Black stuff on battery caps

Discussion in 'Tech/Mech General' started by Steve, Feb 2, 2014.

  1. Steve

    Steve Funster Life Member

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    As today has been dawn to dusk sunshine:Cool: I have been doing jobs before my trip south. I took both the batteries out and cleaned the terminals and checked electrolyte level's all good but noticed that on one of the batteries all of the caps had black oily stuff on them. Both batteries are the same age (18 months) both the same and no problem with charge. I dropped tested both and the were the same.(no that does not mean I dropped then on the floor)so what's the black stuff?
    Steve
     
  2. scotjimland

    scotjimland Funster Life Member

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    Gunk :BigGrin:
     
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  3. Steve

    Steve Funster Life Member

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    thank-you for a most useful reply:Doh: I love this site
     
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  4. scotjimland

    scotjimland Funster Life Member

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    you didn't expect a technical answer did you ? ... :Laughing:

    Take a sample for analyses and post it on here :Wink:
     
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  5. pappajohn

    pappajohn Funster Life Member

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    no idea, unless its some kind of chemical reaction between the cap and electrolyte if that battery had been gassing for any reason.
    normal gassing residue would just be wet and clear
     
  6. Steve

    Steve Funster Life Member

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    yes my thoughts as well. I have never seen it before tried to wash it off with soapy water but didn't move it, but petrol did the job which makes me think its oil based. will have to wait and see what develops.
     
  7. scotjimland

    scotjimland Funster Life Member

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  8. Steve

    Steve Funster Life Member

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  9. treetops1

    treetops1 Funster

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    I always put a bit of grease on my terminals to avoid a build up of that white stuff and it does work .It maybe dirty grease lol.
     
  10. WynandJean

    WynandJean Funster

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    Just what I was about to say.

    Wyn
     
  11. pappajohn

    pappajohn Funster Life Member

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    now you lost me......why would solar panels cause the black stuff ?
     
  12. Steve

    Steve Funster Life Member

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    I am not saying it is the panels? but the forum that was talking about a similar problem was a solar forum site in usa. perhaps a downside to the way the controller works. I have noticed that when the batteries are full the volts go up to 20+ but amps at 0.1 so maybe a product of desulphurisation. I will look for more info and wait for others to reply.
    An interesting subject, well I think so.
    Steve
     
  13. scotjimland

    scotjimland Funster Life Member

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    I think you are spot on..

    whatever it is on the caps it it's coming from inside the battery.. so if it is gassing excessively that may well be damaging the plates.. long term not good..
     
  14. pappajohn

    pappajohn Funster Life Member

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    Whoa !!!....i would be looking for another solar controller.

    Batteries START to gas at around 14.8v...at 20v they will be boiling.

    The controllers voltage should always be around 13.5/13.8v regardless of charge state.
    Output at the panel terminals should around 17v, reduced to 13.8v after the controller.
     
    Last edited: Feb 2, 2014
  15. pappajohn

    pappajohn Funster Life Member

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    Whoa !!!....i would be looking for another solar controller.

    Batteries START to gas at around 14.8v...at 20v they will be boiling.

    The controllers voltage should always be around 13.5/13.8v regardless of charge state.
    Output at the panel terminals should around 17v, reduced to 13.8v after the controller.
     
  16. Steve

    Steve Funster Life Member

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    Yes I agree, I think I need to give the batteries a little more work to do, or even remove one of them. Going off to Spain etc next week so will save some cash and not use EH.
    Steve
     
  17. Steve

    Steve Funster Life Member

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    You are quiet right pappajohn I was looking at the output from the panels to the controller not the output from the controller to the batteries 14.6v
     
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