All the smarts and power of the Gallagher i series with the NEW ability to power your energizer your way. Mains, battery or solar. The MB1800i provides fence information at a glance, informing you of any problems immediately  so you can take action to save time and money. With 18 Joules of stored energy, this energizer is suitable for fencing all types of animals, on farms up to 190 acres.