Thunderbird S90B 10km Solar Electric Fence Energiser
The Thunderbird S90B is a fully self-contained solar electric fence energiser designed for portable, temporary and permanent electric fencing. With a built-in rechargeable battery and solar panel, it provides a convenient fencing solution where mains power is unavailable or where the energiser needs to be moved between paddocks.
Rated for up to 10km of electric fence in suitable conditions, the S90B is well suited to livestock management, strip grazing and smaller farm fencing systems. Actual fence distance will depend on fence construction, vegetation, earthing and other factors affecting fence load.
Why Use the Thunderbird S90B?
The S90B is designed to make solar electric fencing simple to install and easy to move. The energiser slides directly onto a standard steel star picket, while the moulded carry handle makes it convenient to transport around the property.
With the solar panel and internal battery built into the unit, there is no need to install a separate solar panel and battery for a standard setup. A mains charger is also supplied for recharging during extended periods of poor weather.
Ideal For
- Temporary electric fencing
- Permanent electric fencing
- Strip grazing
- Rotational grazing
- Electric fence netting systems
- Horse paddocks
- Cattle, sheep, goats and other livestock fencing
- Portable electric fence systems
- Farms and rural properties without convenient mains power
- Electric fencing that needs to be moved between paddocks
Easy Solar Electric Fence Setup
The S90B is designed for quick installation. Simply mount the energiser onto a suitable steel star picket, connect the fence and earth leads and switch the unit on.
The large LCD display makes it easy to check the energiser output, while the large fence connection knobs provide straightforward access when connecting your electric fence system.
Built-In Battery and Solar Power
The integrated solar panel charges the internal battery during daylight, allowing the energiser to continue operating after dark. A low battery warning helps indicate when the battery requires additional charging, while the supplied mains recharger provides a convenient backup during periods of poor solar conditions.
The S90B also has high and low power settings, allowing you to conserve battery power when a lower output is suitable for the fence application.
Portable and Easy to Move
For farmers who regularly change grazing areas or temporary fence layouts, portability is a major advantage of the S90B. The built-in carry handle and star picket mounting design make it easy to relocate the energiser as your fencing requirements change.
This makes it particularly useful for strip grazing and rotational grazing, where electric fence lines and paddocks are frequently moved.
Weather-Resistant Design
The S90B features an O-ring sealed case, coated electronics and a resin-sealed transformer to help protect the energiser in outdoor farming conditions. The magnetic switch design also avoids the need for holes through the outer casing.
Specifications
- Made in: Australia
- Brand: Thunderbird
- Model: S90B
- Product type: Solar electric fence energiser
- Maximum fence distance: Up to 10km
- Stored energy: 1 Joule
- Output energy: 0.71 Joules
- Voltage at no load: 7.8kV
- Voltage at 1000 ohms: 5.8kV
- Power: Solar with internal rechargeable battery
- 240V Mains charger: Included
- Mounting: Slides onto a steel star picket
- Display: Large LCD output display
- Power settings: High and low
- Warranty: 3 years
- View or download the Thunderbird Electric Fence Universal Energiser Manual
Frequently Asked Questions
How far can the Thunderbird S90B power an electric fence?
The S90B is rated for up to 10km of electric fencing. This is a guide only, as actual fence performance depends on fence construction, vegetation, earthing, wire thickness and other factors affecting the fence load.
Does the Thunderbird S90B have a built-in battery?
Yes. The S90B has a replaceable internal rechargeable battery that is charged by the built-in solar panel.
Can I recharge the S90B from mains power?
Yes. A mains recharger is supplied with the energiser, making it useful during extended periods of poor weather or low solar input.
Can the S90B be used for temporary electric fencing?
Yes. Its portable design makes it particularly suitable for temporary fencing, strip grazing and rotational grazing where the energiser may need to be moved between paddocks.
Can the S90B be used for permanent electric fencing?
Yes. The S90B can be used for suitable permanent electric fence installations as well as temporary fencing.
How does the Thunderbird S90B mount?
The energiser is designed to slide directly onto a standard steel star picket, providing a quick and convenient mounting option for portable electric fencing.
What animals can I use the S90B for?
The S90B can be used for suitable electric fencing applications involving livestock such as cattle, sheep, goats and horses, provided the fence is correctly designed, installed and maintained for the animals being managed.
What happens when the battery gets low?
A low battery warning indicates when the internal battery needs additional charging. The supplied mains charger can be used to recharge the unit when solar charging is insufficient.
Can I use the S90B for strip grazing?
Yes. Its portability, solar power and star picket mounting make the S90B a practical choice for strip grazing and rotational grazing systems where electric fencing is regularly moved.
Thunderbird 10km Solar Electric Fence Energiser S90B Features:
- Australian made solar electric fence energiser
- 3 Year Manufacturers Warranty
- Large easy to view LCD display
- O-Ring sealed case
- Fully portable
- Internal battery included.
- Fence leads and a mains recharger are supplied
- Light , easy and fast to set up
- Coated electronics
- Resin sealed transformer and SMD technology combine to form a high quality product.
- Weatherproof Magnetic Switch means no holes through outer casing.
- Ideal mould angle to maximise solar collection
- Low battery warning – lets you know when to mains recharge
- Fence and earth leads supplied with insulated grips.
- Mains charger port is covered – keeps weather out
- Low and high power levels for battery conservation
Replaces Old Thunderbird Energiser Model:
- Thunderbird S-75B Solar Energiser
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.
Watch: Setting up the Thunderbird Solar Electric Fence Energiser

Watch: Australian Made Thunderbird Solar Electric Fence Energiser production
















Alexander Curtis (verified owner) –