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October 9, 2015 at 12:38 am #217507
My fishing buddy’s #1 battery died today so we used the #2 to get back to the dock. He wanted to get a dual purpose battery to replace it having 2 duals. I have always had my starting battery 1000 amps cranking as my #1 and a dual as my #2. What is the best setup for dual batteries? I switch over to my #2 when drifting or anchored over rocks then switch to the #1 for starting (mostly the first start of the day).
October 9, 2015 at 1:28 am #217508
Does motor on the boat charge a battery? Or is one battery a deep cycle for trolling motor?
October 9, 2015 at 11:15 am #217513
We don’t have trolling motors and our mercury’s charge while running.
October 9, 2015 at 11:29 pm #217536
I never had two different types of batteries unless flats boats that have deep cycle ones that have to be recharged often.
He should get a three way battery switch (could be called four way). Has battery 1 or 2 or both (which it should be on when running) and off. Just pick one battery for backup, and one for gps, radio, fishfinder, etc and switch to just the one you pick for when motor off. Also if boat not sitting in a wet dock make sure to turn switch to off. The gps, fishfinder, radio have their own batteries for data.
IF IS WET DOCKED, DO NOT TURN OFF BATTERIES, just switch to one of them. In case bilge pump has to come on.
Hope that helps,
October 9, 2015 at 11:54 pm #217537
I know this doesn’t apply directly to the question but I thought i’d throw this out there for possible discussion. There are only two things wired directly to both my batteries and NOT going through my battery selector switch. They are my bilge pumps through automatic switches. Safer. Ed.
October 10, 2015 at 6:08 pm #217549
Yes I have my bilge directly going to the batteries. My friend went ahead and got a second deep cell combination so he has 2. I still like my #1 to be at a 1000 crank amp starting battery, they come in handy on those cold days the old mercury feels sluggish.
Thanks for all the input.
October 11, 2015 at 2:04 pm #217551
Capt. Tom McLaughlinMember
If you run your switch on “all” your batteries will be much happier and last a lot longer if they are the same type and amp hour rating. It’s bothing catostrophic, but it definitely makes a BIG difference.
October 19, 2015 at 2:09 am #217651
If you have two different size batteries and use engine to charge when running you risk burning out the alternator. As for having the bilge pumps wired directly to batteries, instead of using the selector switch, I in past have wired bilge to both #1 and #2 through the selector switch and only use one or the other to power bilge pumps. My last boat was in wet dock, and the one time it rained for, well seemed like weeks my #1 battery died (which I had on for pumps) boat was listing to one side was nice to have other battery to switch to.
Just a thought
October 19, 2015 at 8:48 pm #217668
A word of caution about selector switches: DO NOT change the switch while the motor is running…you will blow the motor electronics for sure.
December 11, 2015 at 2:20 am #218244
Grandoug I haven’t found that to be the case? But I don’t often do it, but have on rare occasion with no negative result. I love my on board trickle charger it is the best battery life elongater I ever tried.
December 12, 2015 at 2:46 am #218264
The mechanics at Apopka Marine warned me about it when they installed my dual switch…they said switching bewteen batteries whrn the main motor is running will blow the diodes in the motor starter. I take them at their word, and its been OK with my Yama 90 so far.
December 26, 2015 at 2:10 pm #218425
I believe most modern selector switches wipe both contacts prior to disconnecting the first one and therefore the circuit never goes open and harms the rectifier.
January 5, 2019 at 7:00 pm #436530
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