Battery Heat Shielding

[dom14]

Hey Guys,

I've been wondering whether we can inadvertently overdo with battery heat shielding?!!
I mean the idea of the heat shield is to protect the battery(particularly underbonnet aux battery) from exhaust heat, right?
But, do we need to get some right balance with the shielding material?
By that I meant, do we need to allow any heat generated inside the battery to dissipate to outside without the shield blocking the heat transfer?

Or am I talking nonsense?!

Just wondering.

Thanx

[Cuppa]

My view is that it makes sense to use a heat shield to protect the battery from direct heat from exhaust/turbo. Trying to keep it cooler than the ‘general ambient temp under the bonnet is not really practical unless battery can be positioned to be in the direct path of incoming airflow. With a heat shield you should ensure an air gap remains right around the battery. From time to time the notion of trying to insulate the battery is raised. I’d suggest that doing so will have a negative effect. The battery will just take a bit longer to warm up (from external sources), but once warm will take a lot longer to cool down again.

[mudski]

The GU's have a plastic shield that goes around the battery and a vent tube that runs from the shield and into the guard. Wonder if this could be implemented on a GQ?

[threedogs]

my AUX battery is a Trojan 115AH wet cell [more bang for your buck IMO]
I have run these batteries in all my 4x4, after first fitting it to the Patrol I did
have to check the level on a regular basis, I have a water kit fitted to the battery
which is a great idea.
Anyway the topic came up of under bonnet temps, then I realized the turbo was
affecting my AUX battery, so I fitted a turbo beanie and since that day my AUX
has remained topped up. Highly recommend one, as for the heat shield yes
great idea as it will allow airflow around the heat shield,
A lot of the duel fuel and 6.5 chev guys have no room under the bonnet for
an Aux battery and fit them either underneath or in the cargo area.

[BigRAWesty]

If your running an NA engine some sort of simple sheet metal shield with an air gap as cuppa has said is best. But I'd keep the front and back open. Some sorta air has to be coming past the light and air box and past the battery so allowing the flow along the battery would be best.

If your running a turbo setup or even extractors / headers then I'd suggest either a turbo beanie and / or wrap the manifold / exhaust / dump pipe with exhaust wrap..
Insulate the heat sorce and keep the heat in it.
Reduce those under bonnet temps and keep a happier battery.

[threedogs]

Kallens comment has jogged my memory [whats left] get your dump pipe etc ceramic coated.
Im not a fan of the wrap as it causes rust very quickly, but each to their own, just saying

[johno90]

Kallens comment has jogged my memory [whats left] get your dump pipe etc ceramic coated.
Im not a fan of the wrap as it causes rust very quickly, but each to their own, just saying

As an old v8 and turbo person this is 100% correct BUT there is some new wraps out now that are meant to prevent this, I'm about to fit a manifold and turbo blanket and wrap the dump in this new stuff so ill let you know how it goes.

[dom14]

The GU's have a plastic shield that goes around the battery and a vent tube that runs from the shield and into the guard. Wonder if this could be implemented on a GQ?

I've never looked inside a GU to know that's how it's designed. Thanx for the info mate.
I'm guessing vent is to vent out any hydrogen that might escape from unsealed batteries?!
I was wondering more about the direction of heat transfer(my latest "obsession". ;) )
I've never looked into battery chemistry enough to know whether some of them produce a reasonable amount of
internal heat that we need to take into account.
I guess, if there is such thing, car makers would've taken that into account, wouldn't they?!

Kinda been wondering whether it is an overkill to shield a cranker when we live in a relatively cooler climate.(i'm ignoring the hot summer of course).

[Brissieboy]

I'm guessing vent is to vent out any hydrogen that might escape from unsealed batteries?!

Nothing to do with the battery gasses. The plastic only goes around the sides, not the top.

[the evil twin]

Nothing to do with the battery gasses. The plastic only goes around the sides, not the top.

Yep... agree with BB

The placcy shroud has a lip at the top and an air gap between battery and shroud on the sides.

IIRC there is/should be a small flexible pipe about 2 inch dia connecting the placcy 'cover' to a vent in the inner guard to exchange ambient air.

[threedogs]

As an old v8 and turbo person this is 100% correct BUT there is some new wraps out now that are meant to prevent this, I'm about to fit a manifold and turbo blanket and wrap the dump in this new stuff so ill let you know how it goes.

will wait with interest on the outcome, I run a beanie atm
and my aux battery never get hot let alone warm

[threedogs]

Yep... agree with BB

The placcy shroud has a lip at the top and an air gap between battery and shroud on the sides.

IIRC there is/should be a small flexible pipe about 2 inch dia connecting the placcy 'cover' to a vent in the inner guard to exchange ambient air.

Mine is not fitted but if you want a pic yell out?

[threedogs]

Heres pic of the start battery cover there is also
a small piece of pipe to vent off into the guard

[sooty_10]

Here's my basic heat shield. I used the stuff from supercheap. Folded it and secured it to the battery tray. Used some rubber fuel hose to top it off. http://www.nissanpatrol.com.au/forums/images/imported/2016/09/178.jpghttp://www.nissanpatrol.com.au/forums/images/imported/2016/09/179.jpg


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