I have 20 identical devices (GPS trackers- QStarz BT-1300ST) which are charged by mini-USB cables. I have no need for data transfer, which is done by bluetooth.
I have bought two USB hubs that are powered from the wall and split to 10 USB charging cables.
But I want to build a custom wall-charger that is smaller, and doesn't have 20 ugly cables sticking out of it. Ideally, I'd like either a short, rigid cable which can support the weight of the device (just 22 grams), or an array of 20 mini-USB ports, like this pic, that are embedded or glued on a (3D-printed) structure.
(This is sort of similar to the iPhone Speaker systems, where the phone clips onto the adapter - although I'm looking for 20 smaller devices and no speakers)
My question: If I want to build a 20-device array charger, and each device needs 3-5 Volts of DC, can I take a 5V AC transformer with ~10 Amps, and split the cables 20 times, to get 0.5 Amps per device? I would then solder the power pins on the 20 mini-USB-ports.
Is this in any way dangerous to me or the device, or impracticle because of readily available consumer products?
I see things like this for DC power supplies, but nothing for (mini)USB, which is probably because most people need to also transfer data.
update 1 Device is USB 2.0. Here's the info from the manufactorer.