Very simple version.
Note - 27W LEDs pull about 2 amps each, I have five per switch (that's 10A) and a switch rated at 15A.
16 ga wiring from each light home run to switch panel, all Grounds tied together inside the panel, all positive wires tie to one side of the switch and Battery ties to the other.
Depending on total number of lights and total number of amps, your battery feed to your switch box will likely need to be minimum 10 ga, most run 6 ga I believe.
Search and read... Good Luck