question on webasto rh100

Discussion in 'Motorhome Chat' started by Daz n Tina, Sep 5, 2014.

  1. Daz n Tina

    Daz n Tina Funster

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    hi all , just some advice really, I have a webasto water and warm air heater which is being serviced. I have 2 x 95 amp varta batteries (auxillary) does anybody have problems running it of batteries alone?
     
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  2. scotjimland

    scotjimland Funster Life Member

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    With 2 x 95ah you have 95ah useful power before you effectively flatten the batteries. ( 50% of the capacity)

    check the label of your heater , what amps does it use.. that will determine how long the batteries will last..

    for example , if it says 2 amps, you will have about 50 hrs , that's not including other uses such as lighting, water pump etc.. so allowing for them maybe 30 - 40 hours.. to be on the safe side let's say 24hours .

    but as I said.. check your heater label.. then decide if that is a problem..
     
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  3. Daz n Tina

    Daz n Tina Funster

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    thank you for your reply jim, my question was really aimed at funsters who have one but I will check the amps as this is useful information. I have had problems with mine starting up numerous flashes warning of low power when I know the batteries are fully charged. I.e new batteries and been on hook up for a couple of days. And also numerous warning flashes to say fan problems etc
     
  4. PhilandMena

    PhilandMena Funster

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    I have one ! Whilst the unit user a few amps to (about 4-5 ) to heat the glow plug on start up, It's pretty much self sustaining after that.
    If your getting numerous flashes with fully charged batteries you have a problem and need to decipher the flashing code which is in the user manual.
    I would advise calling Webasto and they will confirm how much drain is taken from the battery on start up and may advise on the flashing you are witnessing.

    I've had mine now for 3.1/2 years , have never had it serviced and it's quiet as a kitten and a superb bit of kit. I run in for a minimum of 1 hour per month to keep everything in good working order.

    I have never had a problem with running from the batteries alone, which I do quite often.
     
  5. scotjimland

    scotjimland Funster Life Member

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    I thought the OP's model had a blown air fan .. that uses about 2 amps..

    my mistake..
     
  6. Allegro83

    Allegro83 Read Only Funster

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    We had the Webasto Dualtop in our previous Motorhome and had no problem running heating/hot water when not on hook up. We had 2x110 ah batteries and 2x 80 solar panels.
    If an error code is flashing up the book is very good. Only problem we had was sticking dump valve which was replaced under warranty. Oh and a 10 amp fuse went, they have to be taken out in a certain order and replaced in specific order again the instructions help.
     
  7. Daz n Tina

    Daz n Tina Funster

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    thank you all for the info. It is with the motorhome workshop at the moment to be sorted, it was just that prior to our new van I had a self build with a propex heater and I could park up for at least 4 days and everything was fine working of one 110 amp battery but the Malaga water heater was gas. We rarely use ehu and I am hoping the new van will be the same. By going by your comments I should not have a problem.
     
  8. scotjimland

    scotjimland Funster Life Member

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    Last edited: Sep 5, 2014
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  9. Daz n Tina

    Daz n Tina Funster

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    thank you scot it is a RHA100
     
  10. scotjimland

    scotjimland Funster Life Member

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    you're welcome..

    back to your amps.. just be aware, according to the manual, it uses 7 amps blowing hot air.. seems a lot .. but that's what it says.
     
  11. jonandshell

    jonandshell Funster

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    As long as your batteries are in good nick, it'll be fine.

    Ours will run for 4 days at -5 to -20 degrees outside whilst maintaining 20 degrees inside the van.

    Our battery bank is 345 Ah.
     
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  12. jonandshell

    jonandshell Funster

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    It was already there Jim!

    I put one in there ages ago! Na Nana nah nah!!!!!!:laughing:
     
  13. jonandshell

    jonandshell Funster

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    Actually, its gone!!!!!

    I curse that Jim Brown and his new website!!!!

    Good work Jim (Scotjimlamd)!!!!!!!!!!
     
  14. jonandshell

    jonandshell Funster

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    Hi Jim

    That is an absolute peak current in my experience. The glowplug is the culprit there.
    I reckon in normal UK winter use, an average of 2 amps is good for battery endurance guesstimation.
     
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  15. scotjimland

    scotjimland Funster Life Member

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    thanks.. so my first guess was close to the mark.. cheers
     
  16. jonandshell

    jonandshell Funster

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    Our average draw during a ski trip for all our 12 volt system is about 4 amps.
    The dualtop is quite advanced compared to earlier diesel heaters in that it ticks over using very low quantities of current and fuel rather than continually shutting down and restarting.
    The restart is what places the highest demand on the battery due to the glowplug being powered up.
    The fuel dosing pump, burner fan and circulation fan use very little current during continual use.
     
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  17. Ed Excel

    Ed Excel Funster

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    Why don't you turn the Webasto on when you start your journey? It's diesel you can run it whilst on the move. It's a central heating system. Ours goes on before we turn a wheel and off when we get home.
     
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  18. jonandshell

    jonandshell Funster

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    Exactly the way we use ours!
     
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  19. Daz n Tina

    Daz n Tina Funster

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    when travelling which settings do you have it on? Mine has water 40 and 70 deg and winter mode heating or heating and water. Or can you have it on any setting?
     
  20. Ed Excel

    Ed Excel Funster

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    Summer: hot water.
    Winter: heating & hot water.
    We use the water 40C setting for the sink and the 70C for showers. So it's usually on 40 until we want a shower.
     
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