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3 batteries, 2 switches... Am I over thinking this?

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  • 3 batteries, 2 switches... Am I over thinking this?

    Right now I have two batteries and a single 1/2/B/O switch that I'll call switch1. The common connects to both the engine and the "house" breaker so whatever the switch is on runs the whole boat. I normally start from the starting battery then switch to both to charge while running and then switch to the house battery when the engine is not running. But I have forgotten to switch to the house when anchored and it's very inconvenient when fishing.

    What I'm considering is having the common for switch1 connect only to the engine and installing a second 1/2/B/O switch (and a second deep cycle house battery) on the house side with it's common connected to the house breaker AND the #2 position on switch1. The goal of course is to be able to run the house (lights, stereo, GPS, fishfinder, VHF radios, pumps, etc) without ever worrying about draining the starting battery. In this configuration, the only way the house could drain the start battery is if switch1 is in the BOTH position which I would never use unless I had run both house batteries down and wasn't headed to the marina to plug in to shore power.

    So assuming a single day on the boat I would be able to turn both switches from OFF to 1, start the engine and run to wherever I'm going to anchor or fish then spend the entire day with the electronics running and still be able to start the boat to get back to the slip and turn both switches OFF and let the charger do it's thing.

    So that's what's on my mind today. Am I over thinking this? I'm trying to make it as fool proof as possible and this seems to do it with minimal expense with only having to purchase a switch and the battery cables to connect the house batteries to the new switch.

    Thanks

    2008 Maxum 1800MX - 'Lottie-Da'
    1994 Proline 2510 - 'DrifteR ' <- project - ON THE WATER!
    1971 Concorde 27' - 'Little Angel ' <- sold

  • #2
    you already have a simple system

    battery 1 is your start battery
    battery 2 is your pair of house batteries

    you are over-thinking it

    I generally charge each battery at the beginning of the season with the cables disconnected

    then battery 1 for starting, allow motor to warm up (dealing with lines, etc.)
    switch to all for motoring to your anchoring spot
    shut off motor, then switch to battery 2 for house loads.

    in your case, you will be using shore power to keep your house batteries topped off
    so run the motor on battery 1
    run the house loads on battery 2

    you can use ACR's to charge if you want to try to make it a bit more fool proof.

    AllDodge has a nice sketch of a system using ACR's and a single switch.
    Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

    1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

    Past Boats
    1970 Wooster Hellion - Merc 9.8
    2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
    1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

    What’s behind you doesn’t matter.Enzo Ferrari

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    • #3
      Yeah.... Except that twice already I have forgotten to switch to the house battery when anchored and have been lucky enough to not end up with two dead batteries.
      2008 Maxum 1800MX - 'Lottie-Da'
      1994 Proline 2510 - 'DrifteR ' <- project - ON THE WATER!
      1971 Concorde 27' - 'Little Angel ' <- sold

      Comment


      • #4
        put a note on your dash
        Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

        1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

        Past Boats
        1970 Wooster Hellion - Merc 9.8
        2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
        1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

        What’s behind you doesn’t matter.Enzo Ferrari

        Comment


        • #5
          Originally posted by TBarCYa View Post
          Yeah.... Except that twice already I have forgotten to switch to the house battery when anchored and have been lucky enough to not end up with two dead batteries.
          Got tired of that game long ago and installed a ACR. No more worries
          ....

          Comment


          • #6
            Agree ACR

            Click image for larger version

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            94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
            95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
            07 Seadoo GTX
            Merc Adults Only VP Adults Only
            G-Dad always said "First Liar doesn't stand a chance"

            Comment


            • #7
              I did something similar with continuous duty solenoids in a Jeep years ago...
              2008 Maxum 1800MX - 'Lottie-Da'
              1994 Proline 2510 - 'DrifteR ' <- project - ON THE WATER!
              1971 Concorde 27' - 'Little Angel ' <- sold

              Comment


              • #8
                Sign up today
                Yep, ACR here too! No room for error. No worries...the way I think of it, I can enjoy boating a little more not having to worry if both of my batteries are charging.

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