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The 150 series Dual Battery Guide

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  • Hi Ben and if you are mounting a battery in the rear of your vehicle, no matter what type of battery it is, the battery’s internal resistance combined wire the cabling resistance and length, will act as a quasi voltage/current regulator and you will never cook a battery while charging from your alternator.

    It’s actually quite a safe way to charge any battery, even when alternator voltages can be in the mid 15v in some makes of vehicles.

    So just fit and forget.

    Comment


    • When charging batteries in a dual battery system linked by an electronic isolator should the batteries be charged separately? Also should vent caps be on or off (batteries are wet cell)?

      Comment


      • Originally posted by fido666 View Post
        When charging batteries in a dual battery system linked by an electronic isolator should the batteries be charged separately? Also should vent caps be on or off (batteries are wet cell)?
        I presume you mean when charging with a 240v charger?

        When preparing for a trip I will regularly hook a battery charger up to my camper trailer battery, that feeds directly to the crank battery through the Anderson plug, once the voltage allows the isolator to connect the second battery that gets a charge as well. I've done this heaps of times no problems at all.

        I never remove the caps, you don't remove them when the alternator charges you battery when driving so cant see the point.

        Cheers Andrew
        [COLOR="#FF0000"]So Long and Thanks for all the Fish![/COLOR]

        [url=http://www.4wdadventurers.com/showthread.php?3840-AJ-s-120-Prado]MY PRADO AND DIY CAMPER TRAILER[/url]

        [url=http://www.4wdadventurers.com/showthread.php?3975-AJ-s-79-series-Cruiser-Ute]MY HZJ79 Landcrusier[/url]


        [SIGPIC][/SIGPIC]

        Comment


        • Originally posted by AJ120 View Post
          I presume you mean when charging with a 240v charger?
          Yes, charging off 240v.

          once the voltage allows the isolator to connect the second battery that gets a charge as well. I've done this heaps of times no problems at all.
          OK, so I can just hook the charger up to the main battery and let the isolator switch to the aux? No need to disconnect the battery cables?

          I never remove the caps, you don't remove them when the alternator charges you battery when driving so cant see the point.
          The instructions do say to refit the vent caps after topping up with distilled water, was just checking as I do know that lead acid batteries may produce gases.

          Comment


          • I hook the charger up to the rear Anderson plug. Charges the auxiliary battery then the isolator clicks in and charges the main. I give no care that one is calcium and one is gel. I like to live on the edge but with fully charged batteries!

            Cheers Brad.
            [B]2010 GX ,D4D, 6 Speed Manual.[/B] 17x7.5'' +15 FJ Cruiser alloys, 265/70/17 Cooper ST MAXX, ARB bar, Tigerz11 winch, 2'' Dobbinsons lift, Superior front swaybar spacers, extended rear swaybar links, dual batteries, 65L Waeco, custom rear storage, cargo barrier, Fuel Manager pre-filter, breathers, UHF, Narva driving lights.

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            • Yes they give off gas but the caps have vents.

              Cheers Andrew
              [COLOR="#FF0000"]So Long and Thanks for all the Fish![/COLOR]

              [url=http://www.4wdadventurers.com/showthread.php?3840-AJ-s-120-Prado]MY PRADO AND DIY CAMPER TRAILER[/url]

              [url=http://www.4wdadventurers.com/showthread.php?3975-AJ-s-79-series-Cruiser-Ute]MY HZJ79 Landcrusier[/url]


              [SIGPIC][/SIGPIC]

              Comment


              • My son took the 90 series (circa 1996) to Philip Island for some concert thing.

                I had removed the wiring for the fridge, but I bought him wire and fuse and let him do it himself. NO back up except for jumper leads though ....

                He ran the motor during the weekend too ...

                Of course, the motor wouldn't start! The battery was dead ...

                He jumpered it - no problems. Then went to his girlfriend's parents spare place in Warragul area ... and it wouldn't start!!

                No RACV coverage on that vehicle either ... no red light in the dash (hence alternator should be OK) ... no swollen battery (an 18 month old 66 AH Optima so still under warranty), and the casing appeared fine ...

                Thanks to this thread, I thought it through and suggested he check how tight the wiring was ... it was a bit loose, and when tightened, the motor started fine!!

                Glad I got him to do it ... he learn't something I reckon ...

                Comment


                • Dumb Question but...

                  So let me start off by saying I have no electronical knowledge at all so this will most likely be a dumb question but... I had ARB install a duel battery system in my new prado but they didn't really explain how to use it... Question 1: Does the ignition need to be on to use the second battery or is it on all the time? Question 2: I have attached a pic of a button that ARB installed and have no idea what it does...

                  Sorry in advance for my cluelessness.
                  Attached Files

                  Comment


                  • It is on all the time for running your fridge while the car is parked up.
                    The button might be to jump start your car off the second battery if your main battery goes flat. Is it a push in button that springs back when you let go?


                    Sent from my iPad using Tapatalk
                    Cheers
                    Blake

                    04 Silver Diesel GXL with lots of stuff
                    [SIGPIC][/SIGPIC]

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                    • At a guess I would say it is to link the batteries should your starter battery go flat. I would have thought it would at least be labeled
                      Blue Storm 150 D4D GXL, Toyota Tow Bar, Cheepo floor mats, Tough Dog Springs & Shocks, Colour Coded TJM T13 steel bar, KingOne winch with rope, GME 3440 80 channel uhf. Not allowed to make hole for snorkel - yet..

                      Comment


                      • Yeah it pushes in and springs back. Makes a clicking noise in the engine bay when it's pushed in...

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                        • The auxiliary battery charges when the engine is running, you would normally connected all your
                          accessories to the auxiliary battery so in this case it is always on.
                          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

                          Comment


                          • maybe, maybe not?
                            I didn't think that the BCDC1220 had an override, maybe there is an SBI12 (or similar continuous duty solenoid in the play)?

                            Please correct me if I am wrong.

                            Comment


                            • Isiman I have no idea what you said?? Is the button for start the car from the auxiliary? From what people are saying, the auxiliary is on permanently so any accessories will work even when car is off?

                              Comment


                              • Is it the switch to select what the battery type is for the BCDC1220 charger? When you push it, check the LED lights on the BCDC1220. Does it change to another battery type?

                                Comment

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