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Submitted on
January 22, 2010
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Make
Canon
Model
Canon EOS 5D
Shutter Speed
1/32 second
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F/2.8
Focal Length
50 mm
ISO Speed
640
Date Taken
Jan 22, 2010, 10:41:01 PM
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Portable PSU 1 by CasePhoto Portable PSU 1 by CasePhoto
I wanted to run my Elinchrom D-lite 4s outside.

I did not have enough money for the portable power supplys that are meant for this, from my understanding the cheaper ones just don't work with the D4s. *sadface*

But thats okay, because this UPS does ! cost : 120$.

Aaaand it works, even fires both of them at full power !

Drawbacks include, weight, safety turn off features if the flashes are fired too quickly.

And no portability... which is what i wanted this for Right ?

So with that onto step 2: [link]
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:iconcasephoto:
CasePhoto Featured By Owner Feb 15, 2010  Professional Photographer
This specific model has a ton of displayed information if you want, hertz, watts load, voltage, etc.

it does 60hz i believe, and i have been told that its a relatively clean output in terms of waves.
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BiOzZ Featured By Owner Feb 14, 2010  Hobbyist Photographer
dude that's brilliant
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:iconcasephoto:
CasePhoto Featured By Owner Feb 14, 2010  Professional Photographer
A much more knowledgeable electrician has brought to my attention that any simulated (stepped) sine wave can/will damage most sensitive electronics over time.

Mine are still going strong, and maybe the stepping on that particular UPS isn't as bad as others, but its definitely try at your own risk.
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:iconbiozz:
BiOzZ Featured By Owner Feb 14, 2010  Hobbyist Photographer
well not really .... if you can simulate 59.5-60.5 hz electronics wont be effected ... i have done several hacks to these things including replacing the 2 7ah wet-pack batteries with 250AH "lawn and garden" batteries and i have ran computers for hours and hours with no problems at all

sticking a transformer and a scope on the output of the sine wave is just like the sine wave of a 120v mains ... simulated 24step sine waves that are smoothed with internal inductors and capacitors are nearly perfect with loads up to 10 amps (as high as i have pushed it)

im young but trust me i know my stuff XD

(sorry, English is not my primarry language)
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:iconcasephoto:
CasePhoto Featured By Owner Feb 15, 2010  Professional Photographer
I guess the best way to find out how safe a specific model is would be to take it with an oscillator and see the actual wave or how close the stepping is.

I believe this affects flashes more then other electronics on the basis of the LARGE quantitys of current drawn in relatively short bursts.

But you probably have a better grasp on it then me, i was just told, don't do it, it'll fry shit, by a few people, and since it hasn't i might use it a bit more, but with caution and at my own risk.
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:iconbiozz:
BiOzZ Featured By Owner Feb 15, 2010  Hobbyist Photographer
well thats expensive and tedious XD .... to think about it i have a computer running in my car 12 hours a day off a inverter (that works of the same prenciple as an UPS

well the thing about that is no matter what flash you are using it is internally rectified so no matter what it turns in to a solid DC wave ... and he primary charging capacitor takes the load off the line ... personally i use the SB-900 flash units that uses rechargeable battery packs so i cant test it but its basic electronic knolage

what is displayed on the front of the UPS?
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:iconcasephoto:
CasePhoto Featured By Owner Feb 16, 2010  Professional Photographer
This particular model has a whole bunch of info that can be displayed.

Watt loads, Hertz, Voltage, etc.

Its 60hz, it peaks at about 760watts when it charges the flashes for maybe a second.

I don't think a car needs an inverter, it runs off the DC battery, and keeps most of it in DC for the insides *i think*, you can plug inverters Off, of your car's PowerSupply.

I mean, stepped sine waves, can, and do, definitely damage sensitive electronics, like flashes. Some flashes have blown from 1 fire off a stepped wave. Theres probably quite a few variables, which have kept mine safe for now. I would still definitely be looking at a pure sine-wave inverter for the long run for the added safety, power, and bigger batterys.
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:iconbiozz:
BiOzZ Featured By Owner Feb 16, 2010  Hobbyist Photographer
as long as it does not exceed 120V out than no damage can be done to electronics and the fact that it can display the voltage means it must be internally regulated

i drive a Nissan skyline GTR and the cars computer is a high prominence racing computer that needs 120Vac to power it so i use an inverter

sine waves can effect electronics that rely on the 60HV like clocks and TVs ... flashes convert any sine wave to a rectified 100V solid DC voltage

we run flashes, lights, computers, cameras, fans, monitors and tvs from gas powered generators and 24-120v inverters furring field shoots and never once has we had something fry that we could not point to some cause and never from the generator because every single thing we own uses ac-dc converters that are directly rectified
the fact that sine waves even exist is because DC voltage cant travel long distences and diffrent places have diffrent frequencies (50hz in europe 60 in use and 30-80 hz in others)

the only point of failure i can think of in rectified devices is if the frequency produces is faster than the rectifying diodes can handle ... but that's several KHZ
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:iconcasephoto:
CasePhoto Featured By Owner Feb 16, 2010  Professional Photographer
And portable Speedlights, Nikon/Vivitar/Canon/etc.

Are all made to run off DC.

These are made to run off AC, they use alot more power, i do not think they even attempt to turn it into DC at any point.

Some of the more portable studio flashes Might, since they are meant to be plugged in to their very own specific psus, but i wouldn't know about them.
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