-
14th September 2016, 11:05 PM
#1
Legendary
Battery Heat Shielding
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
-
-
14th September 2016 11:05 PM
# ADS
Circuit advertisement
-
15th September 2016, 07:42 AM
#2
Travelling Podologist
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.
2006 4.2TDi ex-Telstra Remote area Camper. 425w roof mounted solar, 360Ah Aux batts, BCDC1240, Onboard hot & cold pressurised & filtered water, (25 litre hot water calorifier), ARB fridge, ARB freezer, Built in kitchen, heaps of easy access storage, 240v, 3” Genie exhaust + dynotune, 2” lift, 3900kg GVM upgrade, second glovebox, ROH Blaktrak steel wheels, Bridgestone D697's (now Toyo RT's), Redarc gauges/pillarpod, Hema HX-1, Icom 450 CB, dual rear view cameras, Onboard 30amp Victron mains charger, second glovebox, dual seat conversion, TPMS, Boss PX7 onboard air with 9 litre tank, 350w inverter, Steel bullbar, Harrop Eaton diff lock (front), Warn winch, Snorkel, Dual spares , 160 litre water tank, 180 litre fuel in two tanks (approx 1200km range) 2010 Tvan Tanami. (incl another 70 litre water tank) with matching wheels/tyres (& 3rd spare)
A Nomadic Life (Blog)
-
The Following User Says Thank You to Cuppa For This Useful Post:
dom14 (15th September 2016)
-
15th September 2016, 09:52 AM
#3
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?
-
The Following User Says Thank You to mudski For This Useful Post:
dom14 (15th September 2016)
-
15th September 2016, 12:25 PM
#4
Patrol God
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.
Last edited by threedogs; 15th September 2016 at 01:27 PM.
04 ST 3lt auto, not enough Mods to keep me happy, but getting there
-
The Following User Says Thank You to threedogs For This Useful Post:
dom14 (15th September 2016)
-
15th September 2016, 01:25 PM
#5
Patrol God
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.
-
The Following User Says Thank You to BigRAWesty For This Useful Post:
dom14 (15th September 2016)
-
15th September 2016, 01:29 PM
#6
Patrol God
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
04 ST 3lt auto, not enough Mods to keep me happy, but getting there
-
The Following User Says Thank You to threedogs For This Useful Post:
dom14 (15th September 2016)
-
15th September 2016, 06:26 PM
#7
Expert
Originally Posted by
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
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.
-
The Following User Says Thank You to johno90 For This Useful Post:
dom14 (15th September 2016)
-
15th September 2016, 07:33 PM
#8
Legendary
Originally Posted by
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?
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).
-
-
15th September 2016, 09:03 PM
#9
Expert
Originally Posted by
dom14
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 Following User Says Thank You to Brissieboy For This Useful Post:
dom14 (15th September 2016)
-
16th September 2016, 02:03 PM
#10
I am he, fear me
Originally Posted by
Brissieboy
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.
Dolphins are so smart that within a few weeks of captivity, they can train people to stand on the very edge of the pool and throw them fish.
-
The Following User Says Thank You to the evil twin For This Useful Post:
dom14 (21st September 2016)