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Running Wet Webasto Overnight in Corsa B 1.5 TD: Battery Requirements, Fuel Consumption & Models

zbyszek_k007 54216 17
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Can a wet Webasto parking heater run overnight in a Corsa B 1.5 TD without draining the battery, and what battery size or heater model is suitable?

A wet Webasto is a poor choice for overnight cabin heating on a single battery, because it heats the coolant and still needs the car’s fan and circulation pump to warm the interior, so the electrical draw is significantly higher than for a dry heater [#12964550][#12964318] One poster cites a Webasto Termo Top C (5 kW) at about 40 W, with the blower adding more, and says the whole setup can reach about 5 A maximum [#12964585] Another estimate was about 45 W ≈ 4 A, so 8 hours would use roughly 32 Ah; in that view a 72 Ah battery is the minimum, but only if it is truly healthy [#12964338][#12964399] For safety, several replies recommend a second battery in the trunk with cables/relay so the car can still be started in an emergency [#12964399][#12964412] If you only need preheating, one suggestion was to program the heater 10–20 minutes before driving instead of running it all night, and if you really want to sleep in the car, a dry heater was recommended instead [#12964320][#12967967]
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  • #1 12964297
    zbyszek_k007
    Level 13  
    Posts: 116
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    Hello, I have this question. I would like to install a webasto parking heater in my car. I was thinking about wet webasto, because from what I heard it consumes similar amounts of fuel and there is no need to install air supply pipes, and I have a small car (Corsa B 1.5 TD). This is where my question arises: can I use webasto for a few hours or overnight? Will it drain my battery? What battery would be needed to pull this for example for 8 hours (how many Ah). I thought about moving the battery to the trunk, because you know, it's always warmer, that is, it lasts longer ... And can the webasto be regulated, for example, so that the temperature in the car is 18 degrees? How much oil will such a webasto consume? What model do you recommend?
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  • #2 12964318
    Przemo9826
    VIP Meritorious for electroda.pl  
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    The wet webasto heats the coolant, if you would like to have heat inside, you still have to turn on the fan, and this consumes a lot more electricity. Tell me, what devilish idea did you come up with with this heating, what do you expect?
  • #3 12964320
    wiesiek3d
    Level 29  
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    Why stay all night long.
    You program the controller 10 - 20 minutes before the ride, and you have a warm engine and interior.
  • #4 12964330
    albert.pracz
    Level 10  
    Posts: 49
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    Maybe he is moving out of the house in favor of the car :) I think an ordinary battery may not be able to take it.
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  • #5 12964331
    Błażej
    VIP Meritorious for electroda.pl  
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    Do you live in the car?
  • #6 12964338
    zbyszek_k007
    Level 13  
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    I go fishing more than once and I have slept in the car more than once. You do not know how much more or less such a fan pulls in the lowest gear? It doesn't make sense at the higher level, because it's too loud.

    My calculations show that if the webasto pulls, for example, 45 watts, it will be about 4 amps at 12 volts. 8 hours and we have 32 ampere hours. If the battery has 72 Ah, it should be ok ...
  • #7 12964352
    Przemo9826
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    I could never understand anglers ...
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  • #9 12964399
    Przemo9826
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    These 72Ah are the absolute minimum, but so that I could sleep well, I would put another battery and cables in the trunk to fire the car in an emergency.
  • #10 12964412
    zbyszek_k007
    Level 13  
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    Haha, Przemo9826 I don't understand some things either, but never mind :D I edited the post above: "My calculations show that if the webasto pulls, for example, 45 watts, it will be about 4 amps at 12 V. 8 hours and we have 32 ampere hours. If the battery has 72 Ah then it should be ok ..." I will add that I saw such powers on stoves with built-in pumps ... If I'm wrong, make me wrong. Oh, and thanks for these topics. I couldn't find them ...

    Edit: Przemo9826 also thought about the second battery and I do not exclude it.
  • #11 12964448
    Przemo9826
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    Are you going fishing? Do you sleep 8 hours in the car? :D

    You count the stove itself, add the fan, I hope that it will also pull with 5A, without it you will only have the liquid heated.

    And this battery must have the minimum 72Ah, not only on the sticker ...

    A party worth these fish? The stove costs its own, a new battery of such capacity too ...
  • #12 12964530
    zbyszek_k007
    Level 13  
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    Well, this is how much sleep takes on average. If you look for it well, you can buy a stove with all the junk for about 1000 PLN. "The maximum power consumption is 34 watts (slightly more than the two blinker bulbs), correspondingly less in the lower gears." a quote from

    https://www.elektroda.pl/rtvforum/topic1169538.html

    The whole thing will definitely not exceed 5 A (unless at start-up). In addition, from what I know, when the stove heats up and works half-heartedly, the power drops by another 10 W ...
  • #13 12964550
    Błażej
    VIP Meritorious for electroda.pl  
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    But this result was given for the dry webast which heats the cabin air. You want wet, that is, you still get a fan in the car, even in the lowest gear, and a fluid circulation pump. And that's a lot more electricity.
  • #14 12964585
    zbyszek_k007
    Level 13  
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    The furnace itself, used as a 5 kW auxiliary heater, draws 26 W. Webasto Termo Top C has 5 kW of heating power and consumes 40 W (it has an integrated liquid and fuel pump). And the blower should be added to 40 W, and in the lowest gear I hope that it will be about 10 W. During operation, everything will consume a maximum of 5 A.
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  • #15 12967801
    zibi581
    Level 22  
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    And all this in a small chest, and somewhere to fish :cry:
  • #16 12967828
    Przemo9826
    VIP Meritorious for electroda.pl  
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    zibi581 wrote:
    and where is the place to fish


    How is it where? In the water.
  • #17 12967967
    T5
    Admin of Cars group  
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    To sleep, buy dry. There is no point in heating the engine block - heat loss. In addition, a second battery in the trunk with a relay disconnecting charging. It will be warm and the car will start.
    Go ahead
    Przemo9826 wrote:
    and where is the place to fish


    How is it where? In the water.
    Take a spinning rod in your hand and go hunting. And you'll see that a cool thing like a little 60 is fighting.
  • #18 12983347
    zbyszek_k007
    Level 13  
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    Thanks to everyone for the answers. From now on, I am collecting dry ... If you have any more advice, please write.
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Topic summary

✨ The discussion revolves around the installation and operation of a wet Webasto parking heater in a Corsa B 1.5 TD. Users express concerns about battery requirements for prolonged use, particularly overnight. It is noted that the wet Webasto heats coolant, necessitating a fan for interior heating, which increases electricity consumption. Calculations suggest that a 72 Ah battery is the minimum requirement for approximately 8 hours of operation, with some users recommending a second battery for safety. The power consumption of the Webasto unit is debated, with estimates ranging from 34 to 45 watts, and the importance of considering the fan's power draw is emphasized. Users also discuss the practicality of using a wet heater versus a dry heater, with some advocating for the latter to avoid unnecessary engine heating and heat loss.
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