dual battery wiring and mounting help.

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Originally Posted by rottodiver

np99 what size?? and also considering the thickness of the cable i guess it would have to be a circuit breaker?
Scotty

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The circuit breakers are there just incase the main cable shorts to the body or chassis.

The size of the fuse or circuit breakers depends on the cable size used and to some degree what you plan on running from the rear battery.

If you have used 6B&S cable and are only running a fridge and some lights I would use 60amp circuit breakers.

You could easily go up to 80amp circuit breakers, the cable will handle this in normal operation.

The concern with going to high with the rating of the circuit breakers is if a partial short occurs it is possible that the current can slowly rise and the cable may overheat before the circuit break trips out.

mine is 25 mm squared cable!!!
to be honest i realise the importants of fuses and circuit breakers but have never thought to put one on these cables!!

Scotty

It's recommend to fuse due to the length of the cable and where you have to run it.

If you put the cable in conduit and have run it through the vehicle in a way that reduces the risk of it rubbing on any metal objects then you should be ok.

It's your call. The main battery cable that runs down to the starter motor is not fused.

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Originally Posted by Yendor

What brand controller is it?

There's more room on the passenger side, either in the kick panel or even up behind the back of the glovebox.

For a rear battery installation I would recommend using circuits breakers, one mounted as close as possible to the positive post of each battery as well as conduit over the cables.

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its a projecta electronic controller. Hmm so i will need breakers damn oh well better get searching for some was hoping to just put it together as is. The kit never supplied a fuse or breaker.

I also suggested having the controller on the drivers side as then if i was to get a flat battery on my own i could easily reach the button on the controller to jumpstart the car and be able to turn the key at the same time.

Would something like this do http://www.ebay.com.au/itm/12V-DC-CA...ht_2883wt_1271

I always had my dual battery in my .GQ under the bonnet so I am not sure why yours won't fit

I would think that it would be a real pain to have it in the back with all the other gear you have to fit

There are new style battery trays so you can mount them along the chassis underneath.....not my preffered option buy frees up space in the rear

Mic

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Originally Posted by BLKWDW

its a projecta electronic controller. Hmm so i will need breakers damn oh well better get searching for some was hoping to just put it together as is. The kit never supplied a fuse or breaker.

I also suggested having the controller on the drivers side as then if i was to get a flat battery on my own i could easily reach the button on the controller to jumpstart the car and be able to turn the key at the same time.

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I not familiar with Projecta. The quick google search I just did, states that you don't need to hold down the button on the controller to jump start, you just press it and the batteries will remain link as long as the starting battery is above 6 volts.

Did you get instructions with the unit? If the above is correct for your controller you are better off mounting the unit as close as possible to your main battery.

Doing this, they claim you don't need to fuse the cable coming from the main battery because their controller has current limiting protection.

They do advise to fuse the cable at the second battery. It looks like their kit supplies a fuse as part of the battery terminal for the second battery, did you get this in your kit?

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Originally Posted by happygtu

I always had my dual battery in my .GQ under the bonnet so I am not sure why yours won't fit

I would think that it would be a real pain to have it in the back with all the other gear you have to fit

There are new style battery trays so you can mount them along the chassis underneath.....not my preffered option buy frees up space in the rear

Mic

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the height of the battery is the issue as it fouls on the bonnet. Fitting in the rear wont be a problem. All i usually carry in the back is a fridge and tool box. once i get a few more parts for the install i'll make a false floor in the back having the fridge on a slide one side and the other a long draw for tools recovery equipment etc. Maybe some extra storage on the sides. Battery setup will fit behind the fridge in its own box out of the way. I dont need to fill the back of the car for trips as i have my camper trailer for that. All i need for day trips is fridge, tools and recovery gear.

G,day Yendor,
Did you look at the link blkwdw posted for the fuse, after reading what you wrote I think I will install something that and being that I would not need to get terminals crimped on the cable it looks like it will be a matter of just cutting the battery cable and installing it in line!!
Scotty

Quote:

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Originally Posted by Yendor

I not familiar with Projecta. The quick google search I just did, states that you don't need to hold down the button on the controller to jump start, you just press it and the batteries will remain link as long as the starting battery is above 6 volts.

Did you get instructions with the unit? If the above is correct for your controller you are better off mounting the unit as close as possible to your main battery.

Doing this, they claim you don't need to fuse the cable coming from the main battery because their controller has current limiting protection.

They do advise to fuse the cable at the second battery. It looks like their kit supplies a fuse as part of the battery terminal for the second battery, did you get this in your kit?

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This is the kit i have. http://www.ebay.com.au/itm/PROJECTA-...ht_7992wt_1037

I realise getting it as close to the main battery as possible is best but there wire they supplied and the wire i bought doesnt reach the battery properly in the rear from the controller in the engine bay it get just behind the rear seat. If i have to bite the bullet i will buy longer wire but i was hoping to see if i could get away with using the 2 wires i already have. If i was to mount in the cab the closest place to the battery would be i the drivers side somewhere.