The Gallagher MB150 electric fence energiser is a multi-power energizer that works on 230V, but it can also be used with a 12V battery. The energizer is easy to move, because of its unique design. The LED shows the status of the battery when it is connected. The energizer can power fencing of up to 15 km and comes with a set of connecting cables.
Mains power supply sold separately https://www.directfarmsupplies.co.uk/product/power-supply-230v12v-2/