EHU, most economical way?

Discussion in 'Tech/Mech General' started by Glandwr, Aug 20, 2014.

  1. Glandwr

    Glandwr Funster

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    Just come back from a week and I was going through the motions one of which is putting the MH on hookup so as to keep fully charged.



    I got to thinking, would it be more economical to fit a 7 day or longer timer and have it on intermittently rather than constantly. Anyone do that? What are your time intervals?



    Dick
     
  2. Wildbill

    Wildbill Funster

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    2 hrs. day would do it the battery's would not have hat any thing drawn from them
    I am sure that some one will be along to shoot me down in flames
     
  3. GJH

    GJH Funster Life Member

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    Most of the year the solar panel keeps both the habitation and starter batteries topped up. When we use the van I normally put the EHU on the day before to cool the fridge down and that deals with any solar shortfall. If other commitments prevent us from using the van for a few weeks in winter then putting the EHU on for a day now and again tops the batteries up. No need to do it more frequently.
     
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  4. Inthezone

    Inthezone Read Only Funster

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    Do you have a solar panel?, if you do would it be better to have the mains on only ovenight for a few hours as Bill suggested and let the pannel do its work during daylight hours
     
  5. Puddleduck

    Puddleduck Funster

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    Forgive the ignorance but if the van isn't being used and you have a solar panel why do you need EHU overnight? The solar should keep the batteries topped up, shouldn't they (unless there isn't enough light of course)?
     
  6. phase3begins

    phase3begins Read Only Funster

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    Agree Puddleduck.
     
  7. Kool Kroozer

    Kool Kroozer Funster

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    We have left our fridge on for about 10 days (the longest time) while in storage, the solar panel has supplied it without any problems, and with a battery master fitted also we have never had any problems with starting the engine either !
    PS: We was never aware that the fridge was "ON" at the time, (it must have been on for a few months while in storage) was always made to think that if the leisure battery control panel was turned "OFF" that all the on board electrics was "OFF" also - if you do not have any solar power its well worth investing in (y)
     
  8. tonka

    tonka Funster Life Member

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    Getting back the original question and putting solar panels aside..
    I dont think there is any point of a timer at all, the on board charger will only operate when the batteries need charging, so in therory once the initial charge is complete it will turnoff or go on a very low trickle when it needs it. ie if something puts a draw on the battery..
    Am I right ????

    Then again... Have my 80w solar panel and it keeps everything charged up and never plugged in at home in 2 years since fitting !!!! :)
     
  9. Snowbird

    Snowbird Funster Life Member

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    The only time I plug in is on long stays on campsites where am charged for electric. If you have solar, then as long as there is no snow on them they should keep on top of any battery drain.
     
  10. Ed Excel

    Ed Excel Funster

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    Think the OP needs to determine the quality of his battery charger, ie, is it intelligent enough not to boil the battery. With staged charging permanent connection should be fine. Killing a battery will probably cost more than the electricity used to do it.
     
  11. Glandwr

    Glandwr Funster

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    Many thanks for all your contributions
     
  12. oldun

    oldun Read Only Funster

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    A rather sweeping statement. can your battery system cover air con, tvs, DVDs, computers, hair dryers, hair straighteners and a wide range of other equipment which some seem so keen on using?

    These people struggle on 16 amps so no way could s solar panel array produce adequate power.
     
  13. Snowbird

    Snowbird Funster Life Member

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    I take it you did not read the OP. Why would the OP want to run that lot if his van was in storage ?. But in answer to your question, YES it can.
     
  14. joner8888

    joner8888 Read Only Funster

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    Off track a little--
    While on a site last week i noticed a full season pitch owner next to me in a caravan packing up for the end of his weekend stay.
    He came out to the EHU terminal and swapped back in the companies RCD and took his own (probably higher rated) back out !
    They seemed to just slot in and out.
    Got me thinking !!:D
     
  15. Munchie

    Munchie Funster Life Member

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    Is this not very dangerous if your van wiring is only rated at 16amp?
     
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