Power Management 21
7 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 10.5 to 34 V DC. The camera
can be powered through the BAT connector or can be equipped with battery
adapters accepting V-Lock 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.
A 12-15 V battery should have at least 6 A maximum output current.
Note: when powering accessories through the camera, the power draw of the camera
is increased by the amount of power drawn by the accessories.
7.1 Power Management
When using the BAT connector and one or more onboard battery adapters
simultaneously, the camera power management ensures that 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 (one on
top and one on the back), they are treated as one source by the camera.
This allows combining small batteries with less load per item into one strong
power source.
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