Converting our 3 way fridge to compressor. (1 Viewer)

OP
Richard n Ann
Jan 19, 2014
8,093
20,705
Derbyshire
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29,757
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Elddis Accordo 105
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since 2014
Interesting way to do it. I'm just in the process of installing a Beko 240 volt fridge run off inverter and 300 watts of solar.
That's not too bad if you can switch the inverter off with the thermostat via relay/contactor. That's what I did with a small freezer I set up in my shed 👍
 

DP+JAY

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Mar 17, 2010
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since 2007, 25 years tuggin before that.
Couple if questions,
Are you testing the fridge empty or loaded?
Is there a kit available for a domestic fridge with freezer above?
Thanks.
DP

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OP
Richard n Ann
Jan 19, 2014
8,093
20,705
Derbyshire
Funster No
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Elddis Accordo 105
Exp
since 2014
Couple if questions,
Are you testing the fridge empty or loaded?
Is there a kit available for a domestic fridge with freezer above?
Thanks.
DP
Empty.
Yes dometic make various different kits but they're more money, I'll look for a link...


Edit; Here is what could be the freezer version, don't know how successful it would be without a door on the front

 

DP+JAY

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I was wondering how being full will affect the the run & off times, large mass of cold stuff taking longer to warm up & cool down.
DP
 
OP
Richard n Ann
Jan 19, 2014
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Derbyshire
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I was wondering how being full will affect the the run & off times, large mass of cold stuff taking longer to warm up & cool down.
DP
It will a bit, more so if you put something warm in, but not too much because the thermostat is fastened to the back of evaporator which will get cold quickly regardless of food temperature.

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DP+JAY

LIFE MEMBER
Mar 17, 2010
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since 2007, 25 years tuggin before that.
I'll look forward to real life figures to compare with the 12 hours you did empty.
DP
 
OP
Richard n Ann
Jan 19, 2014
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Half filled it and ran it overnight, about the same 6 start ups per hour.

Screenshot_20220609-084619_Battery Monitor.jpg


Nice steady temperature :
Screenshot_20220609-091648_Sensor Blue.jpg


I'll measure the amp hours used again tonight 👍
 
Sep 26, 2011
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Can any one explain how our home fridge/freezer you can set say the freezer to -18 and the fridge to +3 I assumed it must have 2 thermostats but only 1 compressor, where the fridge/freezer in our van std Dometic absorption shares the same cooling plate in the rear with the freezer getting the lions share.
 
OP
Richard n Ann
Jan 19, 2014
8,093
20,705
Derbyshire
Funster No
29,757
MH
Elddis Accordo 105
Exp
since 2014
Can any one explain how our home fridge/freezer you can set say the freezer to -18 and the fridge to +3 I assumed it must have 2 thermostats but only 1 compressor, where the fridge/freezer in our van std Dometic absorption shares the same cooling plate in the rear with the freezer getting the lions share.
There are different arrangements, sometimes the fridge stat operates a solenoid valve and the other stat brings the compressor on.

Sometimes there's 2 compressors (less common)

Mostly though the system is calibrated so the refrigerant goes into the fridge after the freezer and it all works out OK. Thermostat is in the fridge on this type so if you keep it in your garage over winter everything defrosts 🙄😊

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OP
Richard n Ann
Jan 19, 2014
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Another little job. Dometic should have done this one, but I suppose if they can save a couple of quid it makes sense 🙄😏

20220609_160151.jpg


20220609_164145.jpg


I wired it up through the other pole of the off switch so the battery isn't draining all year.

20220609_165412.jpg
 
OP
Richard n Ann
Jan 19, 2014
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Exactly the same, 7ah used, 6 start-ups per hour..
 

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Dec 22, 2018
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I tried mine running the inverter in eco mode (polls for demand every few seconds and only turns on if required), but then the Fridge light doesn't work if the fridge isn't running. If it makes a significant difference and I need to conserve power, I'll do it, but I don't think that's likely.

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OP
Richard n Ann
Jan 19, 2014
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Right that standard thermostat is ridiculous, it was switching the compressor on every 5 minutes. Fitted a little digital module this morning for full temperature control 👌
It has differential settings, compressor protection, probe offset and even alarm 😎

20220623_074748.jpg


Positioned the thermistor to sense cabinet temperature 3°c with diff of 2.
No defrost setting but I can sort that manually.
 
OP
Richard n Ann
Jan 19, 2014
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Much better now, switching on about 3 times an hour rather than about 10 times according to the battery voltage graph.
Earlier I timed it to run 14 minutes, then off for 10 minutes so just starting up every 24 minutes. 👌

Screenshot_20220623-203737_Battery Monitor.jpg
 
OP
Richard n Ann
Jan 19, 2014
8,093
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Derbyshire
Funster No
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I've turned the controller down to 0°c (cut out 0° back in at 2°) because the thermistor is at the back near the evap, that gives a middle fridge temp of 3 to 4° 👌
Last night the fridge used about 9 amp hours. It's cloudy today but the battery is now just about recharged with 1ah to go.

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