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Thread: Battery type

  1. #11
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    Found this, explains it very well.


    https://www.boattest.com/view-news/3...switch-dilemma
    2018 Supra SA400 aka The Ron Burgandy
    2011 Sea-Doo Wake 155
    2015 Mojo Surf, sold...2013 Axis A22 Recon Edition, sold...2010 Axis A22, sold...2007 Maxum 180sr3, sold

  2. #12
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    Quote Originally Posted by KnoxMojo View Post
    Except for the dead battery scenario and switching to both.

    If one battery is dead and the other full they will equalize and result in 2 weakly charged batteries and probably not enough to start the boat.

    Best to start the boat with the good charged battery then switch to both so the alternator can charge them both.

    The other option is you forget to switch to the other battery to keep it charged. Then you drain the other, now you have two dead batteries.

    Best to leave it always on both., unless sitting in the cove, then switch to one battery so you don't kill both batteries. Then after starting go back to both so both batteries are charging.
    Last edited by parrothd; 06-04-2019 at 03:36 PM.
    http://www.instgram.com/jlyons30
    2002 Moomba Mobius LSV - Sold
    2006 Moomba Mobius LSV - Sold
    2017 Moomba Craz - Enzos, Lead

  3. #13
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    Quote Originally Posted by parrothd View Post



    Best to start the boat with the good charged battery then switch to both so the alternator can charge them both.


    It said in the article that it would not charge both equally in that scenario.

    "If the switch is in the “BOTH” position and one battery is nearly at a full charge and one is flat, the alternator will “read” the higher of the two, and the flat battery will never be charged"

    I think the better way would be to start the boat with just the good battery as you said, then switch to the other battery while cruising. The alternator will both run the boat and charge the weak battery.

    It also says this.. "NEVER use the “BOTH” position except to parallel both batteries if they’re both flat, almost like an attempt to “jump start” your own engine.

    But to each their own. I have been more doing it this way for years and have never been stranded.
    2018 Supra SA400 aka The Ron Burgandy
    2011 Sea-Doo Wake 155
    2015 Mojo Surf, sold...2013 Axis A22 Recon Edition, sold...2010 Axis A22, sold...2007 Maxum 180sr3, sold

  4. #14

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    Quote Originally Posted by KnoxMojo View Post
    I have been more doing it this way for years and have never been stranded.
    Knock on some wood Knox...quickly!!
    2018 Supra SL550 with 850lbs of lead wake
    2017 Supra SA400 (Sold)
    2016 Moomba Mojo Surf Edition (Sold)
    2017 Ford F250 Super Duty(Sold)
    2019 Ford F250 Super Duty
    Soulcraft Vodoo
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  5. #15
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    Quote Originally Posted by Prospersigman View Post
    Knock on some wood Knox...quickly!!
    How so? I always have at least 1 fully charged battery. Unless my alternator goes out, how would I get stranded? And I just knocked on wood (my head) for good measure..lol
    2018 Supra SA400 aka The Ron Burgandy
    2011 Sea-Doo Wake 155
    2015 Mojo Surf, sold...2013 Axis A22 Recon Edition, sold...2010 Axis A22, sold...2007 Maxum 180sr3, sold

  6. #16
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    Quote Originally Posted by KnoxMojo View Post
    It said in the article that it would not charge both equally in that scenario.

    "If the switch is in the “BOTH” position and one battery is nearly at a full charge and one is flat, the alternator will “read” the higher of the two, and the flat battery will never be charged"

    I think the better way would be to start the boat with just the good battery as you said, then switch to the other battery while cruising. The alternator will both run the boat and charge the weak battery.

    It also says this.. "NEVER use the “BOTH” position except to parallel both batteries if they’re both flat, almost like an attempt to “jump start” your own engine.

    But to each their own. I have been more doing it this way for years and have never been stranded.

    The author doesn't seem to know how alternators and batteries work. I would carry jumper cables.. lol..
    http://www.instgram.com/jlyons30
    2002 Moomba Mobius LSV - Sold
    2006 Moomba Mobius LSV - Sold
    2017 Moomba Craz - Enzos, Lead

  7. #17
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    If you have a battery that can't maintain a charge, toss it. A dead battery is considered a load and
    a big on at that. Both batteries connected while running will have the same voltage but the current draw will be different. Having a huge alternator, the batteries will be charging around 14 volts. So run 1+2 while running, isolate the batteries when shut down.
    1998 Mobius
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  8. #18
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    Sure thing, just in case you need them...lol
    2018 Supra SA400 aka The Ron Burgandy
    2011 Sea-Doo Wake 155
    2015 Mojo Surf, sold...2013 Axis A22 Recon Edition, sold...2010 Axis A22, sold...2007 Maxum 180sr3, sold

  9. #19

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    Quote Originally Posted by KnoxMojo View Post
    How so? I always have at least 1 fully charged battery. Unless my alternator goes out, how would I get stranded? And I just knocked on wood (my head) for good measure..lol
    Just didn't want you to jinx yourself thats all...
    2018 Supra SL550 with 850lbs of lead wake
    2017 Supra SA400 (Sold)
    2016 Moomba Mojo Surf Edition (Sold)
    2017 Ford F250 Super Duty(Sold)
    2019 Ford F250 Super Duty
    Soulcraft Vodoo
    Phase Five Matrix

  10. #20
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    Quote Originally Posted by zabooda View Post
    If you have a battery that can't maintain a charge, toss it.
    Completely agree. chuck it.

    Wonder if these new boats come with an ACR, or automatic charging relay? In that case, would it really matter if it was just left in both at all times? Or any sort of charge management for that matter. Guessing that article from boat test was talking about just a standard switch with nothing else. But I do tend to crank in both then switch to 1 or 2 and never had an issue. and only one or the other anchored out or tied up.
    2018 Supra SA400 aka The Ron Burgandy
    2011 Sea-Doo Wake 155
    2015 Mojo Surf, sold...2013 Axis A22 Recon Edition, sold...2010 Axis A22, sold...2007 Maxum 180sr3, sold

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