This Patriot fence charger powers up to 40 miles (140 acres) of live wire. Suited to use in strip grazing or protecting remote areas where regular access is inconvenient. The SG1000 can help protect erosion areas from further stock damage or prevent livestock from damaging young trees or riverbanks. It has a 9.6W solar panel and 12v battery included. This unit can operate up to 21 days without sunlight. Three year warranty applies. Up to 1 joules maximum energy output, 1.3 joules stored output.