The All-New Aussie Made Thunderbird S21B is a 2 km solar-powered electric fence energiser designed for small fencing applications, including strip grazing, overnight yards, and temporary fences. Its portable design makes it perfect for use with small to medium animals such as dogs, horses, cattle, poultry, and many small feral species. Built tough for Australian conditions, the S21B delivers reliable, efficient solar power and easy setup wherever you need it.
- Australian Made – proudly designed and built in Australia to handle tough local farming conditions.
- 3-Year Manufacturer’s Warranty – backed by Thunderbird’s reliable support for peace of mind.
- Best-Selling Solar Electric Fence Energiser – trusted by Australian farmers for performance and durability.
- High and Low Power Settings – adjustable output to suit different fence lengths and livestock requirements.
- Magnetic Switch Design – improves water resistance and reliability with no holes through the casing.
- Low Battery Indicator Light – easily monitor power levels and recharge before the battery runs low.
- Pulse Fence Light – confirms the energiser is operating correctly at a glance.
- Vacuum-Sealed Transformer – ensures long-term reliability and stable output in all weather conditions.
- Encapsulated Electronics – sealed internal components protect against dust, moisture, and insect damage.
- Rechargeable Internal Lithium Battery – delivers consistent power with efficient solar charging and long life.
- Includes Earth and Fence Leads – fitted with insulated alligator clips for quick and secure setup.
- Durable ABS Enclosure – tough, weather-resistant housing designed for maximum solar collection and impact resistance.
- High-Quality Crystalline Solar Panel – ensures efficient charging and dependable daily operation.
- Smart Software Technology – monitors solar input and adjusts charging to extend battery performance.
- Ideal for Small Fencing Applications – perfect for strip grazing, temporary paddocks, and small farm setups.
- Fully Portable Design – features a built-in carry handle and battery for easy transport and setup anywhere.
- O-Ring Sealed Case – provides superior protection from dust and water ingress.
- Mounts Easily to Star Pickets – slides directly onto steel posts for quick installation in the field.
- Perfect for Strip and Cell Grazing – great for rotational grazing systems and secure overnight yards.
- Lightweight and Versatile – compact design makes it easy to move between paddocks as needed.
Thunderbird S21B Energiser Model Specifications:
- Joules: 0.15
- *Distance: 2km
- Output: 7.7 kV
- Output @ 1000 ohms: 2.3 kV
- Replaces old Thunderbird models Solar-2, S18B and S19B
What’s in the Box:
- 1 x Thunderbird 2km Solar Electric Fence Energiser
- 1 x Alligator Clip Earth Lead
- 1 x Alligator Clip Fence Lead
- 1 x Electric Fence Instruction and Product Manual
Please have a look at the Thunderbird Model Comparison Charts or contact us to select the correct model to suit your needs.
*Energiser distances are a guide only. Factors such as proximity of live wire(s) to earth or to other parts of a fence, distance of live wire run underground, thickness of wire and earth condition will affect the effective distance. Thunderbird recommend a minimum distance of 200mm between the live wire(s) and any other conductor, otherwise effective energiser distance is reduced.
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