Duff new battery? Advice please

Discussion in 'Motorhome Chat' started by maz, Oct 15, 2016.

  1. maz

    maz Funster

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    We have just taken delivery of 4 Dyno 30XHS 130Ah batteries from JustCarBatteries. These are deep cycle or traction batteries which we have not used before. Because we ordered 4 they were sent to us direct from the importer on a pallet, having been dry charged and then filled with electrolyte for dispatch.

    On measuring the voltages on arrival before charging, three were around 12.3v but one was at only 10.1v. We phoned JustCarBatteries to report this and were told to put it on charge for 3 hours and then ring them back with the voltage (which we are in the process of doing).

    To my mind, a battery at 10.1v is a damaged/dead/defunct battery. So my question is, would you be happy with a new battery that arrived reading 10.1v? Is this something specific to deep cycle batteries? If the other three arrived at 12.3v, why was this one down as low as 10.1v?

    Any advice gratefully received. :)
     
  2. vin0114

    vin0114 Funster

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    when you've given the 3 hours charge, take the reading then leave for a full hour and check any drop.
     
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  3. Tootles

    Tootles Funster

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    One cell is down. (y) The battery is faulty.
     
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  4. Gromett

    Gromett Funster

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    I would reject it.
     
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  5. maz

    maz Funster

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    Thank you all for your thoughts. My instinct is to reject it too. Nothing will be done now until Monday but I will monitor the voltage over the weekend now that it's off charge.
     
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  6. hilldweller

    hilldweller Funster Life Member

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    Since you have the time, fully charge. Find a headlamp bulb, normally 55W so 55/12.5 = 4.4A.

    Somehow wire to battery and log voltage every hour. Post results.

    Basically 130Ah / 4.4A should last 30 hours but we normally use half. So what is interesting is the voltage at 15 hours. I think it should be 12V / 12.1V.

    Or just sling it back.
     
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  7. vin0114

    vin0114 Funster

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    most likely right at 2v drop.
     
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  8. maz

    maz Funster

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    The battery charger is now fully charging one of the other new batteries. JustCarBatteries told us to leave the probably duff one off charge and see what it has dropped to by Monday morning.

    In the interests of science I would like to do the hourly thing with the headlamp bulb but my will to live would fast disappear over the horizon. :D

    I suspect, come Monday, it will be rejected.
     
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  9. hilldweller

    hilldweller Funster Life Member

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    Best move anyway, you will never have faith in it now.

    That is one hell of a battery bank. 130 x 4 = 520Ah.

    A normal charger is about 20A so would take 13 hours for a 50% charge.
    A single 100W solar, say 5A for 8h in Spain would in the order of 7 days.

    So what mega charging regime do you have ?
     
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  10. pappajohn

    pappajohn Funster Life Member

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    Sounds to me like it was never dry charged to start with, or at least only partially charged.
    To me, a 3 hour charge isn't going to put much in unless you have a very high output charger.
    Even a 20a charger will just about bang in 50% but as it won't reach absorption charge it will soon drop off.
     
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  11. maz

    maz Funster

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    These batteries are for the catamaran which is going to have 560w+ of solar.

    At the moment we are charging one battery at a time using the Sterling 20A charger that I kept from the Burstner. The final set up on the boat will be larger than that.
     
  12. Wildbill

    Wildbill Funster

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    Reject the battery it's defo a shorted or duff she'll I would be expecting beaten 20/30% refund on the the total purches costs for the inconvenience
    Bill
     
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  13. maz

    maz Funster

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    Thanks for that. I'll get mr maz to reply to your post as it's getting a bit beyond my limited battery knowledge. :blush:
     
  14. hilldweller

    hilldweller Funster Life Member

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    Proper job. Does this thing have sails ? I wonder how badly they interfere with solar.
     
  15. maz

    maz Funster

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    Yes, it has sails as well as twin Yanmar Diesel engines. The solar panels will be fitted onto a gantry across the stern. This seems to be a common arrangement so I'm guessing the sails don't interfere much - but I am only guessing. Mr maz has years of experience of solar on boats so again I'll get him to reply for you. :Smile:
     
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  16. mr maz

    mr maz Funster

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    Solar panels work very well on catamarans particularly when mounted on a stern gantry, on some points of sailing the panels will be shaded by the sails particularly when sailing towards the sun.
     
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  17. mr maz

    mr maz Funster

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    Having complained to the supplier, they requested the voltage after a 3 hour charge, this has now been given to them together with a 30 minute rest voltage (14.08 and 12.69). Neither of these voltage prove very much. They then asked for a voltage after 3 hours rest but I told them that I would ring them on Monday with that voltage and also a much more useful voltage after 36 + hours rest. The 3 hour rest voltage was 12.6v which if it stays stable and the battery passes a load test then perhaps the battery is ok? But I'm still unhappy that it should arrive direct from JCB's supplier having had the electrolyte added just before shipment and being delivered to us at such a low voltage.
    We will see on Monday!
     
  18. Langtoftlad

    Langtoftlad Funster Life Member

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    Distance Selling Regulations - you can reject for any reason (or no reason) within 7 days.
    [as I'm sure you know ;)]
     
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  19. jonandshell

    jonandshell Funster

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    I would be suspicious of the flat battery too.

    The only way to be sure is to fully charge all of them and check the open circuit voltage against the specific gravity of the electrolyte of ALL the cells.

    Tables are published on the Web, but I would like to see 1.260 or so at around 12.7 volts and 20 degrees C.
    If it's any consolation, our Dynos are still in great condition after some 8 1/2 years now. You have been a bit unlucky.
     
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  20. mr maz

    mr maz Funster

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    Only just seen your reply, thanks for the advise and we will do just that and see what the tests show.
     
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