Gallagher S120 Lithium Solar Fence Energizer | 1.2J | 35 Miles | G352404

The Gallagher S120 Lithium Solar Fence Energizer (G352404) is Gallagher's most powerful lithium-powered solar energizer, delivering 1.2 joules of adaptive stored energy with coverage of up to 35 miles (56 km). It combines a built-in high-efficiency solar panel with a lithium battery for superior off-grid performance — including reliable operation in cold weather and low-light conditions where standard lead-acid solar energizers underperform.

What is the Gallagher S120 Lithium Solar Energizer?

The Gallagher S120 is a self-contained solar fence energizer manufactured by Gallagher, New Zealand — the world's leading electric fence brand. The S120 is the top model in Gallagher's S-series lithium solar energizer range. It uses adaptive energy control technology to automatically adjust output based on available sunlight and battery charge level, maximizing fence performance at all times without manual adjustment. The integrated lithium battery provides significantly better cold-weather performance and longer cycle life than lead-acid alternatives.

Key Features

• 1.2 joule adaptive stored energy – Industry-leading output for a solar energizer; powers long fence runs and handles heavy vegetation contact
• 35-mile (56 km) coverage – Suitable for large paddocks, remote boundaries, and multi-strand livestock fence systems
• Adaptive energy control – Automatically adjusts output based on solar input and battery charge for optimized efficiency
• Lithium battery technology – Superior cold-weather performance, longer cycle life, and lighter weight vs lead-acid solar energizers
• Built-in high-efficiency solar panel – Integrated panel continuously charges the lithium battery during daylight hours
• Lightweight and portable – Designed for rotational grazing; easy to move between paddocks without tools
• UV-stabilized housing – Weather-resistant construction for year-round outdoor use in all climates

What is the Gallagher S120 used for?

The S120 is designed for off-grid electric fencing applications where mains power is unavailable or impractical. Common uses include:

• Rotational and managed grazing – Move the energizer between paddocks as part of a strip or cell grazing system
• Remote boundary fencing – Power fence lines in distant paddocks without running power cables
• Livestock containment – Cattle, sheep, horses, goats, and pigs across large or irregular properties
• Wildlife exclusion fencing – Deer, predator, and pest exclusion on rural and conservation properties
• Temporary and seasonal fencing – Portable setup for seasonal grazing areas or event enclosures
• Off-grid and backcountry applications – Any location where solar is the only viable power source

What is the difference between lithium and lead-acid solar energizers?

Lithium solar energizers like the Gallagher S120 offer several advantages over standard lead-acid solar energizers:

• Cold-weather performance – Lithium batteries maintain capacity at low temperatures; lead-acid batteries lose significant capacity below freezing, which is critical for Canadian winters
• Longer cycle life – Lithium batteries typically last 3–5x longer than lead-acid before replacement is needed
• Lighter weight – Lithium units are significantly lighter, making them easier to move between paddocks
• Faster recharge – Lithium batteries accept charge more efficiently from the solar panel, recovering faster after cloudy periods
• No maintenance – Lithium batteries require no water topping or equalization charging

How does Gallagher Adaptive Energy Control work?

Gallagher's Adaptive Energy Control is an intelligent power management system built into the S120. It continuously monitors available solar input and battery charge level, then automatically adjusts the energizer's output pulse to match available power. In full sun with a charged battery, it delivers maximum output. During extended cloudy periods or low battery conditions, it reduces output to extend battery life and keep the fence operational rather than shutting down entirely. This eliminates the need for manual output adjustment and ensures the fence stays powered through variable weather conditions.

How does the Gallagher S120 compare to other S-series models?

The S120 is the highest-output model in Gallagher's lithium solar S-series range. Lower-output models such as the S10, S20, S40, and S100 cover shorter fence runs and suit smaller properties or fewer livestock. The S120's 1.2-joule output and 35-mile coverage make it the right choice for large farms, extensive boundary fencing, or operations with heavy vegetation on the fence line that requires higher voltage to maintain effective containment.

Specifications

• Model: Gallagher S120 Lithium
• Part number: G352404
• Stored energy: 1.2 joules (adaptive)
• Coverage: Up to 35 miles / 56 km
• Power source: Built-in solar panel + lithium battery
• Energy management: Adaptive Energy Control (automatic)
• Battery type: Lithium
• Cold-weather rated: Yes
• Housing: UV-stabilized, weather-resistant
• Mounting: Portable; post or fence-mountable
• Country of origin: New Zealand
• Manufacturer: Gallagher
• SKU: FENELEG352404

What's Included

• Gallagher S120 Lithium Solar Energizer unit with integrated solar panel
• Lithium battery (built-in)
• Fence and ground lead cables
• Mounting hardware

Note: No mains power connection required. Compatible with all standard electric fence wire, poly braid, and tape.