https://nemtek.com.au/product/agri-50km-energizer/

The Agri 50 km energizers can be powered with a battery or by mains, making them handy and adaptable depending on your needs. Most of the energizers use Nemtek APT technology, which ensures maximum power is delivered to the electric fence while minimising power losses along the fence line. With APT the energizer responds to changing environmental factors (such as changes in weather and vegetation growth on the fence), and adapts to the changing needs of the fence by maximising fence power and efficiency.

Features:

Powers up to 50km of fence/80 acres/32ha (Optimal conditions)
Robust weather resistant system
Battery charge state indicator
Energizer overload indicator
Day/night sensor
Powered by battery (sold separately) or mains power adaptor (included)
Adaptable mounting options (wall, fence wire, wooden post and also slides onto Y picket post)
Lightning protection
Many programmable options via the LCD handheld remote – (optional accessory) including adjustment of fence voltage and pulse rate, independent day/night setting, battery voltage reporting and fence performance monitoring
Specifications:

Dimensions    
190(L) x 115(W) x 76(D)mm

Output energy max    
4.5J (stored energy 6.5J)

Output voltage    
8.5kV @1000Ohms
8.5kV @500Ohms
9kV @ Open circuit

Power source    
Battery 12Vdc
External power supply 12Vdc

IP rating    
IP54