Originally Posted by SimonV
I think everyone is reading into this to much, all you need is a car 12v cigar lighter, two wires and costing less than 25 bucks. Go with 6 gauge wire you will have less voltage drop, an extra Battery would not hurt as you sound like you like gadgets.
Bingo!!!!!! 12GA or 10GA should be fine if the run is not long. None of these 12V outlets are rated for more than 15A and a cell phone draws less than .2A to charge.
1- Drill hole for 12V outlet
2- Connect red wire to center pin and black or yellow to the barrel.
3- Run black or tellow to the DC neg bus
4- Run red wire to DC panel or breaker with appropriate fuse for the wire and the 12V outlets max ampacity
5- Buy USB 12V outlet charger at Wal*Mart, eBay, Amazon etc.