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  • Second battery location

    G'day all,
    I'm very close to fitting a second battery to support the fridge and other accessories. I would like to know what are the problems ( if any ) in having it located in the back of the Prado. I understand that the cable size needs to be substancial, but are there issues charging it there. Should I be concerned by the gases being produced? Who else has done this, and are they happy with it. I would prefer not to put any more weight up front, but I'm also not kneen on gasing myself or blowing the arse of the truck off.
    Bazza.
    [i]I'd rather laugh with the sinners than cry with the saints![/i]

  • #2
    Re: Second battery location

    Originally posted by Bazza
    G'day all,
    I'm very close to fitting a second battery to support the fridge and other accessories. I would like to know what are the problems ( if any ) in having it located in the back of the Prado. I understand that the cable size needs to be substancial, but are there issues charging it there. Should I be concerned by the gases being produced? Who else has done this, and are they happy with it. I would prefer not to put any more weight up front, but I'm also not kneen on gasing myself or blowing the arse of the truck off.
    Bazza.
    i run 3 batteries.
    2 in the front and the third hidden in custom cargo drawers.
    yes you need to run heavier cable (8B&S is good) as long as your not running winch from this battery.
    you MUST use a sealed battery when stored in passenger areas. this will eliminate gasses and any battery acid drips.
    easy enough job
    [url=http://www.fuelly.com/driver/damonat/prado][img]http://www.fuelly.com/smallsig-metric/50578.png[/img][/url]

    Comment


    • #3
      Re: Second battery location

      don't risk it. If installing a battery inside the cabin, make sure it is a sealed unit, even if it is in one of those battery boxes.
      Black 2003, TD, GXL Prado

      Comment


      • #4
        Re: Second battery location

        Hi Bazza, for any battery cabling that is going from the engine bay to anywhere else in the vehicle or to a trailer or caravan, you need to run 6B&S cable, both positive and negative cables.

        Next, no matter what type of battery you use, you need to secure the battery in a battery box, and a standard plastic battery box is all that’s need.

        Type of battery, you can use any type of battery, including flooded wet cell batteries. While there are advantages to using sealed batteries, flooded wet cell batteries work just fine and no they will no gas to the point where you vehicle will blow up.

        A flooded wet cell can smell for for a minute or so if it is very low when you first start your day’s drive but that’s about it.

        If your flooded wet cell battery smells while your driving along, you need to top the electrolyte up with some water. If a sealed battery smells, and they do, you can throw it away because it’s most likely stuffed.

        Because of the long cable run, no matter how big the cable is, you are highly unlikely to over charge any form of battery, but if the rare situation occurs where you do have high charge voltages at the rear battery, a sealed battery is going to be stuffed way before a flooded wet cell battery is.

        Bazza, just pick the battery that suits you and/or your pocket.

        You need to fit short circuit protection at both ends of the cable run and if you use 6B&S cable, for the best all round protection, fit 50 amp automatic resetting circuit breakers. These will give you good protection and they are a Fit-&-Forget device.

        Comment


        • #5
          Re: Second battery location

          Also might be a good Idea to look into a Ranox (good post on here about it), it will compensate for the voltage drop on the long cable, and it can be setup to suit the type of battery you choose. As the others have stated, I wouldn't consider anything but a sealed battery for inside a car, battery acid is an ugly thing!!!!

          Matt
          2003 Prado Grande TD Auto Pearl White

          Comment


          • #6
            Re: Second battery location

            You need to think hard about how you will mount the battery. The recommended minimum restraint capacity for a battery mounted int he cabin is 10G. Assuming the battery is 30kg this equates to a restraint with a capacity of at least 300kg.

            Leachy
            EX-Prado Owner

            Comment


            • #7
              Re: Second battery location

              What is with this fanaticism with acid.

              For a starter, any battery mounted inside a cab should be secured in a battery box.

              So while these boxes, by their very design, have plenty of venting hole and the likes, to have acid spraying all round the cab, you first have to be involved in a collision of such force that not only is the battery box destroyed, and the battery shattered, then the acid needs to be thrown around.

              For a collision, accident, rollover, what ever, to be that violent, I think any occupants of this vehicle would have already passed on to the next life.

              Please a reality check folks, just think of how much of the vehicle needs to be crushed before you even get to the battery box.

              One more point, even with low charging voltages, you really need to check just how viable these DC to DC devices really are and not just take the word of those flogging them.

              In the vast majority of cases, NOT ALL but most, if you take in all factors involved with charging a battery in the rear of a vehicle, it is highly unlikely that these devices will genuinely do a better job than your vehicle’s alternator can do.

              There is a hell of a lot more to it then just add a DC to DC device and all is done.

              Comment


              • #8
                Re: Second battery location

                Originally posted by drivesafe
                What is with this fanaticism with acid.

                Not sure, but I do like to "drive safely"
                Black 2003, TD, GXL Prado

                Comment


                • #9
                  Re: Second battery location

                  Dear Drive Safe. I would not under any circumstances be installing a wet cell battery in the interior of my Prado. Acid does and will leak out. A year or so back some one posted some pics of their 'rado that they rolled on a steep slope beside a gravel road. The thing cart wheeled and was written off. The occupants walked away. I watched a 'cruiser just recently gently tip onto its side at a 4x4 park. Imagine the contents of your battery leaking out all over the interior of your fourby and yourself. I would not want my kids sprayed with sulphuric acid.
                  We had a race car that I had just finished building some years ago. We took it out for a shakedown and to run in the new motor. I used a spare wet cell battery until the AGM battery turned up. At the end of the day (night)all appeared ok in the engine bay. The next day I had a good look at the car and discovered acid had spilled out of the battery. There was a good 10 or so mils in the bottom of the tray and the acid that had escaped destroyed the clear coat over the paint.
                  Baz, there are many battery types to choose from plus a few mounting options as well. Have a look at mounting a battery up under the rear bumper or floor somewhere. There is plenty of room for a sealed battery under there. Access may be a little difficult and you would need to ensure that the battery is rock solid and the terminals are well protected. Battery boxes are ok but the straps that are supplied are a little flimsy. I would replace this with something a little more substantial. Remember Mark Winterbottoms Ford at Bathurst that caught fire? He had a battery replaced during a pitstop and his crew had not secured the battery properly. They just use a cheap strap with a spring loaded buckle. His battery broke free and the short circuiting battery terminals resulted in disaster (again).
                  To sufficiently charge a battery you need a good 13.5 volts or more. Even higher voltages are required to stop sulphation. The cables resistance and the resulting voltage drop at the end of a set of long battery leads will not give a battery a decent charge. You also risk severly shortening the life of you new deep cycle battery.
                  150 Vx D4D, Deluxe Arb bar, winch, Hayman Reece Towbar, UBP, P3 Tekonsha, 'n stuff.
                  "When cooking on a camp fire it must be cool enough to cook on so it needs to burn down to coals, at least in parts. It is customary to drink beer while waiting for the fire to cool down.
                  I recommend starting with a very big fire"-Vince.

                  Comment


                  • #10
                    Re: Second battery location

                    So mumstruk, all the years before sealed batteries came along, when people had nothing else but standard flooded wet cell batteries in their vehicles, there were heaps of people that got covered in battery acid.

                    Actually I can not remember on single case where any body was ever hurt because of battery acid flying around the cab.

                    Don’t get me wrong it has happened, just not the on a frequent basis as some would have you believe

                    For many decades, there have been hundreds of thousands of vehicle with not just auxiliary batteries but cranking batteries mounted inside the cab and how many of these vehicle, even when involved in accidents, have resulted in people being covered in battery acid.

                    If you want to do some scare mongering, why not condemn having batteries of any form, mounted inside the cab because if an accident is that severe that a battery is damaged, then there is far,FAR more likelihood of the battery being torn out of it’s mount and becoming a missile, and in this case it wouldn’t matter what type of battery it was.

                    Now to your claim that you need 13.5v or more is needed to charge a battery.

                    Have you ever actually tried charging a battery with 13.2v?

                    I’ve carried out numerous test and experiments and have not had problems charging batteries to at least 95% SoC using no more than 13.2v, so what do you base your theory on.

                    Higher voltages will charge batteries quicker but are not mandatory.

                    Furthermore, your statement about higher voltages are required to stop sulfation in the context your were covering, charging batteries, is wrong.

                    For sulfation to occur in a battery, all chemical reaction must have stopped.

                    If there is any form of load or charge applied to a battery, there will be a chemical reaction and once the load or charge is removed it can take many hours before the chemical reaction stops.

                    So even if a battery is low, the battery doesn’t need a charge for a chemical reaction, if there is any form of load on the battery, sulfation will not occur.

                    What you might be getting mixed up with is that flooded wet cell batteries can have mild sulfation reversed by applying a high voltage for short periods of time, up 16V. This is known as a boost or equalising charge.

                    Comment


                    • #11
                      Re: Second battery location

                      It's good to have a healthly debate on this matter, but just like historically it was ok to carry jerry cans inside the vehicle and on the rear of the vehicle, you did so at your own peril. Now the law prohibits this (in NSW anyway). I guess it comes down to individual preferences and how risk averse you are. I for one don't like the idea of acid batteries inside the car. Right or wrong, it's my choice. Drivesafe, I respect your decision and will not argue with you if you choose to carry them on board, but I won't.
                      Black 2003, TD, GXL Prado

                      Comment


                      • #12
                        Re: Second battery location

                        Originally posted by Prado BB
                        ........ but just like historically it was ok to carry jerry cans inside the vehicle and on the rear of the vehicle, you did so at your own peril. Now the law prohibits this (in NSW anyway).....
                        I used to do this in one of my cars on long trips up bush. What was I thinking back then?

                        Anyhoo I look at it this way: If there is a battery inside the cabin area of my car it's got to be sealed, end of story. You never know what might happen or where you may be hit in an accident. I know I've copped a few whacks in the rear quater in my years of driving. After being bashed around the ears for years by safety guru's I'd like to think that having a wet cell non-sealed battery in the cabin area poses a risk to any occupant in that vehicle.

                        I also have a new Commodore V8 wagon and due to the engine bay being extremely tight (and to help with the weight and balance say Holden) the battery is in the rear of the car. Guess what? It looks like a sealed battery to me :shock: To me that is proof that if a car comes from factory with a sealed battery in the cabin, then that's what I'm doing too!
                        Regards,

                        Big Fella

                        2007 Prado GXL D-4D Auto. Black. Cooper ATR's, ARB Bull Bar, Safari Snorkel, ARB Dual Battery, Sandgrabba Mats, Black Duck Seat Covers, Plastic Bits on the front, Mesh Grill Guard, Tinted Front Windows, Towbar, Reverse Sensors, Lightforce Blitz 240's, ORS Drawer System. ScanguageII, Stebel Truck Horn, Icom 440 UHF Radio and BIlstein/Ridepro Premium Lift Kit.

                        If you can't fix it with a hammer...... you have an electrical problem.

                        [img]http://img.photobucket.com/albums/v655/pradovx96/Web%20photos/emailsig.jpg[/img]

                        Comment


                        • #13
                          Re: Second battery location

                          hi again Prado BB and Big Fella, I completely agree with you about it being your choice but what I’ve been posting is that your augment that these batteries pose a risk of acid being thrown around a cab in the advent of an accident is based on an unsubstantiated OPINION and if we were all honest, the carrying of ANY type of battery should be banned as there is a much, MUCH greater chance of being harmed by a battery being torn from it’s mounting and flying around the cab.

                          So what’s your opinion of banning batteries of all forms from the cab in the first place.

                          By the way Big Fella, what does the sticker near the battery in your Commodore say about replacing the battery?

                          Comment


                          • #14
                            Re: Second battery location

                            Guys,
                            Thanks for all your replys. I must admit, I'm starting to re-think this. It seems that the chance of cracking the inner guard may be less of a risk than the problems associated with mounting a battery in the back. My intention was to mount a battery in a marine type plastic box, and have it secured to one side of my fridge/slide/deck. I dont think I'll be rushing into this.
                            Thanks guys.
                            Bazza.
                            [i]I'd rather laugh with the sinners than cry with the saints![/i]

                            Comment


                            • #15
                              Re: Second battery location

                              Hi Bazza, do what ever you think suits your needs and you will find there are plenty of others who have done either set up.

                              Mounting a battery in the rear cargo area is by far the better location, if you have the space available, because it means you can use any type of battery and a plastic battery box is all you need to make the installation safe.

                              The engine bay mount will limit the type of batteries you can use but will make more space available in the rear cargo area.

                              So there are advantages either way.

                              Comment

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