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Privatteer Profile
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X-TRAIL NEWBIE
 


Date Registered: 03-2011
Location: WA
TOTAL POSTS: 22
Reply | QUOTE
Re:


Just add a main fuse back at the battery connection. Otherwise you have no protection for a short from the battery up to your terminal strip.
Normally the 15amp fuse for the fridge would be the 1st thing after your terminal strip as well.

Assuming 70Ah battery.
190w = roughly 15.8Amps (Battery voltage changes as drains)
80% discharge is generally max.

70x 0.8 = 56Ah
56/15.8 = 3.5hours

15A is a fairly heavy draw so some other factors like discharge rates will probably come into it. I would say 3hours.

Does not seem like a long time but I don't think I made a mistake.

Last edited by Privatteer, 15/Apr/2011, 2:40 pm


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2003 Xtrail T30 Ti
15/Apr/2011, 2:38 pm Link to this post Send Email PM   Send Private Message
 
iaindb Profile
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X-TRAIL ENTHUSIAST
 


Date Registered: 06-2009
Location: Palmerston, NT
TOTAL POSTS: 110
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Re:


OK I've fitted and installed the heavy duty fridge cable and brake controller.

I revised the diagram above slightly as Privatteer mentioned - I moved the fridge fuse (20A) to the engine side of the firewall, and I took two different lugs off the battery rather than a terminal strip. I also used 8mm squared double insulated cable. I used some heavy duty lugs and a massive double hinged crimper we have at work!

The voltage drop between battery terminals and cable end (about 5.5m plus relay and fuse) is 0.02V under no load. I'll test the load soon.

And regarding your calculations, 190W is the AC current draw, the DC element is a different one. Apparently others have measured this fridge at 10A, so:

70 x 0.8 = 56Ah
56/10 = 5.6 hours

which is close to the figures I found online of 4 hours.

You're right it's not long, but I only want this system while on the road (eg for 8 hours a day) or for the daily stops (lunch, picnic, whatever). For the overnight / multi-day stays I'll put it on gas, or hang an AC lead through the window!

Thanks for all the advice from everyone! I'll do some pics and specs soon.

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Iain == X-1283 ==
T-30 ST-S, 2007, Twilight, Mags, Sun Roof

21/Apr/2011, 7:29 pm Link to this post Send Email PM   Send Private Message
 
Revhead Kev Profile
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6355
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Re: 12V Outlet


Would the fridge be pulling maximum current ALL the time ?
I expect there to be some level of diversity where the fridge would pull maximum current for a period then only a minimal amount once at temperature and only short cycling ON/OFF to maintain temp.

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Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
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21/Apr/2011, 7:46 pm Link to this post Send Email PM   Send Private Message Blog
 
cooch t31 Profile
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X-TRAIL HOLIC
 


Date Registered: 06-2008
Location: Blue Mountains, NSW
TOTAL POSTS: 5966
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Re:


I have had my fridge (Waeco 50l) run in my Xy for nearly 3 days straight without starting the engine. Started without a problem.
The fridge is intermitent in operation and when you add up the times the cycle kicks in, it probably is only about 5 hours worth.

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Tony X-891c

HERE is my D22 Navara
HERE is my old 2008 T31, ST Series1

22/Apr/2011, 5:23 am Link to this post Send Private Message
 
Robbo0001 Profile
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BANNED USER

Date Registered: 07-2008
Location: Brisvegas, Australia
TOTAL POSTS: 1063
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Re: 12V Outlet


If you run the fridge on AC at home, get all the stock down to temp, it will cycle the minimum amount to maintain temperature. Driving and keeping the fridge running on DC, will also mean that the fridge wont be "on" all the time whilst the vehicle is off.
The intial start-up current (momentary)on some compressors can be up around 10-12 Amp, but once the scroll compressor is moving can drop as low as 1 or 2 amps.(or less)
You should get two days out of a decent battery, provided the fridge is shaded, lid closed properly etc etc
If you can get your hands on a Tong/ Clamp tester, you can easily know what current it draws (or stick an inline ammetre in the circuit, as well as a voltmetre if required...I would definately have a visible, analogue voltmetre for any possible long halts)

Sounds like you have done a good install...enjoy the coldies emoticon



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Dave
99 GU Patrol 2.8TD
Ex-2002 T30 TI Xtrail
22/Apr/2011, 6:18 am Link to this post Send Email PM   Send Private Message
 
cooch t31 Profile
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X-TRAIL HOLIC
 


Date Registered: 06-2008
Location: Blue Mountains, NSW
TOTAL POSTS: 5966
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Re:


I put a multimeter on the battery when the fridge started a cycle and the volts droped from 12.46 volts to 12.1 volts and stayed there until the cycle ended..
The fridge was already cold before I put it in the car and was on a low setting..

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Tony X-891c

HERE is my D22 Navara
HERE is my old 2008 T31, ST Series1

24/Apr/2011, 8:30 pm Link to this post Send Private Message
 


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