Installation Guide
2 MM462 Installation Instructions 
1. Determine Charging Options for Battery: Transformer OR Solar
NEVER USE TRANSFORMER AND SOLAR PANEL(S) AT THE SAME TIME!
It will damage the control board!
IMPORTANT
  •  The battery charge is maintained by the 14 Volt transformer included OR optional solar panel(s). The transformer 
OR solar panel is connected to the control board using low voltage, 16 gauge, dual conductor, stranded, direct 
burial wire [RB509] (page 26).
  •  All low voltage wire used with the Mighty Mule Gate Opener must be 16 gauge dual conductor, stranded, direct 
burial wire.
  •  The transformer is intended for indoor use. If the transformer can only be plugged into an outside electrical 
outlet, a weatherproof cover or housing must be used. 
  •  If your gate is more than 1000' from an AC power source, you will need to use a solar panel charging kit 
(minimum 10 watts). Refer to the Solar Panels and Gate Activity Chart below.
Solar Panel and Gate Activity Chart
The table and map illustrate the 
maximum number of gate cycles 
to expect per day in a particular 
area when using from 10 to 20 
watts of solar charging power 
prior to the battery depleting to a state where 
the unit will not function. The figures shown 
are for winter (minimum sunlight) and do not 
account for the use of any accessory items.
Accessories connected to your system 
will draw additional power from the 
battery and will require additional solar 
panels.
NOTE: UP to 250 ft. of dual conductor, 16 
gauge, stranded wire may be used to allow 
installation of solar panels in direct sunlight.
See page 26:
10 Watt Solar Panel [FM123]
5 Watt Solar Panel [FM121]
Dual Gate 
Winter Ratings
Zone 1 Zone 2 Zone 3
10 Watts 8 16 26
15 Watts 11 20 30
20 Watts 14 28 38
Before You Begin
Zone 3
Zone 1
Zone 2
Zone 3
Zone 3
Zone 3










