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Setup

• Cheap 24V -> 5V USB converter
• Current measurements takend by Fluke 187 in series with 400mA range selected
• Tested with FAST AVG and FAST MAX to catch transients

Current measurements @ 24V input

• Baseline for regulator with no Chormecast: 6.5mA quiescent current
• Idle: 65mA
• Playback via Google Play Music for one song (~5min): 68.3mA
• Max from USB hotplug -> boot -> playback: 150mA

Power Consumption

• P = 24V * 150mA = 3.6W

Thoughts

Google provides a 5V @ 1A power supply, but 4W is enough for non-peak continous usage.