My outernet setup worked first time on the battery.
As I wanted to run it 24/7 I needed to run it from an AC
I had several 240/5V plug packs and had a frustrating time
getting one to work. All were rated at one amp or more.
It wasn’t until I measured the current required to run the
outernet hardware that the reason become clear. All of the problems came from
the USB leads I tried. The voltage drop in them was excessive.
In the end I made a USB lead from cable with more than four
times the cross sectional area than the usual leads you buy.
This cable is rated for seven amps. Even so there is .2Volt
drop in one metre of this cable.
One only wonders at the wisdom of using 5V for high current
devices. No matter how you try you can’t overcome I²R losses.
5V USB power supplies were meant for low current devices.