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External battery pack questions

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u_rebelscum:
@protokatie,
I did some more testing on the UPS, and none of the battery plugs worked for my camera.  The funny thing was that none of them worked when the UPS was plugged into the wall, too.  (The surge side worked fine when plugged in.)  The UPS is an APC brand UPS, and is able to power a computer for minutes fine.
:dunno

I'm asking pure sine vs modified sine wave because some stuff requires pure sine (x10), when most intverters output modified sine (or even worse, plain square wave).

I haven't tried other UPS or bought an inverter, yet.  Nor tested the voltage on the UPS; I'm very curious on what's happening with that UPS. 

Are what you talking about any different from the normal modified sine wave inverters?  Any good links?  I've found stuff that cost <$10 to multiple hundreds of dollars.


@DrumAnBass
12V batery packs with shoulder cary cases & cigarette outlets.  If the car inverter works, these would be the easy and clean way to carry around the battery, for sure.  I little more expensive, but not an ugly hack by me (that might fall apart at the wrong timie).  I'll definately look into these.  Thanks.

protokatie:
If you are willing to do a little experiment, buy a decent sized capacitor and put it across the lines (make sure to get the polarity right) on the DC end of your cameras power supply. I am wondering if the AC to DC converter might not have a big enough cap in it to smooth out the pulsed DC the rectifier generates. If this is the case, then the camera would be the thing insensitive to the DC produced during the AC/DC conversion. I would really like to see what voltages you get off of the UPS, as well, if you have access to an occilloscope I wonder what the waveform looks like on on the UPS output as well as on the DC the converter is giving off.

As per waveform from inverters, one thing to keep in mind is that the greater load they are under, the less accurate the sine wave is. I havent looked into an inverter for a long time, so maybe a google search would be useful in finding models that output very stable voltages as well as a good sinewave.

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