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Subject Topic: 12v tv Post Reply Post New Topic
Message posted by wendyinfrance on 10/12/2013 at 7:15pm
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wendyinfrance
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hello there - this is my first posting so bear with me. We have a glamping site in france - we make our own yurts and try to live as sustainably as possible (but we aren't eco warriors!)Anyway we want to be able to use a tv outdoors (with a large screen) which we can power from a 12v battery so as to show films on a hot barmy evening occasionally!

Does anyone know a tv that will do this and can I just connect it straight to the 12v battery (and which battery should I get and where) - we want to buy a solar panel to charge this battery.

Finally could you give me an idea of how long the battery would charge the tv - we hope to get one that we can just plug in a USB stick with the film on it - I think the new tvs are LCD and use less energy but I need to know if it would work for say 3 or 4 hours or not.

Any other things that I haven't thought of please let me know - I won't have a cigarette lighter connection - do I need one and how would I connect this to the battery?

Many thanks for any help and advise
Wendy

Message posted by Grampian91 on 10/12/2013 at 7:35pm
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Depends how big the TV is and how many watts it draws.

The bigger the battery the better and the bigger the solar panel the better.

If you had a big TV that draws 100watts for 4 hours = 33.3 amps. You will get about 3 days from a 110Ah battery.

A 50W solar panel would need FULL sunshine for at least 8 hours to have a chance of putting back what you take out in 4 hours.



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These 2 figures must not exceed 3500kg. And the Caravans gross laden weight must not exceed the cars UNLADEN weight.

Unless the manufacturer has set a lower limit.

Message posted by Francophile1947 on 10/12/2013 at 8:43pm
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I'm not even aware of any 12V TVs that are larger than a portable, so you would probably need a 230V inverter, which will consume more power than the TV alone. Also, the battery will not give up all of it's capacity and the TV will cut off when the voltage drops. Realistically, you will need to charge the battery every day and what solar panel you choose will depend on where you are in France. Ideally go for the biggest panel you can afford, bearing in mind that they give a much lower output than they claim, especially if you don't keep turning it to face the sun.
You can connect to the battery with crocodile clips instead of a cigar lighter plug.

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Message posted by Jack+Jon on 10/12/2013 at 9:23pm
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I think you can take the eco thing too far. For example, your guests driving 100s of miles to you by car will do little for your carbon footprint. If you want a tv at all then just run it off the mains. If you use solar panels you will need a lot & they are all shipped in from China. So more evironmentally friendly to use mains power, particularly in France where it is supplied by pollution free nuclear power.

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Regards, Jack+Jon.

Message posted by G7ACU on 10/12/2013 at 10:22pm
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Does seem a bit of a challenge to me, considering the current drawn etc.
There is only one large screen TV that I've encountered that will run from 12v, which is a 32" offering from Kogan, which according to their website has a 60w (average) rating.

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Message posted by Dandyman Bob on 10/12/2013 at 11:31pm
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Using the example Paul gave the TV would use 5 amps per hour. If you have a 110amp battery approx. 1/2 of the power is available so your TV will work for 11 hours before the battery needs charging.
When we go to France we leave the TV at home because we are busy doing other things such as walks along a beach or river, eating out, boules etc. I think the only time we will take one is when we do extended touring.
Regards Bob.

Message posted by Vin Blanc on 11/12/2013 at 4:16pm
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Quote: Originally posted by wendyinfrance on 10/12/2013
We have a glamping site in france - we make our own yurts

???????????????  Are we speaking the same language?

I think I get the general idea of what you are trying to achieve but think that you really need to find some way of of providing an EHU (mains hook-up).

Using batteries to provide a 12v continuous heavy rating over many hours is not a simple task. 

And how are you going to re-charge them again ready for the next night's session without an EHU?

Vin Blanc

 

  



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Message posted by Vin Blanc on 12/12/2013 at 10:16am
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Having thought about this overnight, I think perhaps a small petrol generator maiy be the answer to your problem.

Obviously, the generator would have to be sited far enough away to avoid noise but it would provide a 230volt supply. Enough  to run a large TV and DVD player etc..

You could probably pick one up on E-Bay.

Vin Blanc



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It is sometimes better to say nothing and be thought a fool than to speak out and have it proven!

Message posted by Donnod123 on 21/12/2013 at 1:15am
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Hi
Just to throw another idea, rather than a large tv ..
What about a small "LED" projector ( 55inch screen size easily) they are coming down in price, getting better quality.
Have a look at the gadget show Webb site for them.

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Thank you Donnod123
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