User guide

Power Supply Power Management 17
8 Power Supply
• Only use recommended power supply solutions.
• Manipulation of power supplies can result in severe damage to
the equipment and humans, including death.
ALEXA accepts an input voltage range from 11 to 34 V DC. The camera
can be powered through the BAT connector or can be quipped with
battery adapters accepting V-Mount or Gold mount batteries.
The power supply should deliver an output of more than 90 W to power
the camera sufficiently. The power draw of the camera in basic
configuration is about 85 W.
Note: when powering accessories through the camera, the power draw of the
camera is increased by the amount of power drawn by the accessories.
8.1 Power Management
When using the BAT connector and one or more onboard battery
adapters at once, the camera power management ensures that always
the power source with the highest voltage level is used. When the
voltage level of one power source drops below the level of the other, or
a power source is disconnected from the camera, the power
management automatically switches to the other power source,
avoiding shutdown of the system.
So as an example, one could use a 12 V onboard battery as backup for
the main 24 V battery, or power the camera from the 24 V battery while
on a tripod and use the 12 V battery for fast switching to handheld
mode by just unplugging the power cable.
When using two onboard battery adapters with batteries in parallel,
they are treated as one source by the camera. This allows combining
small batteries with less load per item into one strong power source.