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Arri 35 BL4 current consumption


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#1 Jean-Louis Seguin

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Posted 09 September 2011 - 08:05 AM

Hi everyone,

Does anyone have the specs for this?

I'm making a battery pack and trying to gauge what is an appropriate capacity for the cells.

Thanks.

Jean-Louis
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#2 Tom Jensen

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Posted 09 September 2011 - 10:25 AM

Hi everyone,

Does anyone have the specs for this?

I'm making a battery pack and trying to gauge what is an appropriate capacity for the cells.

Thanks.

Jean-Louis


I probably shouldn't answer this because I can't really remember.:lol: I think it's between 2.5-3 amps.
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#3 Jean-Louis Seguin

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Posted 09 September 2011 - 11:47 AM

That sound about right. I see that block batteries seem to be used a lot for these cameras and these are around 7Ah to 8Ah which would be a good match. Thanks.

Jean-Louis
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#4 Jean-Louis Seguin

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Posted 10 September 2011 - 08:21 AM

Another question:

Can someone confirm if the camera be safely connected to a 13.2V or 14.4V battery source?

Thanks.

Jean-Louis
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#5 Tom Jensen

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Posted 10 September 2011 - 09:43 AM

Again, my memory ain't great but I'm going to say 14.4.
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#6 Dom Jaeger

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Posted 11 September 2011 - 11:27 PM

Hi Jean-Louis,

you and Tom seem to have worked it out already, but for what it's worth, I have specs for the BL4s - I think it's pretty similar to a BL4 in terms of current draw.

The camera movement alone should draw 1.8 A.
At 24/25 fps with a 400' load the draw should be 2.5 - 3 A.

Of course, if you're running enough accessories from the camera accessory socket (lens light, heated eyepiece, split, mini-monitor, Preston etc) you can easily double that. I think the supply fuse is 7 amps.

12V 7Ah lead-acid block batteries were pretty standard for these cameras, but if more weight isn't an issue and there are a few accessories to power a 12Ah cell is better.

If you're going with NiCads, you should be OK with 14.4V (we never had a problem). You're definitely fine with 13.2V.
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#7 Tom Jensen

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Posted 12 September 2011 - 12:55 AM

Lucky guess.
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#8 Dom Jaeger

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Posted 12 September 2011 - 03:11 AM

I think the supply fuse is 7 amps.


Just to clarify, that's the in-camera accessory supply pico fuse, not the battery fuse.

For the battery I'd use a 15 amp fuse - the start-up current can potentially spike above 10 amps.
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#9 Jean-Louis Seguin

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Posted 17 September 2011 - 08:40 AM

Thanks to all that replied!

Cheers,
Jean-Louis
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