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The Official Dual Battery Thread

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  • 1991 ProStar / 351W with 1:1 Velvet Drive

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    • After a lot of research I couldn't be happier with my Blue Sea "Add A Battery" System.

      Thanks to reading this thread for the suggestion...haven't had a single battery related problem since I installed it this spring.

      I have one cranking battery and one deep cycle. I just turn the switch to ON when I start and OFF when I put her away at night. Then there's COMBINE if I ever needed it.

      Easy installation too...any questions about it just let me know.
      '78 S & S

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      • Also wanted to say that I got a great deal on my cables at http://genuinedealz.com/

        I ordered everything and had them make the cables for me. They all arrived exactly as I ordered, and I just had to hook them up. Great prices, and they made them just how I wanted them. Really couldn't be happier. I first heard of them through a post on this site, so thanks to whoever posted the link (I think it was sodar)
        '78 S & S

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        • What gauge are the factory battery cables on a Prostar?
          1991 ProStar / 351W with 1:1 Velvet Drive

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          • Originally posted by Lumbergh View Post
            What gauge are the factory battery cables on a Prostar?
            Four for most. Stands true for the 93 for certain.
            93 190
            (safe click)

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            • Wow, I read up to Pg 5, and at that point I was looking at the BW R3098 relay making up dual battery set-up.

              The specs don't indicate it's a latching relay. I suspect it's general purpose starting relay.
              Wouldn't latching be preferred? Vs a constant draw/drain on the Batteries.

              Current research - Amazon $63 - advanceautoparts - $43



              Other - SD SERIES 7800
              Last edited by Philscbx; 05-28-2012, 12:10 PM.

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              • Don't know the answer to your question but I can tell you I'm on my fourth season with the Blue Seas "add a battery set up" with no issues. Easy install, all parts tested/included, no questions needed or answers required. Best of all it works.

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                • Originally posted by bturner2 View Post
                  Don't know the answer to your question but I can tell you I'm on my fourth season with the Blue Seas "add a battery set up" with no issues. Easy install, all parts tested/included, no questions needed or answers required. Best of all it works.
                  X2.... Works great!
                  -Cameron
                  2007 ProStar 197
                  1996 ProStar 190

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                  • Quick question on fuse sizes??? What size circuit breakers are most running from the islator to the battery for both the starter side and the house battery side??? Also if I go from a 70 amp alternator is it really necessary to change all of the associated wiring??? I have seen through this thread so many different opinions my head is spinning. What is the consensus?

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                    • Originally posted by 51timber View Post
                      Quick question on fuse sizes??? What size circuit breakers are most running from the islator to the battery for both the starter side and the house battery side??? Also if I go from a 70 amp alternator is it really necessary to change all of the associated wiring??? I have seen through this thread so many different opinions my head is spinning. What is the consensus?
                      The Blue Seas Add-A-Battery installation guide has some guideance on wire sizes and fuse sizes. There is also a URL to a calculator in those instructions that should help with wiring sizes:

                      https://bluesea.com/files/resources/.../990310020.pdf
                      I love to travel, but hate to arrive. ~~ A. Einstein
                      ---
                      Life should not be a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, in a cloud of smoke, thoroughly used up, totally worn out, and loudly proclaiming, Wow! What a Ride! ~~ Hunter S. Thompson
                      ---
                      My wakeboard is calling, and I must go ride! ~~ Me
                      ---
                      It is better to light one small candle than to curse the darkness. ~~ Chinese fortune cookie

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                      • I am thinking of upgrading my '04 X-10 to a dual battery setup and have a few follow-up questions. I just replaced the battery last week, after finding that the lead-acid battery from 2008 wouldn't hold a charge under a load. (I'm glad I figured that out before heading out on the water.) I upped the ante a bit, buying a dual-purpose marine battery which should do a good job.

                        Now, I'm considering adding a second battery so that we can listen to music out on the lake without worries about battery drain. We typically do a lot of waterskiing and wakeboarding, so the amount of time the boat would sit idle is pretty slim (i.e., an hour or two at most). Even given this, I think it would be worth the piece of mind to know that the stereo/other accessories weren't robbing us of sufficient juice to start the engine again.

                        I see the Borg Warner R3098 is still available on Amazon and at local auto parts stores. Is this still the best relay or is there a better alternative?
                        2004 X-10

                        186,000 miles per second - - - not just a good idea, it's the law.

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                        • It certainly isn't a bad choice but an easier installation would probably be a "add a battery" kit from Blue Seas. There's YouTube videos and all kinds of step by step instructions on how to do the installation in multiple locations.......

                          http://www.westmarine.com/webapp/wcs...1_10001_17208_

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                          • I'm about to order the parts to add a second battery to my Larsen (no, I'm not lucky enough to own a MasterCraft, this happens to be the best resource I've found on how to do it) but there is one thing that I have not seen clearly defined, which is with the single battery, I currently have 4 different cables plugging into each terminal... where do those 4 go when I add the second battery? Do I need to put the accessory only cables onto the 2nd deep cycle battery? Or do all 4 still plug into the main battery? Or do they go into the 2nd battery? The diagram on the first page is clear enough on how to wire the 2 batteries together, but it doesn't indicate what I do with the wires currently on the main battery.

                            Can anyone clarify this for me please? Thanks!

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                            • Originally posted by tilzinger View Post
                              I'm about to order the parts to add a second battery to my Larsen (no, I'm not lucky enough to own a MasterCraft, this happens to be the best resource I've found on how to do it) but there is one thing that I have not seen clearly defined, which is with the single battery, I currently have 4 different cables plugging into each terminal... where do those 4 go when I add the second battery? Do I need to put the accessory only cables onto the 2nd deep cycle battery? Or do all 4 still plug into the main battery? Or do they go into the 2nd battery? The diagram on the first page is clear enough on how to wire the 2 batteries together, but it doesn't indicate what I do with the wires currently on the main battery.

                              Can anyone clarify this for me please? Thanks!
                              That depends on what the four wires do, and what your intention is for the second battery. Let me start with the assumption that you're wanting to end up with a Starting Battery and a House/Accessories Battery, and that you want to be able to isolate the Starting Battery so that you can run accessories while the motor is off and still be able to start your boat.

                              If that's your goal then read on.

                              Assuming the accessories you want to run include your stereo and any amplifiers, your goal is to have these powered from the House Battery. If you have other accessories that you want to run while the boat is off, then you would relo these circuits to the second/house battery. What you will need to determine is what each of those four wires "do" in terms of providing power.

                              Let's start with the POS side of things:
                              One will go from the existing/starting battery to the starter and that remains.
                              One may also go to a circuit breaker/cutoff switch, which then leads to the main power block for ALL your other power needs (stereo, lights, etc.) via the fuse/breaker block. This would likely also remain "as is" but then you'll "remove" some accessories from being wired to the block and re-wire them to the house batt (see below).

                              As for the other two wires. . . you'll have to trace them unless you already know where they go/what they do. My guess is they are already providing power to some extras/accessories. . . or one set could be if you have onboard battery charger/maintainer.

                              Your ultimate goal is to wire to the house battery all the accessories (stereo, amps, lighting) that you want to use with the motor off so you're not draining the start batt.

                              At the breaker/fuse block, you'll need to determine what terminals are feeding your stereo/amps (if any) and pull these from the block so that you can wire them to the HOUSE battery. You WILL want to have these connections fused/protected.

                              I hope this helps a bit. I'll be around this weekend (well, on the boat) but if you want to talk via phone, PM me your number and perhaps I can help you.
                              "This one goes to eleven." 2007 ProStar 197 TT w/MCX and Powerslot.

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                              • Thanks for the info, its kind of what I assumed, and yes you're correct that I'm mainly looking to use the house battery for the stereo and amp. I'm guessing the breaker/fuse block is the 90amp fuse off the starter that I actually blew last week and had to replace already

                                It might be fairly easy to locate which wires do what, b/c when I blew the 90amp fuse I could still turn on the bilge, blower, and raise/lower the prop, but turning the key left/right didn't do a thing, and obviously the stereo didn't work either. So there appears to be a separation in the wiring already, I just need to figure out what goes to what.

                                One may also go to a circuit breaker/cutoff switch, which then leads to the main power block for ALL your other power needs (stereo, lights, etc.) via the fuse/breaker block. This would likely also remain "as is" but then you'll "remove" some accessories from being wired to the block and re-wire them to the house batt (see below).
                                This has me worried because when the fuse was blown I couldn't start the boat or use the stereo, so one wire on the breaker is serving both purposes it seems.

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