Topic: TP-link MR3020 - USB WiFi not working when powered by car charger
I've flashed OpenWRT and installed USB drivers for ralink 3070. All is setup and working great when using the power from the AC wall USB charger. I'm able to use the USB ralink WiFi adapter as a long range WiFi client and broadcast my own WiFi network using the internal WiFi all of which works great.
My issue is when i power the device using a car 12v ciggy adapter which outputs 2 x 5v USB ports (1 rated at 2.1A and the other at 1.2A) the device powers up and i can access the CLI using the internal WiFI but my external USB ralink adapter does not connect to any networks. The USB WiFI adapter is still listed in the interfaces section and i can see WiFi networks when i click "scan" but it just wont connect to any of those networks.
If i plug it back into a mains AC wall charger with the USB everything is working fine again so it seems to be a power issue. My thoughts are the car charger isnt giving out enough power for the USB WiFi to work? Any thoughts on what i would i need to get this working using a car adapter please? Is it as simple as finding a more powerful car charger or is something else needed?