2010Cameras (Film/Video/HD) forum
Arri Alexa power supply voltage display and external sled power compatibility
16 years old. Gear and prices may have changed since.
What the thread found
- The Alexa operates internally at 24 volts and requires a power supply delivering over 90 watts.
- The camera accepts input voltages between 11 and 34 volts DC through the BAT connector and automatically selects the highest voltage source when multiple power inputs are connected.
- A voltage reading of 13.5 volts on the display while connected to external sled power suggests the sled output may be below the required 24 volts, and the voltage at the power connector should be measured to verify.
- When multiple power sources are connected, the camera automatically switches to whichever source has the highest voltage, and sources can be connected or disconnected while the camera is powered.
- Using a 24 volt power source is more efficient than using 14.4 volt sources for this camera.
- The power draw of the camera with a basic viewfinder configuration is approximately 85 watts.
Depends on
- The thread discusses a specific integration with an Mk-V Nexus sled and references particular connector types and cable configurations that may vary by setup.
- The solution was not fully resolved in the thread—the cause of the low voltage reading was not definitively determined.
- Troubleshooting suggestions reference specific D and J box equipment and center cable components whose details are incomplete.