Wiring USB ports in parallel
I'm installing two Motopower waterproof USB power ports on my bike. Both ports are rated at 3.1 amps, and are going to be used to power a GPS and a cell phone attached to my front accessory rail (I have a Super Tenere). I don't believe that the draw on either my GPS or phone exceed 2 amps. The Motopower ports appear to be wired with 18 GA wiring, though it isn't marked so I'm not sure. I have quick disconnects attached to each port so they can be easily disconnected for replacement or removal. I have a PC-8 mounted under my seat on a switched relay.
I'd like to wire the ports in series, with the two lines coming together immediately after the quick disconnects, in order to simplify the wire runs and so I only have to use one connection in the PC-8 (it's getting kind of crowded under the seat). The maximum amperage per circuit on the PC-8 is 20 amps (15 continuous). I was planning on using 14 gauge stranded wire for the supply line from the PC-8 to the two USB ports. The run from where the two ports would merge and the PC-8 is about 2 feet, maximum.
I'm not an electrical wiz, so:
Is there any reason not to wire it this way?
If they are wired in parallel, what size fuse should be used, based on the information above?
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