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Thread: Battery type
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06-04-2019, 12:42 PM #11
Found this, explains it very well.
https://www.boattest.com/view-news/3...switch-dilemma2018 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 1800sr3, sold
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06-04-2019, 03:30 PM #12Senior Member
- Join Date
- Aug 2011
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- 2,522
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
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06-04-2019, 04:12 PM #13
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 1800sr3, sold
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06-04-2019, 04:15 PM #142018 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 (Sold)
2021 GMC Denali 2500
Soulcraft Vodoo
Soulcraft Jordi Pro
Soulcraft Super AV
Phase Five Matrix
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06-04-2019, 04:17 PM #152018 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 1800sr3, sold
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06-04-2019, 04:23 PM #16Senior Member
- Join Date
- Aug 2011
- Posts
- 2,522
http://www.instgram.com/jlyons30
2002 Moomba Mobius LSV - Sold
2006 Moomba Mobius LSV - Sold
2017 Moomba Craz - Enzos, Lead
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06-04-2019, 04:33 PM #17
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
310 HP PCM
SOLD
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06-04-2019, 04:36 PM #18
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 1800sr3, sold
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06-04-2019, 04:44 PM #192018 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 (Sold)
2021 GMC Denali 2500
Soulcraft Vodoo
Soulcraft Jordi Pro
Soulcraft Super AV
Phase Five Matrix
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06-04-2019, 04:52 PM #20
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 1800sr3, sold