Longterm EHU

Discussion in 'Motorhome Chat' started by tony_g, Nov 24, 2011.

  1. tony_g

    tony_g Funster

    Joined:
    Aug 29, 2010
    Messages:
    404
    Location:
    Nuneaton,some of the time
    Ratings:
    +226
    I have a fairly basic question, which I suspect will have an answer dependent on van type. But here goes. I am off to Oz and NZ next week for 11 weeks. The van is already drained down, upholstery and mattress indoors, crystal thingies sitting in large plastic bowls etc. etc.
    Can I safely leave it on EHU for the whole time, as the alarm is likely to completely drain the battery before I return? Not only a pain but invalidates the insurance.

    My Burstner is on a Transit base and the manual seems to suggest that the Electroblok transformer/rectifier is able to 'sense' the state of the battery but is not exactly clear; and I guess this is not dissimilar to parking up at Zahora for a prolonged stay. But am I missing something? :Confused::Confused::Confused:
     
  2. slobadoberbob

    slobadoberbob

    Joined:
    Jun 1, 2009
    Messages:
    6,159
    Location:
    Kent, garden of England
    Ratings:
    +1,971
    I leave mine on for 6 months

    I leave mine on for 6 months over the winter.. no problems.

    Bob
     
  3. Craig Rogers

    Craig Rogers

    Joined:
    Nov 9, 2011
    Messages:
    651
    Location:
    Midlands, UK (Welsh!)
    Ratings:
    +412
    Do you mean the Cab alarm? It's possible that EHU won't charge your cab battery but will have a connection to monitor the state of it for displaying on your control panel.

    11 weeks shouldn't really drain a good cab battery.

    Although it's winter, have you thought about a small solar panel that plugs into the Ciggy lighter. That will help try and put back in what the alarm/immobiliser is taking out.
     
  4. hilldweller

    hilldweller Funster Life Member

    Joined:
    Dec 5, 2008
    Messages:
    28,624
    Location:
    Macclesfield
    Ratings:
    +34,224
    The load imposed by some modern electronics and drain a better in under a month.
     
  5. tony_g

    tony_g Funster

    Joined:
    Aug 29, 2010
    Messages:
    404
    Location:
    Nuneaton,some of the time
    Ratings:
    +226
    Yes, mine shows a noticeable drop after two weeks.
     
  6. sedge

    sedge Funster

    Joined:
    Jul 7, 2009
    Messages:
    4,772
    Location:
    Nr Jct 3 M6
    Ratings:
    +5,504
    Could you stick the house end of the EHU on a timer. to come on for X hours a day/night or something?
     
    • Like it Like it x 1
  7. Craig Rogers

    Craig Rogers

    Joined:
    Nov 9, 2011
    Messages:
    651
    Location:
    Midlands, UK (Welsh!)
    Ratings:
    +412
    That's only good if the charger gives power to the Cab battery
     
  8. tony_g

    tony_g Funster

    Joined:
    Aug 29, 2010
    Messages:
    404
    Location:
    Nuneaton,some of the time
    Ratings:
    +226
    In my case the EHU does do both batteries and I have used a small Maplins solar panel on the dash but wouldn't want to rely on it. I don't really know how long the starter battery would last but would prefer not to find out the hard way! ::bigsmile:::bigsmile:::bigsmile:
     
  9. tony_g

    tony_g Funster

    Joined:
    Aug 29, 2010
    Messages:
    404
    Location:
    Nuneaton,some of the time
    Ratings:
    +226
    Good thought. Ideally I'd like a timer programme something like 20 hours every 14 days!::bigsmile:
     
  10. welsh winger

    welsh winger

    Joined:
    Jul 7, 2009
    Messages:
    231
    Location:
    Sunny Swansea
    Ratings:
    +58

    In that case plug a charger in motor home to charge the cab battery and jobs a good un.

    Nick
     
  11. Craig Rogers

    Craig Rogers

    Joined:
    Nov 9, 2011
    Messages:
    651
    Location:
    Midlands, UK (Welsh!)
    Ratings:
    +412
    Yeah it is a good thought...... Although, it would probably have to be every 7 days, not come across a 14 day timer before, but 7 day timers are widely available.

    Sunday could be the new charging day! I have a Commando EHU stepped down to 13amps via fused spur, thinking getting one of these now to replace the fused spur.

    http://www.discount-electrical.co.u...h-up-to-28-on-and-off-programmes-per-week-13a
     
  12. hilldweller

    hilldweller Funster Life Member

    Joined:
    Dec 5, 2008
    Messages:
    28,624
    Location:
    Macclesfield
    Ratings:
    +34,224
    That would cause problems with our "intelligent" charger. Every 5 ( or something ) connections it performs a high voltage boost charge. Probably harmless but I just leave it on all the time.
     
  13. pappajohn

    pappajohn Funster Life Member

    Joined:
    Aug 26, 2007
    Messages:
    31,251
    Location:
    YO11 2BD
    Ratings:
    +23,546
    Why 20 hrs every 14 days ?

    just program the timer for 1/2hr or 1hr per day......even a cheap mechanical 24hr timer would suffice then
     
  14. Craig Rogers

    Craig Rogers

    Joined:
    Nov 9, 2011
    Messages:
    651
    Location:
    Midlands, UK (Welsh!)
    Ratings:
    +412
    That's another intersting point, our Chausson is fitted with a CBE 4 Stage charger and referring to the manual;

    The charging system is carried out in 4 stages:
    1) battery charging with maximum current until the end-charge voltage is reached:
    Note: the end-charge voltage is reached only if the battery is efficient.
    2) when the end-charge threshold is reached the charger continues to operate for 90 minutes (lead
    batteries) or 8 hours (gel batteries) with constant voltage.
    3) Constant voltage holding 13.8V (gel batteries) or 13.5V (lead batteries)
    4) After 10 hours, the battery charger reaches the standby mode and begins to operate again only
    when the battery voltage is lower than 13V



    Which would make a timer pointless, therefore, it seems fine to just leave on EHU constantly.
     
    Last edited: Nov 24, 2011
  15. pappajohn

    pappajohn Funster Life Member

    Joined:
    Aug 26, 2007
    Messages:
    31,251
    Location:
    YO11 2BD
    Ratings:
    +23,546
    Agreed, if you have a multi stage charger, but not all vans do :thumb:
     
  16. Craig Rogers

    Craig Rogers

    Joined:
    Nov 9, 2011
    Messages:
    651
    Location:
    Midlands, UK (Welsh!)
    Ratings:
    +412
    It makes sense as to why sometimes, the control panel (of course if it's that acurate) is not always showing a fully charged leisure battery, sometimes, the very top led on the scale isn't lit. Use some lights for a while and it actually goes up :roflmto:

    Probably because the charger has kicked back in. Clever sh!t
     
  17. dave newell lvs

    dave newell lvs Trader-Vehicle Services

    Joined:
    Oct 31, 2008
    Messages:
    2,789
    Location:
    Telford, Shropshire
    Ratings:
    +4,318
    Leaving your van on hookup for 11 weeks will do no harm as the Schaudt Elektrblock is an "intelligent" charger and yes it will maintain the engine battery too.

    D.
     
    • Like it Like it x 2
  18. tony_g

    tony_g Funster

    Joined:
    Aug 29, 2010
    Messages:
    404
    Location:
    Nuneaton,some of the time
    Ratings:
    +226
    Bingo! Sounds like the definitive answer to me. Many thanks.
    :thumb::thumb::thumb::thumb::thumb:
     
  19. motorhomelover

    motorhomelover Banned

    Joined:
    Jul 28, 2010
    Messages:
    1,719
    Location:
    The world
    Ratings:
    +616
    lucky b****rd 11 weeks away i feel sick now :Eeek:
     
  20. ronboyracer

    ronboyracer

    Joined:
    Nov 18, 2011
    Messages:
    37
    Location:
    cheshire
    Ratings:
    +9
    EHU

    Ronboyracer, I agree with one idea put forward, put a timer between the hook up and the main supply, a couple of hours a day should do it.
     
Loading...

Share This Page