Amps Volts and Watts

Submitted: Sunday, Feb 04, 2018 at 15:51
ThreadID: 136214 Views:1248 Replies:8 FollowUps:3
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I have just purchased a 2017 Pajero and the power point at the back where a fridge can be plugged in has a stamp on the cover saying its 120 Watts, will that be sufficient power to run an 80 lt fridge freezer, or is that only 10Amp and I should upgrade it to 15Amp..
all help appreciated.
Rob
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Reply By: Allan B (Sunshine Coast) - Sunday, Feb 04, 2018 at 16:05

Sunday, Feb 04, 2018 at 16:05
.
Yes Robert, that is 10 Amps max current draw at a nominal 12 volts.
But it is quite possible that if you were to draw 10 Amps from it the voltage at the power point would drop by a volt or so.

The average fridge only draws around 2 Amps so it may be OK. We will probably hear from some Pajero owners who can comment on it performing with their fridge.
Cheers
Allan

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AnswerID: 616659

Reply By: Gronk - Sunday, Feb 04, 2018 at 16:27

Sunday, Feb 04, 2018 at 16:27
In theory it should work, but in practise it may not. The size of the factory wiring may be rated to carry 10A, but voltage drop, as mentioned, may see your fridge cut out due to undervoltage.
If it was my 4wd, I'd run a dedicated twin cable and merit socket to the rear......8mm2 would be sufficient !
Nothing worse than hot beer, when $100 in cable and socket etc will assure you of no problems.
AnswerID: 616660

Reply By: Gazza11 - Sunday, Feb 04, 2018 at 16:36

Sunday, Feb 04, 2018 at 16:36
I think it highly unlikely that any compressor fridge would draw 10A continuously, more likely 2-3 amps but maybe a spike of 10A for a millisecond at compressor start up which shouldn't blow the fuse or cook the wiring!
Gazza
AnswerID: 616661

Reply By: Member - Boobook - Sunday, Feb 04, 2018 at 16:41

Sunday, Feb 04, 2018 at 16:41
Completely bypass the wiring to that. A typical fridge will draw 5 - 6 amps. ( and an average of about 1 - 2 A)

Toyota have somehow managed to use wire thinner than the hair of an ant, and rate it at 10A ( 120W). There are 2 problems with the factory wiring.

1)The voltage drop at 5A will be too high and your fridge will cut out while the battery is still high.
2)It's probably wired to the accessory circuit and wont work when the ignition is off.

Tony
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Happiness >= your perception of the events in your life minus your expectation of how life should be.

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Follow Up By: RMD - Sunday, Feb 04, 2018 at 19:51

Sunday, Feb 04, 2018 at 19:51
Nearly all modern vehicle wiring is just enough to make it work but not to avoid voltage drop as Bookook has said.
Anything additional for accessories should be reliably supplied so as to ensure the performance of the appliance.

Although different situation, my old HJ61 Toyota had 10.8 v at the headlights when alt was 14v. After making a proper loom, as suggested for the fridge, my headlight ran at 13.8v. Use an Anderson plug and have one on the fridge too so a positive connection is maintained.
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Reply By: Genny - Sunday, Feb 04, 2018 at 17:55

Sunday, Feb 04, 2018 at 17:55
Good to see Toyota copping some stick ..........







about the wiring on a Pajero! :) :) :)
AnswerID: 616666

Follow Up By: RMD - Sunday, Feb 04, 2018 at 19:52

Sunday, Feb 04, 2018 at 19:52
They all make to a PRICE.
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Follow Up By: Member - Boobook - Sunday, Feb 04, 2018 at 21:51

Sunday, Feb 04, 2018 at 21:51
Ahh good point Genny. I was thinking it was a Prado for some reason.
Tony
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Happiness >= your perception of the events in your life minus your expectation of how life should be.

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Reply By: Member - Mark (Tamworth NSW) - Sunday, Feb 04, 2018 at 18:15

Sunday, Feb 04, 2018 at 18:15
Robert
Unless something has changed from the NP,NS and now 2014 NW Pajero that I have owned, it won't even run a Waeco 50A fridge when the engine is turned off (alternator isn't functioning)
The wiring resistance is just too high
From memory the standard rear fitting only works on ACC or when the engine is running, no power when the key is removed from the ignition.
So it will probably work when driving, forget it otherwise

If you want to run the fridge when the engine is turned off, you will need to run heavier gauge to the rear point.

Mark


AnswerID: 616667

Reply By: HKB Electronics - Sunday, Feb 04, 2018 at 18:31

Sunday, Feb 04, 2018 at 18:31
Personally I wouldn't run and reasonable size fridge from a factory power outlet as the wiring is very small and the quality of the outlet would be questionable.

My second concern would be if your using the factory outlets then you probably intend to run the fridge from the cranking battery which again is a worry.

Third point as pointed out above in some vehicles the power outlet aren't active with the ignition off. In some this can be overcome by linking out the relay that controls the circuit but your using the cranking battery and loosing any protection it had.
HKB Electronics

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AnswerID: 616668

Reply By: swampy - Sunday, Feb 04, 2018 at 19:50

Sunday, Feb 04, 2018 at 19:50
hi
Fridge surge amp demand may cause volts to go low . Fridge may cut out . May happen a little or a lot but never at a convenient time .
A surging compressor has a shorter life !!

Low batt volt at compressor end happen even quicker due to the volt drop in cable.

Its best not to use starter battery for fridge supply .

The aux /ciggy plug rating might be10 amp but continuous will be a max of 5 amp or less .

second battery to fuse to low volt disconnect [set at 12 volts] to fridge
At least 6mm auto == 4.5sqmm wire size
AnswerID: 616670

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