I can put my AR300M-Lite on an ammeter this evening. Primary variation will be on the loading of the CPU. There will likely be some variation based on the number of Ethernet cables connected and if EE is enabled or not. I can only check one Ethernet cable on the AR300M-Lite. My experience with a vaguely similar Archer C7 v2 (QCA9558 at 720 MHz) was an increase of close to 1 W between “idle” and the CPU being hammered with a tight loop outputting over SSH. Adding an Ethernet connection with EE enabled added very roughly 0.1 W.
which would be consistent with 400 mA or less for the router itself, and 500 mA for USB 2.0. There may be a fuse, fusible link, or other limitation between the supply and the USB port.
So, after some additional homework… safe to assume that absolute worst case would be 400ma for the AR300M, and I’m going to assume 500ma additional for USB peripheral, even though I’ve seen some discussion for AR150 that suggests up to 1A is possible…
So that works great for this little project I’m working on…