2nd battery inside !

[exosteve]

sounds like a fun project.

 

[makeitfit]

51 mm more than enough but it must go up hill all the way, no droops 22 mm is much more than enough and easier to run, Rick

Nice big voids in the side panels Rick. I don't mind over egging this gas mix thing :lol

 

[Lazy-Ferret]

Just to throw a spanner in the works, I thought the problem was there are two gasses given off, normally, Hydrogen, which is lighter than air, and as long as there is airflow over the battery, disperses very easily, but the more dangerous gas is hydrogen sulphide, which is heavier than air and can build up very quickly if the fluid levels on the battery fall, or the battery is over charged.

I think I would box it, put a vent pipe out, and either put a fan blowing ito the box, to create a positive pressure, or run a pipe to the snorkel, and use the turbo to pull out any bad gasses, which will also give you more power as you burn the hydrogen...LOL

 

[Lazy-Ferret]

Just to throw a spanner in the works, I thought the problem was there are two gasses given off, normally, Hydrogen, which is lighter than air, and as long as there is airflow over the battery, disperses very easily, but the more dangerous gas is hydrogen sulphide, which is heavier than air and can build up very quickly if the fluid levels on the battery fall, or the battery is over charged.

I think I would box it, put a vent pipe out, and either put a fan blowing into the box, to create a positive pressure, or run a pipe to the snorkel, and use the turbo to pull out any bad gasses, which will also give you more power as you burn the hydrogen...LOL

 

[rustic]

For that particular battery, there are two vent holes, one each side middle at the top, you can see it. 4-5mm diameter...
Vent kits for leisure batteries usually consist of a pipe, similar to screen wash pipe, and vented through say a caravan floor.
With my boat batteries, I connected a pipe to each side, "T" them together and vented it into the well ventilated outboard engine well.
Having said that, we can only charge at 10 amps, and our consumption is low, so we don't expect excess gassing.
If you are likely to go throgh deep water, you might want to consider where the vent goes.
:thumb2

 

[jims-terrano]

Well spotted Rustic, so can the tube be routed up to the rear vent like Pete was planning then I wonder. Would the tube evacuate enough gas produced by faster charge and discharge rates?

Also another thought, wont there still be plenty holes for water to get in anyway?

 

[rayf3262]

You could try something like this:
Relay 1 will connect and charge the aux battery whenever the engine is running.
Relay 2 will disconnect the charging circuit whenever the winch motor is running.
Has the advantage of not running high current cable between the batteries.

 

[rustic]

You could try something like this:
Relay 1 will connect and charge the aux battery whenever the engine is running.
Relay 2 will disconnect the charging circuit whenever the winch motor is running.
Has the advantage of not running high current cable between the batteries.

Slight problem with that circuit is...

AS you are cranking, the oil pressure light will go out, before the engine has actually started and as soon as it does go out, it will immediately take current from the second battery, so if the engine is a slow starter... then the 30 Amp fuse will blow.

Better to feed the first relay from the "Radio" feed as the radio is disconnected when the engine is actually cranking.
This is how I wired my second battery.
:thumb2

It works too.:thumb2
I also have a starter solenoid switch, as used on the 70's cars, so if I push a button in the cab... it links both battery positives :together via 25mm2 cable, as an extra boost on a cold day if required.



Rustic
Sorry pic is upside down, but you can see my solenoid, and second battery.

 

[rayf3262]

Slight problem with that circuit is...

AS you are cranking, the oil pressure light will go out, before the engine has actually started and as soon as it does go out, it will immediately take current from the second battery, so if the engine is a slow starter... then the 30 Amp fuse will blow.

Better to feed the first relay from the "Radio" feed as the radio is disconnected when the engine is actually cranking.
This is how I wired my second battery.
:thumb2

Good point, I had originally marked it up with a voltage sensing relay, which would be ideal, but was trying to think of an easy parts to hand solution. If the radio feed switches as you say then happy days, that is the way to go.

 

[Lazy-Ferret]

I took my relay feed from the Alternator energising/light wire. That way it only stitches on when the Engine is physically running fast enough to generate.

 

[kitchenman]

I took my relay feed from the Alternator energising/light wire. That way it only stitches on when the Engine is physically running fast enough to generate.

Me too

 

[Banshee]

I'm some next kind if wasted at the minute Pete believe me...... Ask Panelbeaterrrrrrrrrrr

But even I can tell that's just pure dan1gerous lol

 

[AlexD333]

I'm some next kind if wasted at the minute Pete believe me...... Ask Panelbeaterrrrrrrrrrr

But even I can tell that's just pure dan1gerous lol

Oh dear :freak3: :lol

 

[Banshee]

Hahahaha

 

[Thomas-the-Terrano2]

had leisure batteries that came with small diameter hose, agreed in picture of battery the vents are on the side, upper edge. should be easy to route out of truck.

 

[makeitfit]

Update

Just reviving this thread as I'm back on the 2nd battery install :thumb2
Just for good housekeeping I'll put the recent pics here and then expand again as I go
Here's the floor repairs done prior to battery tray going in.

Folded some steel to the contours of the floor , then applied my dodgeywelding skills to fix in place. Blew a hole or two and had to ask the boy for some bridging skills :doh

The ply divider will be tiger sealed all round to make the battery box .
There's a convenient hole there too for some venting

More to follow

 

[makeitfit]

Update

Did a bit more to the 2nd battery thing.
Fitted a volt sensing solenoid in the end as it seemed so much easier than multiple relays.
Then there's the winch solenoid and remote sender .
Rear winch socket is mounted just above offside rear lights . I then made a mini loom for it and that's all tied down safe n sound

Got to get some more battery cable size swages to wire up the winch.
Nearly there and then I get to put the floor in

 

[solarman216]

See you are still breathing propane then Pete, Rick

 

[makeitfit]

And another thing; I've run 6mm2 cable( it was available :augie ) from the start battery to the VSR . Cable length is 4m . What's the max size fuse I can put in there ?

 

[makeitfit]

See you are still breathing propane then Pete, Rick

Well the old engine is :sly