Constantly charges repeller's battery. Solar Power Panels convert sunlight into electricity. Wire sequentially conducts the electricity to batteries where it is stored until needed. Electricity is then used directly from batteries, to power DC (direct current) appliances like your repeller from Bird-X. Solar Power Panel, Note: You must purchase a 12-Volt DC battery in order to utilize the Solar Panel. The panel can only charge the battery: it cannot power the repeller directly. A deep cycle, marine type battery is recommended. Bird-X does not supply batteries.