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  • Rear Anderson without a dual battery setup

    Hi All...

    Maybe my SearchFu isn't up to scratch but I'm looking for info on running an anderson to the rear of the car without having to do a full dual Battery setup.

    Do I still need something like a redarc SBI12 to isolate the battery or can I just run it straight to the main battery (via 50A fuse)?

    I'm taking the outlaws van away over easter and I believe it has a DCDC charger built into the van.

    AB

  • #2
    You can just run a fused cable but it will depend on you disconnecting the plug manually when stopped for any period of time because typically a DC to DC charger set up in a van or camper doesn't run a separate trigger wire to tell the DC DC unit to shut down. My Tvan has the trigger wire connected to the main infeed so it will suck the main battery dry as long as it has 12V available.

    I have a 50A manual circuit breaker feeding an SBi12 which then runs to the Anderson plug. This way if we stop for a few hours I don't need to disconnect the Anderson plug to the camper. Your DC DC charger may have a trigger wire so best to check, if it doesn't I suggest a voltage sensitive relay like an SBi12.
    My 150 build - http://www.pradopoint.com/showthread.php?27423-A-Random-approach-to-a-Bluestorm-150-GXL-D4D-automatic

    Comment


    • #3
      I did have that setup before I installed the second battery. Manual cct breaker to feed the Anderson to the rear of the car. Trailer has a Ctek 250s. When I stopped I would pop the bonnet and hit the circuit breaker to ensure it didn't drain the main battery if only overnight. Longer periods I would just disconnect the trailer.

      Comment


      • #4
        Thanks guys,

        I think I'll just bite the bullet and install an SBI12 as I do plan to add a dual battery later so it won't be wasted.

        Comment


        • #5
          Originally posted by Audiobuzz View Post
          Thanks guys,

          I think I'll just bite the bullet and install an SBI12 as I do plan to add a dual battery later so it won't be wasted.
          Yes, it'll be more convenient for you and prevents the starter battery being drained unexpectedly.

          Comment


          • #6
            My current setup has the second battery being charged with an SBI12 protecting the main battery.

            The anderson plug to the rear runs off the second battery after running through a 50amp breaker. The caravan has a redarc 1240 charger looking after the caravan battery. The Redarc has input thresholds that means it is only activated if the Input Open Circuit voltage is above 13.2V and turns off when the Input Open Circuit voltage is below 12.7V.

            I now want to install a dcdc charger in the Prado to improve the charging of the second battery. I understand it is not a good practice to have 2 dcdc chargers in the same circuit so I am looking to run the anderson plug from the main battery.

            Given the input thresholds of the redarc in the caravan, do I need to provide an ignition switch in the anderson plug circuit to ensure it is isolated when the ignition is off or can I just run a fused line direct from the main battery to the anderson plug and rely on the caravan Redarc to protect the main battery?

            OR - should I run the fused line to the anderson plug from the SBI12 to provide further protection? That is, can I run both the feed for the second battery and the anderson plug from the SBI12?

            Harry
            [i][b]Voyager[/b][/i]

            Comment


            • #7
              No need for the dc to dc get one of these.

              http://www.ebay.com.au/itm/Alternato...AAAOSwsN9XC0gu
              ZR

              [url]http://www.pradopoint.com/showthread.php?28607-GUV-s-ZR[/url]

              Comment


              • #8
                Thanks GUV

                I already have a similar modified fuse but that only gives me voltage in the high 13s. You need at least 14.5v to successfully charge most deep cycle batteries - I have an Optima AGM in the Prado and Lithium Ferrous Phosphate in the van.

                Harry
                [i][b]Voyager[/b][/i]

                Comment


                • #9
                  You don't need 14.5V to fully charge an AGM, 13.8V will do it ok, high voltage just means quicker recharge times.

                  If you have purchased a low voltage version of the Redarc it should work fine in the van, the Redarc however is not the best unit to be charging Lithium's with, the charge voltage is too high as is the float voltage. The Enerdrive unit is a better buy as it allows custom profiles and doesn't "float" charge when set to LifePo4.

                  Depending on your setup I would also suggest you feed the DCDC off the VSR, you can then add a bypass switch to the DCDC charger, this will allow you to still put some charge into the Lithiums if the DCDC charger should fail, as well as allowing you to charge the car aux from the vans AC charger when in caravan parks etc, saves having to have a second charger for the cars aux if your running a fridge in the car etc.
                  LeighW
                  Avid PP Poster!
                  Last edited by LeighW; 19-03-2017, 04:49 PM.
                  HKB Electronics, manufacturer of the Alternator Voltage Booster, Silver 2008 D4D,Lifted,Underbody protection, Alternator Voltage Booster, Tiger Z winch, Lightforce DL, Air Horns, Tanami Drawers, Drop down fridge slide, Outback cargo barriers, Rotronics dual Battery system, Polaris GPS, HF/UHF/VHF, Radio speaker combiner, Long ranger water tank, Diff breathers, Inverter, Snorkel and others

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                  • #10
                    What Leigh ^ said, be careful with charging voltages if you are using lithium batteries.
                    My 150 build - http://www.pradopoint.com/showthread.php?27423-A-Random-approach-to-a-Bluestorm-150-GXL-D4D-automatic

                    Comment


                    • #11
                      Leigh and mjrandom

                      Thanks for the info. I am happy with the Redarc as the supplier of the LiFePO4 battery gave it the tick of approval. Redarc's Lithium version of the charger was not recommended as its float voltage was too high for the particular battery I have.

                      Given that the Redarc only charges the van battery when it is connected to the Prado, there is not the issue of having the charger on float for extended periods of time.

                      I like the idea of being able to charge back through van and will give that some more thought.

                      Regards

                      Harry
                      [i][b]Voyager[/b][/i]

                      Comment


                      • #12
                        Keep in mind a few years ago it was it was recommended to charge them to 14.6V or higher, then it dropped to 14.4V now as they know most don't want to replace their current chargers so they say you can get away with t gel setting of most chargers ie 14.2V as they want to sell you the batteries. The gel setting is a compromise you can get away with it but it most likely will shorten the life of the battery.

                        General consensus by those that have been using the LifePo4 for several years seems to be no higher than 14V, it will probably continue to drop as more user data is obtained.

                        If your going to buy a charger then it would be preferable to buy one with user settings, ie settable charge voltage, absorption timer and the ability to have no float charge just a return to charging when voltage drops to XX.X, the Enerdrive and some other high end units allow this, the Redarcs don't.

                        Also keep in mind some battery suppliers also want to sell you their cell balancers etc, these were designed when the Lithiums came out and generally require a high charge voltage to be able to do their thing, so there is a conflict of interest in that regard.
                        HKB Electronics, manufacturer of the Alternator Voltage Booster, Silver 2008 D4D,Lifted,Underbody protection, Alternator Voltage Booster, Tiger Z winch, Lightforce DL, Air Horns, Tanami Drawers, Drop down fridge slide, Outback cargo barriers, Rotronics dual Battery system, Polaris GPS, HF/UHF/VHF, Radio speaker combiner, Long ranger water tank, Diff breathers, Inverter, Snorkel and others

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