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Power inverters - 12V to 24V


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#1 xddj

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Posted 31 March 2005 - 03:14 AM

I`m looking for power inverter for film cameras, but I don`t know theirs power consumption. Could someone share this info with me.

Will 1A@24V be enough to power let say Movicam or Arri cams?

Marcin
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#2 Eric Fletcher S.O.C.

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Posted 31 March 2005 - 03:20 AM

I`m looking for power inverter for film cameras, but I don`t know theirs power consumption. Could someone share this info with me.

Will 1A@24V be enough to power let say Movicam or Arri cams?

Marcin

<{POST_SNAPBACK}>


No not nearly enough. Try 20 amps for a 435 starting up. 12 amps for the arricams
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#3 RobVanGelder

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Posted 31 March 2005 - 08:25 AM

And if you have to run 150 fps with that 435, you won´t make it with 24 volts.....
you need 28 to 32 volts to get up to speed! At that amperage!

Few converters can handle this, without dipping down below the camera´s minimum.
Therefore it is often better to do this with a double (2 x 14.4 volts) battery system.
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#4 xddj

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Posted 31 March 2005 - 10:45 AM

Yeah! That was my first thought to put two 14.4V battery pack in serial, but then I saw that most of the rig producers/upgraters have inverters on theirs products - that is were the question arised.

Anyway great to hear that the common use it the standard one of combining two batteries ;)

Thanks for help
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#5 JimBartell

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Posted 31 March 2005 - 11:45 AM

A cheap, simple, lightweight method of doing this is to add a NP-1 battery/battery mount for the second battery to supply the extra voltage. NP-1's are cheap, relatively light, and come in a wide variety of voltages & capacities. Also, one NP-1 will handle about 4 mag's worth of film and start up virtually any camera out there. The mounts are under $100 and chargers are relatively inexpensive as well. A DC-DC converter capable of handling this much current will weigh much more than a NP-1 will and cost a fortune.

Jim "battery included" Bartell
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#6 xddj

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Posted 01 April 2005 - 10:18 AM

Thanks Jim - make sens NP`s are very cheap.

All in all, I`m thinking of changing batery system on my rig. I`m curently useing PAGlok with brick battery, but they are very expensive and I can`t do much with only two bricks. And buying new battery is just crazy. I could easly do 4-5 battery packs from modellers power cells - high-cap NiCd...

More I`m getting into this stuff, more I think that all I`m paying is the brand... but hey, that`s the way it is, all a ned to do is accept the fact :/
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#7 JimBartell

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Posted 01 April 2005 - 12:35 PM

If you are thinking of changing your battery system entirely, may I suggest DeWalt power tool rechargeable batteries? They have models that are the same voltage and capacity as other "professional" video and film batteries, but at a fraction of the cost for the batteries, mounting plates and chargers. Several operators have done this and reported excellent results.

Jim "affordable alternative expert" Bartell
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