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Powering Alexa From Master Sled


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#1 Neal Bryant

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Posted 19 August 2014 - 10:37 PM

I can't seem to find anything in the search or any literature anywhere on what gauge wiring is inside the Master sled.

I used Afton's wonderful instructions to add a second battery to make my sled native 24v, and I've powered several 24v cameras just fine, but I'm a little concerned about the 85w Alexa.

Still, the Master has a 15amp breaker. An Alexa at 24v draws roughly 3.5 amps, add another 4 amps for AKS and I should be well within the limits... I've never had a bad experience with my Master wiring, I just want to be triple sure that I don't blow anything up!

Whenever I've used the Alexa in the past, I just run an onboard battery, but I would like to shave a little weight.

Edited by Neal Bryant, 19 August 2014 - 10:38 PM.

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#2 Brian Freesh

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Posted 19 August 2014 - 10:46 PM

I don't have the answer you are looking for, but I bet Dave Grove, Peter Abraham, Afton, and many others have run 435s at 120-150 fps without issue (granted they don't run that hot for long periods of time).


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#3 Neal Bryant

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Posted 20 August 2014 - 11:22 PM

Thanks for the reply, Brian. I think it would be fine, I just wish I could find out exactly what gauge the wiring is, then at least I could make an educated guess.

I have powered Epics (60w) with full AKS, so that's not far behind the 85w Alexa.
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#4 Chris Callarman

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Posted 21 August 2014 - 09:30 PM

Not sure what the gauge is or if this picture helps, but I recently removed the lower I/O panel from my Master sled and this is one of the power cables that I cut that goes up the post from the 24v adapter.

 

 

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#5 Eric Fletcher S.O.C.

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Posted 22 August 2014 - 01:40 AM

That looks like 22 or 24ga a wire and that's what would be called undersized


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#6 Alan Rencher

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Posted 22 August 2014 - 01:54 AM

That pictures shows it's about 1/16" thick, which is about 16 AWG. That should be plenty.
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#7 Neal Bryant

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Posted 22 August 2014 - 02:36 AM

Thanks for the responses, guys. I also had it measured today and was told it was 16AWG. Just doing a bit of research looks like it's well within the limits.
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#8 Neal Bryant

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Posted 22 August 2014 - 02:47 AM

On this job I prepped today it looks like I'm going to keep an onboard battery anyway just to get fore/aft balance. With my Alexa plate from Cinematic Precision and this Fujinon 19-90, a lightweight brick back there is giving me just what I need. Although, it's nice knowing that I could choose to power the camera from my sled should the need arise. Up until now I've been too gun-shy to try.
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#9 Afton Grant

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Posted 22 August 2014 - 06:29 AM

When I overhauled my master rig, I recall the wiring being fairly substantial - I think 16awg. It would power an Alexa, as well as high speed 435 work, no problem.
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