...
Wifi AP mode and BT on, idle 400mA, 450mA under load
Stop hostapd -> idle drops to 292mA
rfkill does not seem to affect power usage
turning off bluetooth via gpio did not affect power usage
turning off wifi via gpio saw ~6mA drop in power usage
wifi in client mode only (ap off), see ~300mA just connected, 430mA when downloading a large file
earthstorm shows similar idle power consumption to ironstorm when power is turned off
on a summit expansion board (like tobi but no ethernet), idle power consumption is reduced to just 130mA
In summary:
- With WiFi off, idle power consumption is ~300mA
- 100% CPU use increases power consumption by ~50mA
- WiFi draws up to ~100mA (always 100mA in AP mode, varies with distance and usage in client mode)
- Further reductions in power use may be possible, but will require more work (possibly a custom kernel or u-boot modifications to disable the hdmi controller, etc)
...