Batteries

Discussion in 'Boat Design' started by FAST FRED, Jan 22, 2016.

  1. FAST FRED
    Joined: Oct 2002
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    Location: Conn in summers , Ortona FL in winter , with big d

    FAST FRED Senior Member

    "Hydrogen isn't going to stick around long enough to do anything."

    That's good as the batts are in USCG legal boxes that cover the top and only have a minor vent hole.


    "I do battery research and work on them all the time. We hand build and test them. The green "corrosion" is from acid leaking around the seal in the post. I'll take some photos of the inside of a battery tomorrow and post them."
    __________________
    Gonzo


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  2. gonzo
    Joined: Aug 2002
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    Location: Milwaukee, WI

    gonzo Senior Member

    Flooded cell batteries are not too common any more. AGM technology does not have acid sloshing around for oil to float on top. Oil has been used for at least a century to prevent evaporation and discharge by reaction with oxygen. Their claims about batteries needing to "breath" is absolute nonsense. Sealed batteries have a pressure relief valve, but that is only a safety feature.
     
  3. sdowney717
    Joined: Nov 2010
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    Location: Newport News VA

    sdowney717 Senior Member

    That site touting the demister oil, why not top off the water, then top off the water again, then top off the water again. Takes many months to actually lose water. Then some lead acid batteries are sealed. I have 2 sealed ones on my boat. I would have to pry off the top or drill holes into the case to check the level.
     
  4. gonzo
    Joined: Aug 2002
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    Location: Milwaukee, WI

    gonzo Senior Member

    If you have AGM batteries, they only have 85% saturation of the separator. They are not flooded like the old style. Their chemistry is different so they can be sealed.
     
  5. FAST FRED
    Joined: Oct 2002
    Posts: 4,519
    Likes: 109, Points: 63, Legacy Rep: 1009
    Location: Conn in summers , Ortona FL in winter , with big d

    FAST FRED Senior Member

    AGM technology does not have acid sloshing around for oil to float on top.

    Perhaps , but the cost keeps most cruisers with 120 year old wet cells that get too discharged and then heavily charged from car alts with hopped up Volt regulators.

    Seems to work well if they install a SOC meter and actually use it.

    They usually run 85% charged down to 50% charged and repeat that cycle till the batts die.

    Going from 85 to 100 is sometime done with solar or wind but is a desire that is seldom done.

    Would battery oil help this style of cruiser?
     

  6. portacruise
    Joined: Jun 2009
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    Location: USA

    portacruise Senior Member

    Just my humble experience over 40 years as a EV battery user.

    PC
     
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