here is a chart of recomended wire gauge for current draw. Your current draw can be checked by dividing you total system watts by 12 volts (ie 360 watts total power would be 30 amps of current.) Make sure to add up the power of all amps connected thru the power cable and then cross reference the chart. Hope this helps.
Length of run (in feet)
Current 0-4 4-7 7-10 10-13 13-16 16-19 19-22 22-28
0-20A 14 12 12 10 10 8 8 8
20-35A 12 10 8 8 6 6 6 4
35-50A 10 8 8 6 6 4 4 4
50-65A 8 8 6 4 4 4 4 2
65-85A 6 6 4 4 2 2 2 0
85-105A 6 6 4 2 2 2 2 0
105-125A 4 4 4 2 2 0 0 0
125-150A 2 2 2 2 0 0 0 00
Sorry the chart gets screwed up, for some reason it will not show more than one space
