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DISCO3.CO.UK > Maintenance & Mods (D4)

Dual Battery and "Intelligent Alternator"
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GraemeS
 


Member Since: 17 Mar 2008
Location: NSW
Posts: 706

Australia 2010 Discovery 4 3.0 TDV6 SE Auto Nara BronzeDiscovery 4

drivesafe wrote:
As far as Jump Starting goes, if you have the auxiliary battery installed under the bonnet, all you need to jump start is a single jumper lead, connected between the positive terminals of both batteries.

with the proviso that the 2nd battery has its own high current capacity earth cable, not just a low current charging negative cable.  
Post #6993583rd Oct 2010 8:25 am
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PSC
 


Member Since: 01 May 2006
Location: Johannesburg
Posts: 255

South Africa 2010 Discovery 4 5.0 V8 HSE Auto Fuji WhiteDiscovery 4

drivesafe wrote:
I can see many problems for people trying to charge their auxiliary/house batteries when these vehicles operate with voltages as low as 12.2v.


Thanks drivesafe,

Would a DC to DC converter not also be a requirement ?  
Post #6993593rd Oct 2010 8:29 am
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drivesafe
 


Member Since: 23 Feb 2006
Location: Gold Coast, Australia
Posts: 867

Australia 

GraemeS wrote:
drivesafe wrote:
As far as Jump Starting goes, if you have the auxiliary battery installed under the bonnet, all you need to jump start is a single jumper lead, connected between the positive terminals of both batteries.

with the proviso that the 2nd battery has its own high current capacity earth cable, not just a low current charging negative cable.


Hi GraemeS, my D3 kits, these are all intended to have the auxiliary battery in the auxiliary battery compartment, are supplied with a suitably heavy duty earth/neg cable for earthing the auxiliary battery to the d3’s earth stud.

The kits fit the same way in a D4 when the auxiliary battery is fitted in the same compartment. 2008 TDV8 RR Lux + 2009 D4 2.7  
Post #6993983rd Oct 2010 11:40 am
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drivesafe
 


Member Since: 23 Feb 2006
Location: Gold Coast, Australia
Posts: 867

Australia 

PSC wrote:
drivesafe wrote:
I can see many problems for people trying to charge their auxiliary/house batteries when these vehicles operate with voltages as low as 12.2v.


Thanks drivesafe,

Would a DC to DC converter not also be a requirement ?


Hi PSC, like other brands of isolators, DC-DC converters have a cut-out voltage level of around 12.7v so they too would be continually cutting in and out and I’m not sure this would be a good thing for these types of devices, but even if they can handle the continuos on and off cycling, they are only good for charging one battery at a time and even then they would not be on long enough to be of any real use if the auxiliary battery was in a low state.

Whereas, the SC80-LR, even when the D4's voltage was low, would be continuously charging any number of auxiliary/house batteries. 2008 TDV8 RR Lux + 2009 D4 2.7  
Post #6994013rd Oct 2010 11:47 am
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