All Mighty Mule gate openers are battery operated, low voltage systems. The battery can be charged and maintained by the transformer included with each system OR by the Mighty Mule solar panel chargers FM121 or FM123
to maintain the battery charge.
The Mighty Mule FM121
solar panel is a 5 Watt. The Mighty Mule FM123
is a 10 Watt. Solar power will have some limits as to the maximum number of gate cycles to expect per day given the zone in which you live.
See the cycles per day chart below to determine the appropriate amount of solar panel kits you will need to reliably meet your needs.