Powering Raspberry Pi devices from a Fritz!Box USB connection
Posted by jpluimers on 2017/03/30
I tried to power both Raspberry B+ and Raspberry 2 B devices via the USB ports of both a Fritz!Box 7490 and Fritz!Box 7360.
At first this works, but the Raspberry B+ devices over time would become unstable: not being able to ping and/or boot.
So below are some links on power requirements and powering Raspberry Pi A, B, A+, B+, 2B and zero.
Fazit/TL;DR: use an external power supply when available.
- Raspberry Pi: Grundlagen der Energieversorgung / Stromversorgung [WayBack]
- Raspberry Pi: Stromverbrauch messen [WayBack] (Tables of actual measurements with Raspberry Pi Modell A, A+, B (Rev. 2), B+, RPi 2 B, RPi Zero, Odroid-C1
- PortaPow Premium USB + DC Power Monitor [WayBack]
- Mixed results for Raspberry B 512:
- Original Pi B draws too much power Build your own 6 watts home server using an raspberry pi | Ruberg’s blog [WayBack]
- Fritz!Box shares 500 mA with all USB ports, so only works when operating your Pi headless: Raspberry Pi über Fritzbox mit Strom versorgen [WayBack]
- power supply – Powering with USB 3.0 from FritzBox 7490 – Raspberry Pi Stack Exchange [WayBack]
- USB 3.0 minimum power provided is 150 mA: power supply – Powering from my PC’s USB 3.0 port – Raspberry Pi Stack Exchange [WayBack]
- USB < 3.0 minimum power provided is 100 mA: USB Power – Wikipedia, the free encyclopedia
- Rebooting a Firtz!Box will now power-cycle USB (my own experience).
BTW: The 2B is way faster which begins at boot: booting (with OpenSuSE Tumbleweed) until
eth0 responds to ping is around 50 seconds.