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Old 05-21-2009, 05:52 PM   #29
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I have a wide screen dell laptop that I use for TV. It seems to draw very little current but I don't do too many DVDs... mostly just for antenna, cable, or direct tv. I can do my computer work and keep a little TV screen going in one corner or make the whole screen a TV and just hot-key back and forth between applications.. The sound is not very good but the real killer for me is the inverter draw for the DTV receiver... I cant keep that going for more than three hours without having to switch batteries (deep cycle trailer batteries). The marine industry has a 12v DC DTV receiver but it is waaay costly.
Ron
A lot of the converter boxes are running on 12vdc internal and use a switching power supply to run from 120vac.

I have operated on the RCA for example and by simply bypassing the supply inside you can run it from 12vdc.

Worth looking into for sure.

Ed
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Old 05-21-2009, 07:14 PM   #30
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I'm stubbornly sticking to the notion of using an inverter with an ordinary 12VAC LCD TV. I returned the cheap and noisy 400W inverter purchased earlier and was told that a better quality, higher capacity inverter wouldn't be as noisy, something to do with a heavier aluminum case acting as a heat sink and the fan only running when needed. Anyone have any suggestions for a good quality low noise inverter?
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Old 05-21-2009, 07:37 PM   #31
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I have several inverters both cheap and not so cheap.
In general cheap or not they tend to get rid of heat generated during the inverting by using big noisy fans.
While you may be able to find one with a less noisy fan,I do not know of any of significant wattage that relies on passive cooling alone.

This is why finding a good place to stick one where the noise is masked or muted is the easiest solution probably.
Unless you can listen to them before buying while they are under load you are just going to have to get lucky I guess.

The TV should have a sticker on it telling the wattage requirements and if you just find an inverter that has a safe margin above that you should be fine in general.

Some electronics do require a better true sine wave than others and no cheap inverters really produce anything like a true clean sine wave.

Isn't this fun?
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Old 05-21-2009, 07:57 PM   #32
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Ed is absolutely correct (And yeah.. it's fun now that I don't have to do it all day for a living anymore... LOL!)

By the time you buy a decent quality sine wave inverter.. you might as well have spent the few extra bucks on a 12v tv in the first place. I have several small inverters for wot nots.. lamps, battery chargers etc.. stuff that isn't picky, and 1 true sine wave one.. at a measly 100w, for my computer and one of my old TVs, which was really sensitive (And small!) It cost over 120 bones. (And that was cheap in comparison to others)

However, the advantage is that the inverter is available for other stuff besides the TV.

I do however, stick to my rule.. if it can be had in 12v to start with, I run direct whenever possible. It's just cleaner and more efficient.
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Old 05-21-2009, 09:46 PM   #33
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Ron
A lot of the converter boxes are running on 12vdc internal and use a switching power supply to run from 120vac.

I have operated on the RCA for example and by simply bypassing the supply inside you can run it from 12vdc.

Worth looking into for sure.

Ed
You're HIRED! were do I send it?
If I wasn't heading to Alaska soon I'd try it.. Or pay someone else to try it! LOL
Actually I will loose the bird a few hundred miles into Canada so it matters not but thanks for heads up.

Ron
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