A battery cabinet is a device designed to contain batteries used to power an Uninterruptible Power Supply (UPS) system. In the event of a power outage, the UPS system ensures that your devices continue to operate thanks to the energy stored in the batteries in the battery cabinet.
The answer to what solar panels are made of is simple: they're primarily built from silicon solar cells, a protective glass layer, an aluminum frame, wiring, and encapsulation materials.