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Thread: Flat battery

  1. #11
    Join Date
    Oct 2007
    Location
    Belgium
    Posts
    4,905

    Default Re: Flat battery

    Quote Originally Posted by MapisM View Post
    P
    I would change the above silly arrangement.
    The easier route is to get a small charger dedicated to that battery, connect it to the same AC line which feeds the existing charger, and leave it attached to the port battery. This way, whenever the main charger takes care of the other banks, also the port engine battery is kept topped up.
    +1
    fe a Victron Blue smart charger

  2. #12
    Join Date
    Jan 2009
    Location
    Stratford on Avon
    Posts
    11,243

    Default Re: Flat battery

    Pete, i expect you have a knackered battery. It is not holding charge. As others have said, it is not very clever to have a charger that only charges part of your set up.
    Last edited by rafiki_; 03-11-19 at 20:03.

  3. #13
    Join Date
    Jun 2010
    Posts
    1,002

    Default Re: Flat battery

    Personally I think it needs investigating properly as swapping a battery for another one is an exercise in futility if the issue is elsewhere, you replace the battery and still have the same problem and spent money for nothing.

    Begin at the beginning and remove the battery terminals overnight and measure the charge immediately after removing the terminals and then again in the morning and this will give an indicator of whether or not it is the battery or something else drawing power, then try and start the engine/s, if the battery seems fine then begin isolating circuits until you find the one discharging the battery and if you have a modern multimeter you can run up to 10amps through the meter to help find the offending circuit. Isolate that circuit overnight and try and start your engine/s and if they are fine then you have cracket it and you can innvestigate everything on that circuit.

    Had one recently and once the circuit was isolated I found a leak on a relay and when it was stripped the air gap between the contacts was clogged and a tiny current passed through it constantly and over a couple of days it discharged the battery sufficiently to prevent the engine from starting, cost? £2.48 for a new relay from a specialist supplier.
    I am old and wise because i was young and stupid.

  4. #14
    Join Date
    Nov 2005
    Location
    Sant Carles de la Rąpita
    Posts
    7,093

    Default Re: Flat battery

    A quick check - measure the voltage.
    If it is below 11v its is dead - end of discussion.
    I have a load tester that puts a load on the battery - if it can't hold its voltage over about 8 to 10 seconds - it is dead.
    Don't muck about - just change it.

  5. #15
    Join Date
    May 2001
    Location
    Jersey/Antibes
    Posts
    22,699

    Default Re: Flat battery

    Quote Originally Posted by petem View Post
    standard Fairline architecture is not to charge this battery from the battery charger.
    Possibly on your boat/year but not universally on fairlines and not on mine. As others have said, investigate whether something is drawing current, and fit a small trickle charger. Eg this if you want high end or something similar from another maker https://www.mastervolt.com/products/...-12-10-1-230v/

  6. #16
    Join Date
    May 2001
    Location
    ation, Loc: ation, Loc: ation.
    Posts
    16,717

    Default Re: Flat battery

    Quote Originally Posted by jfm View Post
    Possibly on your boat/year but not universally on fairlines and not on mine.
    Apologies, you've made that point before and I should remember to state that the architecture is for the smaller / Targa boats.

  7. #17
    Join Date
    May 2001
    Location
    ation, Loc: ation, Loc: ation.
    Posts
    16,717

    Default Re: Flat battery

    The guys have gone to replace the duff battery and have realised that the flat port side battery is the one that is connected to the charger (that I leave on) and the stand-alone battery (not connected to charger) is the one that still has charge.

    Seems like it could be a duff charger. If that's the case then what would be the best charger to replace it with?

    Also, do I really need a 50 amp charger to charge 2 x 135AH batteries?

  8. #18
    Join Date
    Feb 2015
    Location
    Conwy
    Posts
    4,338

    Default Re: Flat battery

    I gave my opinion earlier. You have the sun? Use it. Personally I think a modern MPPT controller is going to be the equivalent of anything else you are going to be recommended.

  9. #19
    Join Date
    Jun 2011
    Location
    Volos-Athens
    Posts
    4,940

    Default Re: Flat battery

    I agree with Bruce, although getting a solar panel that matches the style and shape of a boat is always a challenge...
    my 4 6V Trojan T105RE (225Ah) are charged throughout the year by my 30A Victron MPPT controller that with 600W solar panels rarely pumps more than 20A in them. They are absolutely fine. So doubt you really need more than 30-40A charger other than the first 20mins or so with depleted batteries where a larger charger would probably be capable of pumping more juice in them (and that's debatable)
    For the record, the mains charger is a 60A Victron, used once in 2019 (last week!) to check something with my batteries...

    my 2eurocent

    V.

  10. #20
    Join Date
    Oct 2007
    Location
    Belgium
    Posts
    4,905

    Default Re: Flat battery

    Quote Originally Posted by petem View Post
    Seems like it could be a duff charger. If that's the case then what would be the best charger to replace it with?

    Also, do I really need a 50 amp charger to charge 2 x 135AH batteries?
    depends on your mode of operation,
    we stay a lot on anker, and avoid running the genny for long periods,
    so powefull chargers are very important to us
    curently we charge our 2 x 620Ah banks with 2 x 200A (bulk) chargers (2 x Victron Quattro8000)

    for you, its the right moment to invest in a intelligent Charger / invertor combi,
    fe Victron Multiplus 1200, 1600 or 2000W

    is it 12V ?

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