Author Topic: MK111 Tvan Fridge Power  (Read 1156 times)

Offline Patrol Dude

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MK111 Tvan Fridge Power
« on: April 09, 2018, 04:47:51 PM »
I have a National Luna Weekender 50ltr fridge in the Tvan. Several times over the last 7 years the fridge has come on due to 240v being plugged into the Tvan to charge the batteries, that kid of mine “wasn’t me” turned it on, or god forbid the bride turned it on and forgot!!!
So to stop this from happening again I fixed it


Should never get another surprise again


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Jeff & Trish
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Offline MarkA

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Re: MK111 Tvan Fridge Power
« Reply #1 on: April 09, 2018, 05:04:25 PM »
And that’s a ??  With auto shutdown at ??? And it cost ???
Sorry to me I see a black box with the smoke firmly held in but I just know if I get hold of it I can get that tricky smoke free in no time.
Please expand your description.
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Offline Gumb

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Re: MK111 Tvan Fridge Power
« Reply #2 on: April 09, 2018, 08:48:41 PM »
Sorry but I'm confused here. The Tvan gets plugged in to 240v, the fridge runs on 12v off the batteries, the batteries are charged by the 240v so they don't run down, even if the fridge runs all day. Where's the problem ?
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Offline Patrol Dude

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MK111 Tvan Fridge Power
« Reply #3 on: April 09, 2018, 09:11:36 PM »
OK some clarification.
This is a 12v 60Amp resettable circuit breaker. It allows me to have the fridge connected to power constantly, but with a push of the red button cuts the positive feed to the fridge ensuring that the fridge will not operate. Cost depends on supplier anywhere from $30 to $60.
Problem is that, when the 240v was plugged into the Tvan and the batteries where topped up, the fridge would just turn on - sometimes!!!
The fridge circuitry would notice the extra power when the 240v was plugged in and turn the fridge on. Obviously while the 240 is connected who cares right!!! But when you top the batteries up, disconnect the 240 and let it sit for a few weeks till the next camping trip, well the batteries cope a fair hiding and drop to the minimum setting that the fridge will accept, which was 10.5v.
So through having an additional voltage breaking relay just prior to the fridge that is manually set, stops any possible ability for the fridge to turn on, either by voltage sensors or “wasn’t me” type scenarios.
Like I said, problem fixed.



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Jeff & Trish
RockVegas
2000 GU 4.2TD (with lots of stuff)
237-RWHP 662-RWNM 
2011 TVan Murranji (with lots of stuff) :)

Offline Phil G

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Re: MK111 Tvan Fridge Power
« Reply #4 on: April 09, 2018, 09:13:36 PM »
I can see the problem.......the switch is upside down:-)
or is it the 60A curcuit breaker protecting the 20A wiring???
I share Gumb's confusion!
Phil
2003 Tvan behind a 2012 200series Landcruiser

Offline robstevens

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Re: MK111 Tvan Fridge Power
« Reply #5 on: April 09, 2018, 09:22:25 PM »
Surely the fridge doesn't draw more than about 5 amps?
Therefore pretty much any 12v on-off switch would do?
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Offline MarkA

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Re: MK111 Tvan Fridge Power
« Reply #6 on: April 09, 2018, 09:23:55 PM »
My Engel fridge has an off switch.
Never had it start without turning it on.  Sounds like a design fault with you’re fridge to me
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Offline Gumb

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Re: MK111 Tvan Fridge Power
« Reply #7 on: April 09, 2018, 10:24:45 PM »
My Engel fridge has an off switch.
Never had it start without turning it on.  Sounds like a design fault with you’re fridge to me

OK, I see his issue and I'm with MarkA, the fridge must have a problem. I run a Waeco and an EvaKool and neither of them comes on by itself just because I plug in to 240v.
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Offline Patrol Dude

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Re: MK111 Tvan Fridge Power
« Reply #8 on: April 10, 2018, 07:28:32 AM »
Without stating the obvious, Yes the fridge has an issue, had it to the fridge repairer he had a real good look, and could not find the problem. So easiest fix was what I have done. Yes, the fridge only pulls around 4 amps, no you will not find a simple 12v switch to handle this continuous current with out going through a relay - hence what I have used which can handle a lot more than just 4amps.


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Jeff & Trish
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237-RWHP 662-RWNM 
2011 TVan Murranji (with lots of stuff) :)

Offline peter_mcc

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Re: MK111 Tvan Fridge Power
« Reply #9 on: April 10, 2018, 10:03:44 AM »
Yes, the fridge only pulls around 4 amps, no you will not find a simple 12v switch to handle this continuous current with out going through a relay - hence what I have used which can handle a lot more than just 4amps.

Interesting fridge fault - sounds more like a "feature" that doesn't make sense (or software bug) rather than a fault that could be fixed.

The switch you have on the right of the photo could probably handle the current - this one is rated at 12V 30A and looks similar.
http://www.altronics.com.au/p/s3248-spst-low-voltage-red-led-rocker-switch/

Your one can definitely handle the current and is harder to accidentally turn on/off. Plus if you didn't have the mounting bracket for the other one already there the circuit breaker is a heap easier to mount!

Offline Patrol Dude

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Re: MK111 Tvan Fridge Power
« Reply #10 on: April 10, 2018, 11:34:04 AM »
Hi Pete, the additional switch is for an additional light that I haven’t quite got around to installing yet. I can not open the attachment but most switches have a momentary power load, not a constant power load rating. Yes the 60Amp circuit breaker might just be big enough and as you illustrated much easier and safer to use. Cheers


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Jeff & Trish
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237-RWHP 662-RWNM 
2011 TVan Murranji (with lots of stuff) :)

Offline Cruiser 105Tvan

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Re: MK111 Tvan Fridge Power
« Reply #11 on: April 10, 2018, 12:36:47 PM »
Jeff, have you connected the fridge to 240v whilst it sits in the front box?
Because that'll do what your describing.
Robert.
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Offline Patrol Dude

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Re: MK111 Tvan Fridge Power
« Reply #12 on: April 10, 2018, 02:15:14 PM »
Hey mate, yeah the fridge is permanently mounted in the box and connected to power - replaced the Merritt plug with a Anderson plug and connected the circuit breaker.
Has always, just turned on when the 240v is plugged - caught me out a few times, not any more though


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237-RWHP 662-RWNM 
2011 TVan Murranji (with lots of stuff) :)

Offline Cruiser 105Tvan

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Re: MK111 Tvan Fridge Power
« Reply #13 on: April 10, 2018, 04:56:52 PM »
Ok, that's how they're supposed to work.
If 240v comes on, they start IF they are turned on.
If they are running and 240v. is turned on and plugged in, it'll run on 240v, not 12v.
So if you don't want the fridge on, you have to turn it off at the fridge.
Or at least that's how mine works.  Mine's an Engel not a National Luna.
Hope you've fixed yours.
« Last Edit: April 10, 2018, 05:03:46 PM by Cruiser 105Tvan »
Robert.
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Offline Harry Lissimore

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Re: MK111 Tvan Fridge Power
« Reply #14 on: April 10, 2018, 05:18:11 PM »
ARB is similar.  If 240 and 12 are both plugged in and the fridge is turned on, then 240 is always favoured.  If 240 turns off then 12 takes over until 240 is turned on again.  When the fridge is turned off at the fridge, it's OFF and won't start up if 240 or 12 is connected.
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