When it boots, with the 7" RCA screen on, it takes 0.24 Amps. This remains the same when starting the Headless Console, with user-exits, battery monitoring, and re-broadcasting on HTTP and TCP.
When the small RCA screen is turned off, the consumption drops to 0.19 to 0.20 Amps.
As
P = UI
, that means that the Raspberry PI at works takes about 1 Watt (5v × 0.2 A).
This even below what the Raspberry PI documentation is saying!