Powering an Alexa camera from an XCS Ultimate sled using 12V versus 24V input

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2012Sled forum

14 years old. Gear and prices may have changed since.

DisputedParticipants disagreed and reached no conclusion. Read the findings as positions, not as an answer.

The Alexa camera can accept input voltage between 10.5 and 34 volts DC across its three power connectors.
When 12V is supplied to the Alexa, the RS output connector will only provide 12V rather than the standard 24V output.
When voltage above 24V is supplied to the Alexa, the RS output connector matches the input voltage.
Powering the Alexa from a sled's 12V supply allows the sled to be turned off while maintaining camera power, which saves energy and reduces internal converter stress.
Users reported successful operation powering an Alexa with standard accessories from an XCS Ultimate sled for approximately two hours using four Dionic HC 90 batteries.
The Alexa accepts input from either the BAT connector, battery adapter back, or battery adapter top connector with the same voltage range specifications.

The practical difference in runtime between 12V and 24V sled power was not definitively tested or reported.
Some users reported noticing no difference between 12V and 24V operation, while others noted theoretical advantages to one approach.
The 24V output voltage limitation when using 12V input only matters if powering 24V-only accessories from the RS connector.
Discussion includes only experience with Alexa Plus and Studio models; applicability to other Alexa variants may differ.