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Battery Switch and 2 Batteries...

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  • Battery Switch and 2 Batteries...

    We want to install a 2 batteries and a battery switch in our boat. It currently has an Interstate SRM-24 battery (don't know how old, we just bought the boat). I've heard you are supposed to buy 2 new batteries at the same time if you plan on installing 2 - is this true? And what type of battery would you recommend buying? Should I stay with the 24 group? Space is not an issue. We will be running a HDS-5 Combo (fish finder/gps) and a stereo, and whatever else draws power in the boat. I don't want to go overboard and waste money on batteries, I just want to know what to buy that's practical...

    Thanks for your advice...
    Desera

    '98 Larson 206LXi
    Thanks,
    Desera

    '98 Larson 206Lxi BR


  • #2
    Re: Battery Switch and 2 Batteries...

    Great question as I'm going to do the same thing very shortly. Will be watching this thread.

    Comment



    • #3
      Re: Battery Switch and 2 Batteries...

      Cool,

      I just did the exact same thing last weekend. I am not aware of any rule saying you must buy the batteries at the same time, but one of these ole salts in here will probably advise to that, I am way to new to the boating scene to comment on that. This is my first boat, and bought it used the end of last Aug. But since my interstate battery was 2.5 yrs old and the only battery I had, I elected to get two new ones, and keep the interstate on a tender as a backup just in case type of thing. I wanted a big ole deep cycle to run all our toys and tunes when beached, and a strong starter battery to handle the cold cranking chores and be able to switch between them.

      I have installed a Perko 8501DP Marine Battery switch, with a 1000 amp continental starter battery on "1" and deep cycle on "2". Came with a great diagram and instructions. It Looks great in my engine compartment and works great in all tests and I predict will be highly functional for what I wanted it for. Didn't want to get caught running down my 1 battery at the beach blowing up tubes and cranking out the tunes with the system in my boat. I installed it in the engine area so the kids [little] would not gravitate to it and start turning the knob back and forth.
      What ever it is...if your getting friend, family, or self time away from the office on the water....what ever the flotation device....it cant be half bad!

      `07 Glastron GXL 205 in Black Trim
      5.0 GXi (270hp) Volvo Penta
      SS VP Prop
      Platform/Bimini
      sigpic

      Comment



      • #4
        Re: Battery Switch and 2 Batteries...

        I've been doing some searching on this forum for ideas as well. I'm getting ready to pull the trigger on this exact thing. I'm not an electrical genius either, so I'm curious to see what people are doing. I want to be able to charge both batteries at the same time when the engine is running too. I'm kind of confused at how to run all the wiring.
        1996 Rinker Captiva 212 Cuddy
        5.7L Merc Alpha One Gen 2

        Comment



        • #5
          Re: Battery Switch and 2 Batteries...

          i have two batteries now, but i spend all day switching back and forth from 1 to 2. i want this Blue Sea System

          "Just Chillin" 1995 Donzi 275 Medallion Merc 7.4 I/O Bravo 3
          sigpic

          Comment



          • #6
            Re: Battery Switch and 2 Batteries...

            Understand! I am an electrical moron. Reputable Boat mechanic did mine, but like a said it had a great diagram and instructions, I just dont want to A. shock the crap out of myself, that sucks, and B. ruin something on my new boat. So I acquired the new battery tray, switch , and batteries and took it all to him and he had the marine battery cable in bulk, he charged me a modest fee to install. It tested well and he guarantee's his work for 180 days. So if its jacked up he will fixy.

            The job was very professional..and I have 350 bucks in it total parts (including both batteries) and labor, keeping in mind this is a fancy setup for a 20' family lake runabout.
            What ever it is...if your getting friend, family, or self time away from the office on the water....what ever the flotation device....it cant be half bad!

            `07 Glastron GXL 205 in Black Trim
            5.0 GXi (270hp) Volvo Penta
            SS VP Prop
            Platform/Bimini
            sigpic

            Comment



            • #7
              Re: Battery Switch and 2 Batteries...

              [QUOTE=scutly;2576635]i have two batteries now, but i spend all day switching back and forth from 1 to 2. i want this Blue Sea System

              Hmmmmmmm. I like that a lot. Looks like they dumb it down for the kindergarten installer. Perfect!
              1996 Rinker Captiva 212 Cuddy
              5.7L Merc Alpha One Gen 2

              Comment



              • #8
                Re: Battery Switch and 2 Batteries...

                I did not see anything from any of the previous posters that would require any of you to absolutely need a dual battery setup or a switch. Unless you have a killer stereo system with high power amps, a trolling motor, electric anchors, or any other high current draw items you simply do not need a switch. Many folks use them incorrectly anyway. Here's the deal. First, you do not need two new batteries when you install a switch unless they are due for replacement anyway. What size battery you use depends on what you run off of them. Obviously battery capacity (amp/hrs or reserve minutes) is the measure of that. More is better. You cannot go too big with batteries -- just too small. The difference in price is rather insignificant. Next, if battery switch use confuses you, then opt for an ACR (automatic charge relay) or VSR (voltage sensing relay) both of which do the same thing in that one battery (usually the start battery) is designated the primary and only it will be charged until the trip point on the ACR/VSR is reached. At that point charging switches to the secondary or house battery. If you do insist on a switch, then get over the notion that some things get wired to the house battery and only the engine stays on the start battery. Both batteries get wired to the switch. Everything on the boat except an automatic bilge pump gets wired to the COM terminal on the switch. Then whatever battery (!, 2, or BOTH) is selected is what powers the loads and the engine. There is absolutely no reason to be constantly messing with the switch. Set it to BOTH and go. If you do happen to beach the boat or run a trolling motor for an extended periiod, THEN switch to the house battery to save the start battery. Simple as that.

                Comment



                • #9
                  Re: Battery Switch and 2 Batteries...

                  Here is the diagram:

                  http://gator49.hostgator.com/~zeromy...500INS1%29.pdf

                  Here is the switch I have:

                  http://gator49.hostgator.com/~zeromy...roducts_id=148
                  What ever it is...if your getting friend, family, or self time away from the office on the water....what ever the flotation device....it cant be half bad!

                  `07 Glastron GXL 205 in Black Trim
                  5.0 GXi (270hp) Volvo Penta
                  SS VP Prop
                  Platform/Bimini
                  sigpic

                  Comment



                  • #10
                    Re: Battery Switch and 2 Batteries...

                    Killer Stereo here. And that is what I got it for. Beaching for extended stays, switch to house battery. Everything on mine is wired to com just like silvertip said.
                    What ever it is...if your getting friend, family, or self time away from the office on the water....what ever the flotation device....it cant be half bad!

                    `07 Glastron GXL 205 in Black Trim
                    5.0 GXi (270hp) Volvo Penta
                    SS VP Prop
                    Platform/Bimini
                    sigpic

                    Comment



                    • #11
                      Re: Battery Switch and 2 Batteries...

                      if your still on the fence, check this video out
                      "Just Chillin" 1995 Donzi 275 Medallion Merc 7.4 I/O Bravo 3
                      sigpic

                      Comment



                      • #12
                        Re: Battery Switch and 2 Batteries...

                        Wow, so many responses it's overwhelming! We do not run any special high powered fancy anything, but we do plan on anchoring out and listening to the radio, blowin' up toys, etc for very long periods at a time and I'm just the kind of crazy lady that I'll drive my hubby crazy making him start the boat every 30 min to prove to me we're not stranded. See, a couple hundred will make me a happier person (which makes everybody happier!). So, I have three questions I'm trying to get answered:

                        1. We were going to install a perko switch for like $40 and I don't think I'm confused about the switch.. turn it to any single battery when we anchor out for the day - turn it back to both when we start her back up, right?

                        2. Can I grab another interstate SRM 24 (like I already have in the boat) for $75 at the dealer down the street or am I being too cheap? (apparently I'm currently running on one deep cycle battery as my only battery - guy at the battery store said that's fine)?

                        3. Can I use 2 different kinds of batteries on the switch (one deep cycle and one cranking) or should I just throw a second deep cycle on there and keep it simple?

                        Is this enough for the peace of mind I'm looking for?

                        Thanks,
                        Desera
                        Thanks,
                        Desera

                        '98 Larson 206Lxi BR

                        Comment



                        • #13
                          Re: Battery Switch and 2 Batteries...

                          I doing the same thing. I'm putting in two new batteries. Only b/c my previous is 5yr old. One deep cycle and one starting. I'm going to use the blue sea 6011 switch. Its a new one and very simple. One battery is strictly for the stereo/electronics and one is for the engine. Set the switch to combine when you run around to charge both. Very simple. By the way, don't forget the marine electrical wires, they are very expensive.

                          Comment



                          • #14
                            Re: Battery Switch and 2 Batteries...

                            marine electrical wires? can you send me a link to what i need? I have a friend who is an electrician who will install this for me, but I'd like to gather everything before he goes out of his way to come over and put it in.
                            Thanks,
                            Desera

                            '98 Larson 206Lxi BR

                            Comment



                            • #15
                              Sign up today
                              Re: Battery Switch and 2 Batteries...

                              Originally posted by rauch0812 View Post
                              marine electrical wires? can you send me a link to what i need? I have a friend who is an electrician who will install this for me, but I'd like to gather everything before he goes out of his way to come over and put it in.

                              Your lucky I did all the work. No questions ask, best deal ever. See the custom build area.

                              http://shop.genuinedealz.com/

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