What does "matched batteries" actually mean?

Discussion in 'Solar Power' started by acropolis22, Jan 5, 2016.

  1. acropolis22

    acropolis22 Funster

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    Been reading various threads that mention "matched batteries" where you are adding a second leisure battery. What is it that needs matching? I also read that you can add a battery with a different capacity to the first, so presumably we are matching something else. Is it just type of battery? Andrew
     
  2. scotjimland

    scotjimland Funster Life Member

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    Ideally, both identical.. same make , same type, same capacity (ah ) and age..

    you can get away with different sizes (ah) but NOT type ie do not mix AGM, FLAs or Gels..

    can also get away with different ages provided there isn't too big a difference, if so the weaker older battery will drag down the new one..

    I recall one person who was so particular that they were identical, he visited the battery factory and bought two off the production line with consecutive serial numbers..
     
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  3. acropolis22

    acropolis22 Funster

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    Many thanks. Can't see myself visiting the factory, but have logged your advice. Andrew
     
  4. eddievanbitz

    eddievanbitz Trader - Funster

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    Funny how the manufacturers get away with putting them in parallel for on road charging;)
     
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  5. scotjimland

    scotjimland Funster Life Member

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    Nor I,

    but when I lived in Essex I went to the Lincoln battery factory at Leigh-on-Sea to buy off the production line.. can't get fresher than that..
     
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  6. scotjimland

    scotjimland Funster Life Member

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    manufacturers get away with lots of things... like selling leaky vans that are not fit for purpose..
     
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  7. eddievanbitz

    eddievanbitz Trader - Funster

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    Good post
     
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  8. tonka

    tonka Funster Life Member

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    OI !!!!!!!

    LEAVE MY WATERTRAIL ALONE.... I mean Autotrail... :rofl::rofl::rofl:
     
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  9. Lenny HB

    Lenny HB Funster

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    I know you have a thing about that Eddie, but in practice not that bad.
    The most common situation being a Gel Leisure with a wet flooded starter battery. The alternator will be charging at Approx 14.3v which is fine for both batteries once the Gel reaches 14.3v it needs to be held there for 8 hours for a full charge so it may not get a full charge on shorter journeys, on longer ones the voltage won't worry a Gel. When charged from the mains agree it is not ideal to hold the starter battery at 14.3v for such a long period, but charge to the starter battery is normally limited to 2.5 amps so unlikely to do any harm.
     
  10. eddievanbitz

    eddievanbitz Trader - Funster

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    Hi Lenny, lol you right I do bring it up a lot, but really only to make people think. Us traders get a lot of stick about trying to flog things (Yes it is our job) but you would be amazed at the level of battery paranoia from some of our customers.

    "Hi I have a 2016 "XYZ" Motorhome and I have space for a 2nd battery. My mate has told me that they must be exact so can you remove this perfectly good new battery and fit two "new" perfectly good batteries?

    We suggest simply supplying a 2nd identical to slot in alongside what is there and it is as if we are talking rubbish lol!

    GEL batteries are in my mind an expensive waste of money that have only insidiously crept into the motorhome market due to the German obsession with liquids in crashes and recycling.

    Personally a lead acid battery with lids is the way to go. But I started at the Longlife Tyre and Battery Company at 16 making battery cases, soldering lead plates and filling batteries from Carboys. As it was dangerous, I at 16 being the youngest got the shitty jobs lol
     
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  11. acropolis22

    acropolis22 Funster

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    Does that imply that in an ideal world you would match the two leisure batteries, but ALSO the starter battery? Andrew
     
  12. thehutchies

    thehutchies Funster

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    I used to do that at the battery supplier's.
    All off the same pallet, consecutive numbers.
    As I was buying eight leisure batteries at a time, they were happy to humour me :)
     
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  13. scotjimland

    scotjimland Funster Life Member

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    are you 'son of GT ' ?

    :LOL:
     
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  14. thehutchies

    thehutchies Funster

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    STEADY ON! :Eeek:
     
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  15. Lenny HB

    Lenny HB Funster

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    Yes, but it's never going to happen with current battery technology.
     
  16. acropolis22

    acropolis22 Funster

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    I'm afraid I'm not kowledgeable enough to get your meaning. Can you elaborate? Andrew
     
  17. eddievanbitz

    eddievanbitz Trader - Funster

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    If you are starting out from scratch, with an unlimited budget to build say a space shuttle, there are lots of things that you would do in an "ideal world" For example, you would have two alternators, for two battery banks, one engine and one axillary to avoid any anomalies or voltage disparagy on start up.

    On a boat for example where budget is less important on design to function you will often see a twin engine set up. Each engine will control two banks of batteries, using a far more sophisticated split charging system than a relay used in 99% on European motorhomes. You will have a bank of batteries for the Port engine, a bank of batteries for the Starboard engines, another for Axillary use (house) and a fourth for bow and sturn thrusters, possibly a fifth for a generator battery system. Because they are independently charged you can use different battery types and, in turn have different charging voltages and regimes.

    In a 90% of motorhomes, which are built on delivery vans, with one original alternator, we simply link all the batteries together once the engine starts to run. We energise a relay from the D1 terminal on the alternator (designed to simply put the alternator warning light out) and we use, despite how pretty the outer casing and the impressive sounding name, a simple automotive relay.

    However, for 90% of motorhomes is works OK most of the time for most of the people
     
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  18. Lenny HB

    Lenny HB Funster

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    Due to personal experance I am a big fan of Gel's, prices have reduced to sensible levels now. With my Hymer requiring a low profile battery, Gel was the only choice to achieve a reasonable capacity.
     
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  19. gus-lopez

    gus-lopez Funster

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    Also in the event you had an accident you were dispensable.:LOL: Ahh , the good old days.:D
     
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  20. eddievanbitz

    eddievanbitz Trader - Funster

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    I had the last laugh! They work for me now!
     
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