Dual battery setup for 2.8 1GD

[120D4D Avid PP Poster! Find all posts View Profile Close 120D4D]

A very nice touch indeed. I know my Redarc can't do that.

You need the dual sense model (SBI12D) for this option.

[dBC Member Find all posts View Profile Close dBC]

You need the dual sense model (SBI12D) for this option.

I meant my Redarc DCDC can't do it, or are you saying I can supplement it with an SBI12D somehow, to achieve the same result?

[drivesafe Senior Member Find all posts View Profile Close drivesafe]

You need the dual sense model (SBI12D) for this option.

Hi Michael and not sure if you are aware of it, but your isolator also has Reverse Charging.

[120D4D Avid PP Poster! Find all posts View Profile Close 120D4D]

I meant my Redarc DCDC can't do it, or are you saying I can supplement it with an SBI12D somehow, to achieve the same result?

Oh I was picturing the Isolator as they have two versions (single and dual sense) apologies.

[120D4D Avid PP Poster! Find all posts View Profile Close 120D4D]

Hi Michael and not sure if you are aware of it, but your isolator also has Reverse Charging.

Yes my SCI80 can certainly do it too - its convenient to attach a charger/solar panel to either battery and charge them both.

[irishgxl Lurker Find all posts View Profile Close irishgxl]

So after all this discussion has anyone narrowed down to whether you need a dcdc or can just use a standard vsr?

TIA

[404pug Avid PP Poster! Find all posts View Profile Close 404pug]

My 2016 2.8 works just fine with a $70 VSR to charge a 105 ah deep cycle battery with no issues at all.In fact the second battery seems to be better charged than the main one [ whose charge levels were in no way affected by fitting the VSR.]

[ferktm Lurker Find all posts View Profile Close ferktm]

I have installed a Redarc BCDC and works perfect. Aux battery charging voltage rises to 14,2-14,4 V while the OEM alternator doesn't offer much more than 13,3V.

[Gurilla Senior Member Find all posts View Profile Close Gurilla]

Thought I’d post here instead of making a new post, I ran a 6 b&s cable to the back of my car for a fridge from the aux battery, I was recommended from jay car to use a 70amp circuit breaker off the positive just after the battery ? Is this to large or is this fine ? The full length of the #6 cable is roughly 5 meters from engine bay to back wheel arch where a 50amp Anderson plug is, I had also cut off the cig plug on the Waeco and put a 50amp Anderson plug too? Is this fine or should I change any thing ?? The cable is also from Jaycar so assuming it’s a decently quality cable too?

[dezzert storm Junior Member Find all posts View Profile Close dezzert storm]

Yes my SCI80 can certainly do it too - its convenient to attach a charger/solar panel to either battery and charge them both.

Hi Michael, just wondering how you have found the SC80 a few years on. Seriously considering adding one of these to my recently purchased 2.8. Cheers

[Krich38 Lurker Find all posts View Profile Close Krich38]

Hello,
I want to install a dual battery. How hard is it for someone without much auto-electric knowledge? My ideal situation would be dual battery under the bonnet, outlet at the back for the fridge. I want to also have a USB (even the current one in the 2018 prado near the gear stick) to be wired to the dual battery for constant power supply. Has anyone had luck doing this? Can someone tell me what parts I need.

[Gurilla Senior Member Find all posts View Profile Close Gurilla]

I’ve never installed a dual battery before or done much electrical work to cars

but I did it in my 2018 prado hardest part for me was running 6b&s wiring from battery to rear as it’s so thick !

i got a plastic battery tray off eBay $15. Clamps from battery world, wiring,lugs and 70amp circuit breaker from jaycar.. think 70amp is little big for just a fridge ? But the 6b&s is rated to 100+amps

installed a Anderson plug in rear, cut off cig point on fridge and put Anderson too

I havnt installed a vsr or dcdc yet as we just do short trips and I charge the battery out of car but the 105ah last 3 days with the fridge If i pre cool it and the food/drinks few days before

simple install and when I need to install a dcdc everything else already done for me !

[Gurilla Senior Member Find all posts View Profile Close Gurilla]

I still can’t work out if I need a ign wire source for the dcdc ? After reading this

some people are saying the alt is temp sensor ??and don’t need it ? But does the car give out enough volts for the dcdc to turn on and off ??

i an Looking at a projector dcdc 25a Charger look to be good value



Says it will turn on 13.4v and turn off 12.8

also does this dcdc act as a isolator ? For example it will disconnect from main battery when off ? Or will it keep running off it until 12.8 and then disconnect ? If that makes sense ? All fridge etc will be ran off aux so only the power will run off aux even with car off ? Or will it draw off both batteries until 12.8? Or isolate the start and draw from the aux only

[LeighW Avid PP Poster! Find all posts View Profile Close LeighW]

Lowest you'll get is probably around 13.2V but keep in mind voltage drop across the cable to the DCDC so may get down to 13V for instance. If the DCDC can handle that then it should work. Just get one that has an ignition trigger and you can always connect it later if required.

[Gurilla Senior Member Find all posts View Profile Close Gurilla]

It has a ignition trigger on the projector

does anyone on here have one and has used it with out the ignition and any issues ?