max batt size for dual battery setup in a 300tdi defender?

**cameron** · 23rd January 2006, 06:02 PM

Hi team,
The aux battery in my dual battery set up on my 300tdi defender seems to be pretty much cactus.

Two reasons here:
1. the low voltage cutout we madre up from a kit was set too low and;
2. I ran too much current through it (the low voltage cutout) - turns out to have only been rated to 5 amps - and so it sort of melted some of the wiring.

I have bought a ready made one now which should give me better service for the car and the original one is getting refurbed by a mate and I will bung it into my camper trailer.

At the end of the day the aux batt seems to have been drained too much too often and for too long a period of time.

Anyway if I am going to replace the aux battery then I want to get one with the biggest capacity for auxillary use that I can squeeze into the under seat box.

What I have now is:
The starter batt is a Yuasa Overlander NS7OZ RC115 and the clapped out aux is currently an Eagle NS5OP 11 plate RC85 (with a battery hold down on the base that is exactly suited to this battery)

I got the setup I have from a mobile accessory fitter guy when I first bought the truck and it worked fine and he insisted that it was the biggest that you could go for with a defender but now of course I know more and want more.

What can you recommend please?

I will be shifting most of the other wiring and stuff over to the drivers side seat box (no computer under there as it is a 300tdi) as that is where the compressor etc is now mounted.

At the moment the starter battery is an optima (from memory) which has been doing great. The current layout in there is the starter battery is running lengthways and the aux battery in its own holder is running acrossways.

Thus I am probably also looking for a new battery holder as well which will get it all in there and make the most of what space there is.

Ideas please guys?

Thanks in advance,
Cameron

**Reads90** · 23rd January 2006, 08:28 PM

This is what i have in my 300TDi 90. Same battery compartment as 110.
I had the optima already but got ARB to put the other battery with a split charge system

**hiline** · 23rd January 2006, 09:47 PM

cameron send drivesafe a PM

he will give you all the info your after

**DEFENDERZOOK** · 23rd January 2006, 10:06 PM

<span style="color:blue">if you have space under the drivers seat.....why not fit a third battery....?</span>

**weeds** · 24th January 2006, 07:58 AM

i remember seeing pics on here of three optima's under the pass seat, twop deep cycle and a start

**Reads90** · 24th January 2006, 06:40 PM

Originally posted by weeds
i remember seeing pics on here of three optima's under the pass seat, twop deep cycle and a start

Yeah we used to do that in the uk

**cameron** · 25th January 2006, 02:07 PM

[quote=DEFENDERZOOK]<span style="color:blue">if you have space under the drivers seat.....why not fit a third battery....?</span>

Hey Tony,
Can't do that cause under the drivers seat I have:
1. a few of the bits from the mobile phone handsfree unit;
2. a bushranger max air compressor plumbed into a pressure tank under the vehicle bolted to the chasis rail under the drivers seat;
3. a sureflo pressure pump currently being hooked up to the new helton heat exchanger under the bonnet for the shower.

So only really enough room to run a nice big cable and shift some of the spaghetti and fuses across to clear out a bit of room for a new, bigger aux battery.

Can anyone recomend a battery cradle too that will do the job well and hold both batts down in the best configuration?

Also I was after (and I will pm drivesafe thanks inc) amp hours and most importantly physical dimensions.

Cheers,
Cameron

**matbor** · 25th January 2006, 02:23 PM

Most battery manufactures have there specs listed on there websites, for example check out the specs of the Supercharge batteries here :
http://www.supercharge.com.au/products_specs_deep.htm

Matt.

**cameron** · 25th January 2006, 03:24 PM

Hi Matt,
Thanks for that - I have been reading with interest on the forum over the last month or so the good info about the SuperCharge batteries (and the forum discount!) and was thinking one might be the go. Bit of a drive to get out there to get one though and I don't yet know which battery would be the biggest and best for the job.

As for the specs I will pull it all out and measure everything up etc if I have to but was kinda hoping that some kind soul who already knew all there is to know about it might save me the trouble of trying to work it all out - I am looking for an already proved, successful selection hopefully

It isn't exactly an even dimensioned box under there sloping down at the back and with some bits deeper and wider than others. I don't want to go chopping up the top edges of the battery box in order to shoehorn something in and then have to make up a new lid.

Also the rain stopped long enough for me to go out and check what my current batteries are and I have edited the previous post to make it correct.

Details are:
The starter batt I have under there at the moment is a Yuasa Overlander NS7OZ RC115 (still going very well) and the clapped out aux is currently an Eagle NS5OP 11 plate RC85 (with a battery hold down on the base that is exactly suited to this battery so unlikely to be much use for a bigger sized battery unless it is as wide as the Eagle is long!)

Thanks guys,
Cameron

**weeds** · 25th January 2006, 03:47 PM

one of my aux batteroes is 120amp/h, i will measure up and get the brand make tonight

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