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Thread: Dual battery system

  1. #41
    Join Date
    Mar 2016
    Location
    Perth
    Posts
    1,637
    Quote Originally Posted by W&KO View Post
    How is his battery going to suffer and why will he be replacing batteries more often??
    Because the charging regime selected is based on the cranking batteryís charge state. If both batteries are discharged together then the BMS will apply higher voltage to increase charging to the cranking which benefits both batteries. If the cranking is full, then the drain of the other battery is perceived as only a parasitic load and not a battery that needs charging. This will see lower voltage applied and slower charging of the secondary battery. This in turn can see it always partially charged hurting itís life.
    Traxide and other that deplete the cranking battery work in the secondary batteryís favour.
    2010 TDV6 3.0L Discovery 4 HSE
    2007 Audi RS4 (B7)

  2. #42
    Join Date
    Apr 2019
    Location
    Brisbane
    Posts
    113
    Quote Originally Posted by DiscoJeffster View Post
    Because the charging regime selected is based on the cranking batteryís charge state. If both batteries are discharged together then the BMS will apply higher voltage to increase charging to the cranking which benefits both batteries. If the cranking is full, then the drain of the other battery is perceived as only a parasitic load and not a battery that needs charging. This will see lower voltage applied and slower charging of the secondary battery. This in turn can see it always partially charged hurting itís life.
    Traxide and other that deplete the cranking battery work in the secondary batteryís favour.
    Iíve ever had any issue over the last 20 years.

  3. #43
    Join Date
    Apr 2016
    Location
    Mona Vale
    Posts
    500
    Quote Originally Posted by DiscoMick View Post
    Whatever system you choose, I recommend you add a solar panel on your roof rack to keep it topped up. Set and forget.
    Thanks but the roof isnít an option as Iíll plan on putting a large roof pod up there so that I can lock my surfboard on top.

    Ive never had a flat from the fridge from using just the main battery (Iíve come close!) so Iím confident the extra battery dedicated just for the fridge will do the trick.. time will tell
    2011 Fuji White D4 w/ facelift front and tail lights, 2016 front bumper and grill.
    Black Pack interior trim - CB - Waeco Fridge - 3 Way Lift Rods - Rock Sliders - Pirelli ATR Plus 265/60/18. Nanocom Evo
    Northern Beaches Syd.

  4. #44
    Join Date
    Apr 2016
    Location
    Mona Vale
    Posts
    500
    To close this out.. I ended up with the Narva voltage sensitive relay, front runner battery tray and optima yellow top.

    Hasnt been tested properly yet for how long I can run the fridge but The car seems to start better

    Total price $560

    battery - $305
    battery tray $115
    Narva VSR - $140
    2011 Fuji White D4 w/ facelift front and tail lights, 2016 front bumper and grill.
    Black Pack interior trim - CB - Waeco Fridge - 3 Way Lift Rods - Rock Sliders - Pirelli ATR Plus 265/60/18. Nanocom Evo
    Northern Beaches Syd.

  5. #45
    Join Date
    Oct 2014
    Location
    Brisbane
    Posts
    3,335
    Quote Originally Posted by Lukeis View Post
    To close this out
    It's not closed until there's photos

    Scott

  6. #46
    Join Date
    Aug 2018
    Location
    Canberra
    Posts
    67
    Because the Narva cuts out at 12.7v you have only the capacity of the yellow top to run your fridge. If your yellowtop is the d34 then it's 55amps which means you have a safe usable of about 45amps. This setup will require some careful management if your planning on stopping up any longer than 1 night.

  7. #47
    Join Date
    Jan 1970
    Location
    Queensland
    Posts
    6,774
    Hi Lukeis, and just a work of caution, when I started supplying my D4 kits, I originally supplied them with that battery tray.

    The tray actually comes from South Africa, and there was a problem with it.

    The bracket can touch and rub the plastic bottle just in front of the battery location.

    At the time I asked if the bracket could be modified, but as it was made for a specific purpose and they could not/would not change it.

    If it is still the same bracket, you will need to make sure it clears the plastic bottle.

    BTW, this is why we decided to make our own and make it out of stainless steel instead of painted steel.

  8. #48
    Join Date
    Jan 1970
    Location
    St Helena,Melbourne
    Posts
    12,925
    I paid about $200 less for my traxide and 85ah agm, so by skimping you spent more.
    MY08 TDV6 SE D3- permagrin ooh yeah !
    98 TDI AUTO SE DISCO - gone and will be missed.
    2003 Dingo offroad camper trailer
    1998 Triumph Daytona T595
    1974 VW Kombi bus
    1958 Holden FC special sedan

  9. #49
    Join Date
    Mar 2016
    Location
    Perth
    Posts
    1,637
    Quote Originally Posted by loanrangie View Post
    I paid about $200 less for my traxide and 85ah agm, so by skimping you spent more.
    Really? $360?
    2010 TDV6 3.0L Discovery 4 HSE
    2007 Audi RS4 (B7)

  10. #50
    Join Date
    Jan 1970
    Location
    St Helena,Melbourne
    Posts
    12,925
    Quote Originally Posted by DiscoJeffster View Post
    Really? $360?
    Yes, $330 to be exact. I already had the power and earth cable and twin core sheathed to run to the rear so even if you add $50 for that.
    MY08 TDV6 SE D3- permagrin ooh yeah !
    98 TDI AUTO SE DISCO - gone and will be missed.
    2003 Dingo offroad camper trailer
    1998 Triumph Daytona T595
    1974 VW Kombi bus
    1958 Holden FC special sedan

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