The Wiert Corner – irregular stream of stuff

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:
  • Pi über Fritz!Box USB-Ausgang versorgen
  • Raspberry Pi • View topic – Fritzbox USB port for power supply? [WayBack]
• 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.

–jeroen