12v tv on hookup

Discussion in 'Tech/Mech General' started by walnut, Feb 19, 2010.

  1. walnut

    walnut Read Only Funster

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    I have used the search but couldn't find the answer.

    I have a 20in TV that runs of 12volts direct or mains using an external psu.
    When on hookup is it better to use the motorhomes 12v connection or use tv's psu plugged in to 240v socket?
    When on hookup are the 12v sockets supplied by the battery, battery charger or other?
     
  2. dave newell lvs

    dave newell lvs Trader-Vehicle Services

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    As long as your battery charger/PSU is switched on then when on hookup you can run your TV from either. If plugged directly into 240V socket then obviously its running directly from EHU, if plugged into 12V socket then TV takes power from battery which is then replenished by charger/PSU, result=TV works from either source with no significant difference. Personally I'd always run it from 12V (assuming it is designed for leisure vehicle use and has voltage stabilisation built in, if not then use a stabiliser from amperor) and then you don't need to carry the PSU.

    D.
     
  3. AuldCodger

    AuldCodger Read Only Funster

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    Have always run on 12v, see no point in changing back and forth.
    If you are on ehu does it matter where the the power is coming from?
    Someone will be along very soon to tell me why.
    :thumb:
     
  4. Hayleylulu

    Hayleylulu

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    we always run tv on 12v
     
  5. hilldweller

    hilldweller Funster Life Member

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    That would depend on your van.

    Our cab sockets are on the starter battery and switched with ignition, our hab sockets on the leisure battery. Both batteries are charged on hookup. It's a Burstner.

    You could be completely different - what make is it ?
     
  6. pappajohn

    pappajohn Funster Life Member

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    12v sockets are powered by the battery which is charged from ther charger when on hookup.

    some chargers can be used as a power suppy without a battery in circuit so in that case the sockets will be charger powered.
     
  7. walnut

    walnut Read Only Funster

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    Thanks for the advice, the van is a Bessacar e495.
    Been out in the van for a couple of nights too give it an airing.
    I have 2 x leisures that I took out of the van in October, after a couple of hours on hook up the charger had dropped from 14.4v to 13.8 and was only pumping in 0.35Amps, batteries must be fully charged.

    Every time we have been out before the batteries must of been flat because it would take days to charge them, control panel would show 14.4v aprox 3amps running into batteries.

    When putting the van in storage, from now on I will take the 40amp battery fuse out to stop batteries getting drained.

    Will try the TV on 12v next time and see which way the control panel says the current is running. Hopefully it will show 0.35amp plus the TV drain say 3amps.
     
  8. wireman

    wireman Read Only Funster

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    Ours is run from the leisure batteries on 12v even on EH and I think its a good idea since batteries last a lot longer if they are used and recharged regulary rather than the usual use em till nearley flat and recharge cycle; hence our getting a solar panel to do the job in the summer.
     
  9. Terry

    Terry Funster

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    try this to explain
    terry
     

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  10. scotjimland

    scotjimland Funster Life Member

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    Sorry, but I have to disagree about using and recharging.

    Exercising doesn't improve life, a battery depreciates with every cycle, keeping it fully charged and not using will maximise it's life .. preferably with multi-stage intelligent charger.

    I agree that using it till it's almost dead will end it's life prematurely .. may even kill it, to maximise the life of a battery it should never be discharged more than 50% .. see chart for voltages.
    A solar panel will indeed aid to maintain the battery provided it has a proper charge controller .


    [​IMG]
     
  11. hilldweller

    hilldweller Funster Life Member

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    Are you kicking yourself yet :Wink:
     
  12. scotjimland

    scotjimland Funster Life Member

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    If you have something to say Brian I'd love to hear , always willing to learn

    .. I'm not a mind reader
     
  13. hilldweller

    hilldweller Funster Life Member

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    ========================
    I think its a good idea since batteries last a lot longer if they are used and recharged regulary rather than the usual use em till nearley flat and recharge cycle; hence our getting a solar panel to do the job in the summer.
    ========================

    If you had extended your red text you might have noticed you have just said what Tony said.

    Simples.
     
  14. scotjimland

    scotjimland Funster Life Member

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    Indeed, but it was with reference to using a TV on 12v , or any other 12v appliance, Is it not better to use the mains ( if possible) rather than to cycle the battery .. ?

    That's my opinion .. and what I've always practised , my batteries are six years old ( el cheapo FLAs ) and still performing well, and they were in constant use for three years , so I must be doing something right, but then again I do have a proper 70A Victron charger and a Honda genny to keep them in tip top shape..
     
  15. hilldweller

    hilldweller Funster Life Member

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    I think we all close together here. Tony is saying don't deep discharge and you are saying don't discharge. When it comes to hook up and a TV load this will be supplied by the charger anyway, the battery won't dip measurably.

    My batteries are six and a bit. I can't understand why folk seem to be replacing them at 2 years, just neglect I guess aided and abetted by CANBUS drainage.
     
  16. walnut

    walnut Read Only Funster

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    So it's probably best not to drain the batteries while on hook up.
    Keeping the batteries fully charged prolongs their life.
    The question now is when on hookup do the batteries supply the 12v power or the battery charger?
    Technician at Discover leisure said it was better to use 12v supply all the time.

    Next time I'm in the van I will check the control panel at see which way the current is running.

    I think a solar panel is a must, keeps the batteries charged while in storage, not lucky enough to be able to keep my van at home.

    Thanks for the help.
     
  17. walnut

    walnut Read Only Funster

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    I think this is because the leisure batteries are being drained when the Van is not in use.
    Discover fitted a gas detector straight across the leisure battery on my Van, 2 wks in storage and my batteries where flat.

    Now thinking of fitting a battery cut off key so I can easily disconnect them.
     
  18. wireman

    wireman Read Only Funster

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    My batteries have stuff wired directly accross them too. BUT the van gets used at least three times a week on journeys long enough to replenish the batteries on eof which is now 5 years old (added the other (and yes its a matching one) last year to give us a bit more time before we need to top up with a EHU. Won't use a genny because they kill the Calira charger unit supplied on thye Knaus as does too much time spent on a EHU to be honest. We tend to move every day or two at most so the 170 amps we have in theory (85 in practise) lasts us a long while and once the solar panel goes on I shall rest even easier.

    Actually I am a great beleiver that excersising the batteries adds to their useful life span. I have fitted brand new batteries to motorcycles that were in use regulary and had no problems till we fitted a cheap battery tender which promptly killed them. I am not talking about regulary taking them to 40% of their capacity but just using them correctly with a flow of electrons through them that is hopefully balanced i.e power in = power out.
     
  19. kennygd

    kennygd Read Only Funster

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    EHU CONFUSED ! Being brand new to all this, and old, well 64 anyway, when plugged in to EHU is the power going straight to the leisure batteries to keep them topped up and everything still working at 12V in the van or when plugged in to the EHU is everything in the van switched over to 230/240V, I am not picking up my Arapaho until March so I need to get as much information as possible and everyone has been great.
    Thanks
    Kennygd:thumb:
     
  20. oldun

    oldun Read Only Funster

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    There are two problems with 12V.

    With the charger on the voltage will be around 14V. Most 12V units can cope with this voltage but a few may not. The very expensive TV etc made specially for the leisure industry will cope OK. Other cheaper units may not but I have never heard of any actually failing.

    With the charger off and the battery low there may be insufficient voltage to run the unit.
     
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