What Size Inverter For Projector?

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What Size Inverter For Projector?

Postby TheDocmeister » 05 Dec 2017, 10:07

I'm going to fit a mini projector and screen in our van to give big screen movie or PS2 action on longer journeys :ok

Now I know there are 12v versions about, but they generally seem to be a bit older, a bit dimmer and have poorer reviews than some of the current crop. My plan therefore is to go for one of these:
https://www.amazon.co.uk/Projector-GooDee-Efficiency-Portable-Support-Black/dp/B0744B3H21/ref=sr_1_5?ie=UTF8&qid=1512295746&sr=8-5&keywords=mini+projector
Only issue is that my school physics is all a bit hazy now, so my question is with a power draw of 50W at 240V, do I just need a 50W inverter to power it? I know this is a pretty inefficient way to go about it, but the specs of the projector make it worthwhile - and I could run it from hook-up too.
Would I be better with a slightly bigger output inverter - or any recommendations on specific models/ brands? How much of a drain on my leisure battery am I looking at?
All thoughts appreciated!
Last edited by TheDocmeister on 05 Jan 2018, 11:05, edited 1 time in total.
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Re: Inverter Calculations

Postby bigbadbob76 » 05 Dec 2017, 13:31

To run a 50W device I'd be looking at a 100W inverter, always best to over spec stuff like that to improve it's life.
The device will still only draw 50W from a 100W inverter.

50W would draw about 4 amps from your leisure battery but inverters are only about 80% efficient so it'll probably take more like 5A.
Plus whatever your PS2 draws, probably about 6A if you use an in car adapter.

Hope that helps. :ok
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Re: Inverter Calculations

Postby itchyfeet » 05 Dec 2017, 14:10

You need to over rate the invertor because of inrush current.
I'm not sure there is a rule of thumb as to how much
even small devices can demand say 20A mains for very short duration ( microseconds) at switch on, this van cause an invertor to cut out.

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Re: Inverter Calculations

Postby CovKid » 08 Dec 2017, 13:47

We use a pocket projector for presentations at work - its amazing how good it is for the size. Check those out before paying for something overkill.
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Re: Inverter Calculations

Postby 123-jn » 10 Dec 2017, 16:57

Some great LED projectors about now as well.
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Re: Inverter Calculations

Postby TheDocmeister » 11 Dec 2017, 18:56

CovKid wrote:We use a pocket projector for presentations at work - its amazing how good it is for the size. Check those out before paying for something overkill.


Yeah, I've been looking at those too. Seem to be mixed reviews on the Philips ones and much lower Lumens ratings - although I may be missing something there. They also seem to run on 12v - or at least charge via 12v. What model do you use?
We've got all round silver screens and blackout lined curtains, so pretty sure I can get the van dark enough for these lower output LED devices, so if anyone has experience of any particular models I'm all ears!
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Re: What Size Inverter For Projector?

Postby TheDocmeister » 05 Jan 2018, 11:07

Picked up a Philips Pico projector for a bargain price on Ebay! Well, cheap enough to risk having a go with it...
First impressions are good, hopefully have the screen installed in the van today - new thread ahoy! :ok
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Re: What Size Inverter For Projector?

Postby CovKid » 08 Jan 2018, 11:52

Should work fine. If its too light outside, no reason not to go out, and if its raining, well, theres always snakes & ladders :D
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