Description

Thunderbird S21B Lithium Solar Fence Energiser

The Thunderbird S21B is a compact, self-contained solar electric fence energiser designed for short fence runs and portable livestock-control applications. With 0.21 joules of stored energy, it can power up to 2km of clean fencing under ideal conditions.

An internal lithium iron phosphate battery stores energy collected by the integrated solar panel. The complete unit slides directly over a standard steel post, making it quick to install and easy to move between paddocks.

Why Choose the Thunderbird S21B?

• Powers up to 2km of clean fence under ideal conditions
• 0.21 joules of stored energy
• Internal lithium iron phosphate battery
• Integrated solar panel
• Up to 9.0kV no-load voltage
• Slides directly over a standard steel post
• Compact and portable design
• Magnetic switch eliminates unnecessary holes through the casing
• O-ring-sealed enclosure
• Coated electronics provide additional environmental protection
• Australian made

Internal Lithium Battery

The S21B uses an internal lithium iron phosphate battery to store solar energy. Lithium battery technology provides a compact, lightweight power source with a long service life when the energiser is correctly positioned, operated and maintained.

The integrated solar panel automatically charges the battery during daylight. Position the panel facing north in an open location where it will receive direct sunlight throughout the day.

Quick Portable Installation

The moulded enclosure is designed to slide directly over a standard steel star post. This allows the energiser to be installed quickly without constructing a separate mounting frame.

Its self-contained design makes the S21B particularly useful for strip grazing, temporary paddock divisions, garden protection and other short portable electric fences.

Designed for Australian Conditions

The tough moulded casing, O-ring seal and magnetic switch help limit potential entry points for water. Internal electronic components are coated to provide additional protection against moisture and environmental exposure.

The energiser should still be installed according to Thunderbird’s instructions. Keep the solar panel clean and unobstructed, and avoid positioning the unit where buildings, trees or equipment will shade it during the day.

Understanding the Fence Distance Rating

The advertised 2km distance represents a clean fence operating under ideal conditions. Vegetation touching the live wires, poor connections, damaged insulators and inadequate earthing can substantially reduce its effective working distance.

The S21B is intended for light-duty, short fencing applications. Choose a larger solar energiser for multiwire fences, electric netting, heavy vegetation or longer livestock-control systems.

Product Specifications

• Brand: Thunderbird
• Model: S21B
• Product SKU: SOLAR2
• Maximum fence distance: Up to 2km under ideal conditions
• Stored energy: 0.21 joules
• No-load voltage: Up to 9.0kV
• Voltage at 1000 ohms: Approximately 2.6kV
• Power source: Integrated solar panel
• Battery: Internal lithium iron phosphate battery
• Mounting: Slides over a standard steel post
• Switch type: Magnetic
• Enclosure: O-ring sealed
• Warranty: Two-year Thunderbird manufacturer warranty
• Country of manufacture: Australia

Is the Thunderbird S21B Right for Your Fence?

The S21B is a practical choice for short, clean electric fences where mains electricity is unavailable. It is well suited to strip grazing, temporary livestock control and small property applications requiring a portable self-contained unit.

For fences exposed to heavy vegetation, multiple live wires or future expansion, select a larger solar energiser with additional stored energy and battery capacity.

Correct earthing is essential. Contact Horsley Wholesale if you need help choosing a solar energiser, portable earth stake or temporary fencing equipment.

Browse our solar electric fence energisers for other off-grid fencing options.

Additional information