12v power lead

Discussion in 'Motorhome Chat' started by markymark, May 18, 2009.

  1. markymark

    markymark Read Only Funster

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    We have a telly in the van which we only watch when we are hooked up to the mains. It has a 3 pin mains plug wich goes to a converter box and comes out at 12V and plugs into the telly.
    If we wanted to watch it using the lesiure battery where would we get a 12v lead with the 2 pin prongs on to plug into the socket?

    Is there an adapater to convert 3 pin plugs into the caravan 12v 2 prong types
     
  2. pappajohn

    pappajohn Funster Life Member

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    try maplins for the TV plug.

    the lead is easy to make up with wire from a motoring shop and the two pin plug can be bought from any caravan shop.

    when you say the two pin plug i assume you mean the one that goes in the wall socket.....one larger pin and one smaller one.?

    i dont understand why you would want a converter from the 240v 3 pin plug to a 12v 2 pin plug
     
    Last edited: May 18, 2009
  3. pappajohn

    pappajohn Funster Life Member

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    to do the job safely you should use one of <<these>>

    some folks dont agree but i wouldnt use my TV without one.

    it may be £40 but LCD TVs dont like much over 12v and will blow if a higher voltage is applied like when you first switch off the engine or have a solar panel. the battery may be at 14v,ish for a short while.

    only snag is the cigar plug has the fuse inbuilt so you would need to fit an inline fuse if you change the plug to a two pin.
     
  4. markymark

    markymark Read Only Funster

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    Yes the socket in the wall is described as a caravan 12v socket on maplins site, but couldnt find any plugs to go in it. They both appeared to be flat and of the same size. Will do as you say and ask a caravan place what they think.
     
  5. pappajohn

    pappajohn Funster Life Member

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    they do appear the same size but one is maybe 1mm smaller in width than the other so you cant plug it in the 'wrong' way round and have 12v were it should be earth (0v)

    what make/model is the TV ?

    i can maybe find the correct plug for the TV end.
     
    Last edited: May 18, 2009
  6. markymark

    markymark Read Only Funster

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    will just check tesco site where i got it from
     
  7. markymark

    markymark Read Only Funster

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  8. derekfaeberwick

    derekfaeberwick Read Only Funster

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    Two pin to cigarette socket from caravan shop is the way to go. :thumb:
     
  9. pappajohn

    pappajohn Funster Life Member

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    not the tidiest solution but certainly the easiest:thumb:
     
  10. markymark

    markymark Read Only Funster

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    I would need either a 2 pin lead or a ciggy lead, some sort of converter from 3 to 2 pin plug even better, will see what caravan place has to offer.

    Thanks for advise, any brain waves please drop me a line
    Cheers
     
    Last edited: May 18, 2009
  11. pappajohn

    pappajohn Funster Life Member

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  12. pappajohn

    pappajohn Funster Life Member

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    i think i know where youre coming from with the converter.

    if using on 12v you dont need the transformer (black) box......just plug the new lead straight into the 12v wall socket and the other end into the TV socket.
    one wire with a plug on each end , NO BLACK BOX.

    the TV runs on 12v so the transformer (black) box is only to convert 240v to 12v when using mains

    this is the caravan plug you need....TWO PIN PLUG
     
    Last edited: May 19, 2009
  13. gazznsam

    gazznsam Read Only Funster

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    i'll just agree with what pappajohn said earlier about not running the tv directly off the battery, get one of those 12 volt power bricks, takes from 10 to 18 volts in, along with all the noise, hash and ripple on the line, and outputs exactly 12.3 volts of pure clean power, electronicaly protected and so on.

    i have one i bought at a motorhome show about 5 years ago, i run all my entertianment equipment on it (handles upto 8 amps)

    reason to use one, modern TV's are all built to a price, and the components in them are rated for the voltage they run on and hardly any more, the problem with the lcd tv's when run directly on a battery is the invertor for the cold cathode tube blacklight, that is the biggest power draw in the tv, and the power supply is running near it's limits normaly due to using the cheapest components they can get away with, all the components are specced to take 12.3 volts and hardly a few millivolts more,

    so what happens is people cut the lead coming from the mains power brick, put a fag lighter plug on the end, and pat them selves on the back for saving 40 quid on a power conditioner,
    they use the tv in the van when off shore power, and all is well, then one day they get a site with shore power, the charger is in boost mode putting upto 14.8 volts into the battery to charge it properly, and the Tv gets that 14.8 volts too, or they start the engine and a noisey spikey 14 + volts goes to the Tv,

    the backlight inverter overheats and goes pop, and you get a black screen, the picture is still there, but can't be seen as it's got no light source now,
    some TV's backlight invertors go pop the first time they get overvoltage, some take a fair while of abuse before they finaly go, and yes some tv's do seem to last forever on overvoltage, but as the price of lcd tv's keeps dropping, so the parts in them have to be cheaper,

    try to take the tv back for warrenty repair, and as soon as they see the overloaded and blown components in the backlight invertor section, they'll reject the claim, as they are wise to the caravanners/motorhomers/boaters who run them directly off the battery nowadays,

    Older TV's and electrical items like laptops, dvd players etc could take the extra power of a charging battery, as they used components that had a nice tollerance of the voltage, this was because back then they used transformer based power supplies, in which the output would fluctuate with the input fluctuations,

    but nowadays with switched mode psu's, they can guarentee to get an exact voltage out of it at all times, if the input is 90 or 250 volts, it'll always be 12.3 volts out (that's the most common lcd TV input voltage)

    the 12 volt power conditioner is 40 quid, but how much is a new tv? and when you buy a new tv in a few years time, you keep the power conitioner to run that, and you can power a sky box (if you have a pace javelin 12 volt box) dvd player etc off it too and be safe in the knowlage it'll not add noise that amps can pick up, and keep the items running within spec.
     
  14. Kon tiki

    Kon tiki Read Only Funster

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    Good explanation :thumb: I have run my cheap Tesco TV direct from the battery but only if the voltage was below 13 volts but appreciate it is risking blowing it but it's a few years old & the remote no longer works. Keep toying with the idea of getting a proper 12 volt TV or going the route of the voltage stabilizer then looking for a cheap TV. I have noticed that there are more of the small TV's that don't have the seperate power supply now & the 240 volt cable connects to the TV so not making it possible to use 12 volts :Blush:
     
  15. New Rover

    New Rover Read Only Funster

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    So, to get this straight;
    To run the TV from the leisure battery supply, I would need to make up a lead using a 2 pin Caravan type plug to a cigarette lighter socket, then buy the appropriate Amperor stabiliser/regulator (with a possible adapter) utilising its cigarette plug to the TV plug.
    If I want to run the TV from the vehicle battery then I would just use the Amperor cable but with an extension cable because of increased distance (TV at ear of van).
    Would there be any large voltage drop in extension cable or would it cope?

    gazznsam, could you tell me where to buy the item that has an 8 Amp capability?
     
  16. runrig

    runrig Funster Life Member

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    Hi
    We have a box & lead that stops the power surging into your tv, we no longer need it, so if it is what pappajohn is talking about please let us know, Mick knows more about it than me, but hes still at work.

    Sheila (runrig)
     
  17. markymark

    markymark Read Only Funster

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    Thanks papajohn i didnt see that plug there:thumb: It had been a long day:Rofl1:
     
  18. sinbad1

    sinbad1 Deleted User

    Seems to be some confusion

    Perhaps a simple way of looking at this

    the supply can be via cigarette lighter /caravan plug /direct to the battery,etc

    the imput plug to the tv will need to be matched to the input socket on the tv (polarity needs to be checked)


    simple way not recommended(voltage variation no fuse protection)

    battery +....................................................... tv 12v
    -................................................................... imput

    better(voltage variation fuse prtected)

    battery +..........inline fuse................................. tv 12v
    -..................................................................... imput

    recomended(voltage protection fuse protected)

    battery + .........inline fuse.........voltage reg............... tv 12v
    - .............................................unit ........................ imput


    Regards
     
    Last edited by a moderator: May 19, 2009
  19. New Rover

    New Rover Read Only Funster

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    I've already made up a lead to run Tv from 12v Skt in van.
    To add protection for 12V regulation, I have to buy pappajohn's recommended piece of kit.
    Unfortunately these come with a cigarette plug/skt configuration. Now it is no hardship to remove said cigarette plug/skt and attach the 2 pin plug to fit existing skt in van. The only problem is by removing the cigarette lighter plug/skt you invalidate any warranty you have for the regulator in the first place.
    Hence my idea of leaving the piece of kit as is, and making up a 2 pin plug to cigarette plug/skt to fit to regulator connection.
     
  20. pappajohn

    pappajohn Funster Life Member

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    not only the warranty......you will remove the fuse protection as well. its in the plug.:Doh:
    2 pin to cig lighter skt is the best route but not very pretty.:Sad:

    there are other regulators about but i have the amperor and would recommend it.:thumb:
     
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