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 MB2800i provides fence information at a glance, informing you of any problems immediately  so you can take action to save time and money. With 28 Joules of stored energy, this energizer is suitable for fencing all types of animals, on farms up to 300 acres.