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The S20 Lithium Solar Fence Energizer from Gallagher is a compact, portable, fast-charging, and long-lasting solar fence charger that’s designed to put more power in your hands. An internal lithium iron phosphate battery and high-efficiency 3W solar panel provide superior and continuous, long-lasting power on your fence line, day and night. The S20 Lithium provides intelligent energy control: smart, adaptive electronics are constantly monitoring the solar energy being stored, measuring it against the battery voltage and then adjusting output energy to ensure your fence is powered for as long as possible—even in the absence of sunlight. Robust construction features a dual-insulated plastic enclosure which protects internal circuitry and lithium batteries from extreme temperatures, providing unparalleled performance and reliability. LED lights indicate when the fence voltage is too low for stock containment or if the built-in lithium battery is running low. The S20 Lithium's water-resistant case, with built-in lightning protection, keeps stock contained in all weather conditions. Simply mount on a suitable post and connect it to your fence and ground rod. Includes fence- and ground-lead, rechargeable lithium battery, and integrated solar panel. Maximum output voltage: 9.3kV. Energy: 0.2 Joules stored; 0.15 Joules output. Powers up to 2 miles of typical fence or 12 miles of clean fence and up to 40 acres. Gallagher provides a 3-year warranty.