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power in the rear help?
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will.i.am
 


Member Since: 05 May 2016
Location: hertfordshire
Posts: 250

United Kingdom 2006 Discovery 3 TDV6 HSE Auto Keswick GreenDiscovery 3
power in the rear help?

hi, i am going to be installing a 3000w inverter in the back of my discovery and i was wondering has anyone got any suggestions on how they have run a feed from the battery to the back or is there a high power pick up i can get from the back existing wiring?

Be glad of any ideas!

many thnaks
  
Post #21519996th Jun 2020 5:44 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10335

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

There is a 30A towbar feed on the left side.
  
Post #21520036th Jun 2020 5:59 pm
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highlands
 


Member Since: 10 Jan 2010
Location: NW Highlands
Posts: 5085

Ukraine 2005 Discovery 3 TDV6 HSE Auto Java BlackDiscovery 3

3000W is 250A before conversion losses. That'd be seriously chunky cable.
You might be better off doing the conversion at the front, establishing a good earth connection so you just need +ve supply cable from the battery itself to the inverter and running 240V flex if temporary or armoured cable if permanent.
 Black 05 TDV6 HSE Auto
Grey 05 TDV6 HSE Auto (Gone)
54 TDV6 SE Man (killed by me Sad
 
Post #21520056th Jun 2020 6:04 pm
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highlands
 


Member Since: 10 Jan 2010
Location: NW Highlands
Posts: 5085

Ukraine 2005 Discovery 3 TDV6 HSE Auto Java BlackDiscovery 3

Bear in mind 3000W will overwhelm your alternator and/or drain a normal D3 battery in about 15mins.
 Black 05 TDV6 HSE Auto
Grey 05 TDV6 HSE Auto (Gone)
54 TDV6 SE Man (killed by me Sad
 
Post #21520066th Jun 2020 6:06 pm
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will.i.am
 


Member Since: 05 May 2016
Location: hertfordshire
Posts: 250

United Kingdom 2006 Discovery 3 TDV6 HSE Auto Keswick GreenDiscovery 3

ok maybe i should have explained a bit more. i will mostly use it for charging tools, running a cement mixer using 240 equipment when camping or the occasion use - the reason i have gone for 3000v is that if i ever need to use a welder or say a grinder/snip off saw etc it is then possible to use the inverter.

i used to have a 1500w one in my defender but this couldnt be used a couple of times so 3000w just gives me that extra degree of flexibilty.

thanks for he suggestion of the +ve from the front and find a good earth. do you know what routes people use most ? - under the body and come in at the back or would you route internally?
  
Post #21520116th Jun 2020 6:46 pm
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will.i.am
 


Member Since: 05 May 2016
Location: hertfordshire
Posts: 250

United Kingdom 2006 Discovery 3 TDV6 HSE Auto Keswick GreenDiscovery 3

highlands wrote:
3000W is 250A before conversion losses. That'd be seriously chunky cable.
You might be better off doing the conversion at the front, establishing a good earth connection so you just need +ve supply cable from the battery itself to the inverter and running 240V flex if temporary or armoured cable if permanent.


can i ask what conversion you are reffering to?
  
Post #21520126th Jun 2020 6:48 pm
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highlands
 


Member Since: 10 Jan 2010
Location: NW Highlands
Posts: 5085

Ukraine 2005 Discovery 3 TDV6 HSE Auto Java BlackDiscovery 3

If you have a 3000W load, the supply will be over 3000W as converting 12V DC to 240V AC involves losses.
 Black 05 TDV6 HSE Auto
Grey 05 TDV6 HSE Auto (Gone)
54 TDV6 SE Man (killed by me Sad
 
Post #21520186th Jun 2020 7:24 pm
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aja4x4
 


Member Since: 14 Apr 2019
Location: Westbury
Posts: 2459

United Kingdom 2005 Discovery 3 TDV6 SE Auto Zambezi SilverDiscovery 3

Dont stick 3000w up your rear or your get a warm bum Embarassed
  
Post #21520196th Jun 2020 7:26 pm
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JackNorris
 


Member Since: 06 Jul 2012
Location: Beds/Bucks Border
Posts: 1877

United Kingdom 2005 Discovery 3 4.4 V8 HSE Auto Tonga GreenDiscovery 3

How much is a 3000W inverter and cables? Surely you'd be better with a gene?
 MY2023 Discovery 5 R-Dynamic 3.0
MY2020 Discovery 5 Landmark 3.0 - SOLD
MY2005 Discovery 3 V8 4.4 HSE - SOLD
MY2019 Discovery 5 SE 3.0 - LR Replaced !
MY2005 Discovery 3 S 2.7 - SOLD
MY2016 Discovery 4 Graphite - SOLD
MY2015 Discovery 4 SE Tech - SOLD 
 
Post #21520226th Jun 2020 7:37 pm
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waterbuoy
 


Member Since: 26 Oct 2013
Location: Argyll
Posts: 2855

United Kingdom 2009 Discovery 3 TDV6 SE Auto Stornoway GreyDiscovery 3

Even with 850AH deep cycle batteries in our boats and 150A alternators we still limit the inverters we use to 1600W and, as Highlands says, have to use seriously chunky cable at that.

I can't help but think that trying to run a welder of the car electrics is only going to end in (expensive) tears.
 Currently 2009 Disco 3 SE and 2013 MY D4 HSE
Previously:
TD5 Defender 110 CSW (230k miles)
300TDi Disco 1 (289k)
4 RR Classics (300-350k each, 2 manual, 2 auto)
110 V8 CSW (220k)
S3 109 hi cap pickup (ex RN)
S2A 88 Safari SW with lpg conversion (bloody lethal) 
 
Post #21520236th Jun 2020 7:54 pm
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pwheeldon
 


Member Since: 14 Jan 2020
Location: West Yorks
Posts: 1436

England 2005 Discovery 3 TDV6 S Auto Bonatti GreyDiscovery 3

Hi,

I am happy to be corrected here, but the 3kw is at 220-230v, so you're looking at about 13A. I would be dubious about running a welder from it as in my experience they are rated a lot high than they can actually be run at. A lot will say 3kw max for a limited time and the usual running load would be 1.5kw.

Do you have a link for the inverter you're looking at? it should have tech specs including the max 12v load in amps, this will then tell you want size cable you need and how long your battery will last running it.

If youre set on doing this I would definitely be looking at using an auxiliary battery to power the inverter, or a decent generator. I had a 1500w inverter that couldn't cope with continuous loads of around 400-600w.

Hope that gives you a bit of help.
Cheers
Paul
 Discovery 4 GS 2009 Auto Stornoway Grey
Discovery 3 s 2005 Auto Bonatti Grey Gone
Discovery 3 SE 2005 Manual Zambezi Silver Gone
Range Rover Sport HSE 2006 Black
Aston Martin DB7 VV 
 
Post #21520396th Jun 2020 11:38 pm
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will.i.am
 


Member Since: 05 May 2016
Location: hertfordshire
Posts: 250

United Kingdom 2006 Discovery 3 TDV6 HSE Auto Keswick GreenDiscovery 3

thanks for the advice chaps - prehaps it will be better if i stick a 1500w in there then and then use a small quiet gene for the welding or higher wattage tools. TBH i have used a welder on a 3000w I'ta before you just have to stop/start weld rather than keep it going continiously but i dont really want to Censored up the battery or alternator.

Again thanks for your advice!
  
Post #21520417th Jun 2020 3:47 am
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aja4x4
 


Member Since: 14 Apr 2019
Location: Westbury
Posts: 2459

United Kingdom 2005 Discovery 3 TDV6 SE Auto Zambezi SilverDiscovery 3

Be warned most inverters are rated at there peak output not continuous output.

Most 3000w are acutually 1500w continuous inverters. there is also the type of power to consider from true signwave to modified signwave, you also cant connect just anything to an inverter they dont like things with windings such as battery chargers or things with capacitor start that can draw tripple the power when starting.

I modify vehicles for a living and have fitted a lot of inverters, they work very well if you have the right inverter for the job i get mine from Power solve

https://powersolve.co.uk/product-category/...inverters/

I have just built a Camper van and have fitted a 1500w inverter charger that acts as an inverter but also charges the battery when connected to the mains. It has a continuos output of 1200w.

https://powersolve.co.uk/product/eps-serie...y-charger/
  
Post #21520597th Jun 2020 7:44 am
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waterbuoy
 


Member Since: 26 Oct 2013
Location: Argyll
Posts: 2855

United Kingdom 2009 Discovery 3 TDV6 SE Auto Stornoway GreyDiscovery 3

pwheeldon wrote:
I am happy to be corrected here, but the 3kw is at 220-230v, so you're looking at about 13A. I would be dubious about running a welder from it as in my experience they are rated a lot high than they can actually be run at. A lot will say 3kw max for a limited time and the usual running load would be 1.5kw.


You are correct with regard to current 'downstream' of the inverter. However, the OP stated that the intention was to position the inverter in the rear of the vehicle. This means that the 'upstream' supply cables from the engine bay (assuming that is the primary source) would have to be able to deal with much higher currents as stated by Highlands and others, requiring much larger cable sections.
 Currently 2009 Disco 3 SE and 2013 MY D4 HSE
Previously:
TD5 Defender 110 CSW (230k miles)
300TDi Disco 1 (289k)
4 RR Classics (300-350k each, 2 manual, 2 auto)
110 V8 CSW (220k)
S3 109 hi cap pickup (ex RN)
S2A 88 Safari SW with lpg conversion (bloody lethal) 
 
Post #21520927th Jun 2020 10:04 am
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aja4x4
 


Member Since: 14 Apr 2019
Location: Westbury
Posts: 2459

United Kingdom 2005 Discovery 3 TDV6 SE Auto Zambezi SilverDiscovery 3

I have run the power cables underneath on my D4 to power the winch on my trailer.

You could also put the inverter where the second battery would fit under the bonnet and keep the primary wiring short but i personally wouldnt want to run an inverter off the main battery
  
Post #21521067th Jun 2020 11:06 am
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