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  1. #11
    Join Date
    Mar 2009
    Location
    UK, Hamble
    Posts
    603

    Default Re: Battery charger - how much shore power to keep charged

    Are the battery switches off? Are you sure the fridge has not been left running?

  2. #12
    Join Date
    Dec 2003
    Posts
    5,698

    Default Re: Battery charger - how much shore power to keep charged

    Irish Rover,
    Does the 240V mains charger have an integral ammeter? Or do you have any other way of verifying what 12V is going into the batts, or potentially elsewhere? And you’re sure there is nothing else running off the mains a/c, dehumidifier, engine heater, etc.?

  3. #13
    Join Date
    Dec 2003
    Posts
    5,698

    Default Re: Battery charger - how much shore power to keep charged

    Quote Originally Posted by macd View Post
    What he said, Rover.
    I'm also still a little suspicious about the meter readings. There surely must be some units marked on the meter. Could you take a photo for us?
    +1, a scaling error of 10 or even 100 crossed my mind too.

  4. #14
    Join Date
    Feb 2017
    Location
    Türkiye
    Posts
    1,705

    Default Re: Battery charger - how much shore power to keep charged

    Thanks all. Will go to this boat later and try to figüre this out. May well be I'm interpreting the numbers on the meter incorrectly.

  5. #15
    Join Date
    Sep 2017
    Posts
    2,069

    Default Re: Battery charger - how much shore power to keep charged

    I have known a metermaid to clock-up units x 10 resulting in a very high bill

  6. #16
    Join Date
    Jun 2013
    Location
    Hopefully somewhere warm
    Posts
    9,826

    Default Re: Battery charger - how much shore power to keep charged

    What a perfect excuse to treat yourself to a clamp meter
    https://www.amazon.co.uk/s?k=dc+clamp+meter

  7. #17
    Join Date
    Mar 2010
    Location
    Ammersee, Bavaria
    Posts
    5,615

    Default Re: Battery charger - how much shore power to keep charged

    1.5 kWh would run my boat with fridge and everything else for about 2 days. Something is not right - he's not got a jammed float switch and a permanently running bilge pump has he? They are usually the only thing permanently live - more so on a wooden boat.
    The best argument against democracy is a five-minute conversation with the average voter.

  8. #18
    Join Date
    Feb 2017
    Location
    Türkiye
    Posts
    1,705

    Default Re: Battery charger - how much shore power to keep charged

    OK so I've had a look. 3 batteries present - 2 x 225ah Varta and 1 x much smaller battery which I can't get a good look at but from the size is probably a 90 or 100ah engine start battery. All look fine and not hot to the touch when the charger is on. I took a photo of the charger but can't seem to post from my phone but this is it from google
    VL-169.jpg
    I'm going to the marina office to ask about the meter units and will report later.

  9. #19
    Join Date
    Feb 2017
    Location
    Türkiye
    Posts
    1,705

    Default Re: Battery charger - how much shore power to keep charged

    Further to my post above I called the marina electrician to the boat. He confirmed the units on the meter are a tenth of a Kw so the 15 per day it's using = 1.5Kw. He didn't seem to think the usage was unusual but he wouldn't, would he. I've disconnected the shore power at the meter and taken a reading so will check again tomorrow. If the reading is still the same then I guess the problem is most likely on the boat and I'll advise my pal to get a proper electrician to check it out.

  10. #20
    Join Date
    Feb 2008
    Location
    Farndon
    Posts
    3,165

    Default Re: Battery charger - how much shore power to keep charged

    I do leave my battery charger on and can safely say it should consume hardly anything.
    1.5 units is about 25pence per day or thereabouts . Not huge but perhaps fridge has been left on?
    Has a frost protection heater not been put in the engine bay ? if so it might have cut in in recent nights if on a thermostat? Perhaps frost in your area is not a risk?

    Starting the engine every few weeks also seems to me unnecessary and possibly detrimental …………but each to his own,.

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