Is your gate more than 1,000 ft. from the nearest AC power source? Then charge the battery with one or more of these 5-watt solar panels. What's Included # Solar Panel - FM121 # Mounting post and hardware This 5 watt solar panel is a solar powered battery charger for use with all Mighty Mule models. Up to 15 Watts of solar charging power for Mighty Mule model FM700 (#7413AO). Up to 30 Watts of solar charging power for Mighty Mule models FM502 (#7413B) and FM350 (#7413C2) Installing an optional second battery is recommended for best performance of your gate opener.