Battery Power 
product Power Media Battery Power /product/3m-3-pin-xlr-m-3-pin-xlr-f/ $11 Power Media 3 Pin 3Pin
Power Media · Battery Power
3m 3-Pin XLR (M) > 3-Pin XLR (F)
You might also need
Battery Power 
10/15amp IP66 to Plug Adaptor
Battery Power 
10A 4 way IP66 RCD Power Board w/ 1.8m braided lead
Battery Power 
10amp / 10m Extension Lead 1.5mm Rubber Flex Cable (Green Tag)
Battery Power 
10amp / 10m Extension Lead Piggyback (Blue Tag)
Battery Power 