High-efficiency solar panels mounted on or around the container capture solar radiation. What are self-contained solar energy containers? From portable units to large-scale structures, these self-contained systems offer customizable solutions for generating and storing solar power. In this guide, we"ll explore the components, working principle,. Ready to select a solar container that can actually perform under pressure? Learn. At its core, the solar energy container operates by converting sunlight into electricity using photovoltaic (PV) panels mounted on the roof or deployed nearby.