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fridge test, battery
power consumption comparison between a household 240 volt 140 litre bar
fridge, and a 12 volt 140 litre Waeco fridge, for camping.
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Please note this test and article was first done (in 2003) as a reply to a question on the Motorhomes Australia forum,
so if it reads a little strange, well that's part of the reason :-)
I have completed my comparison testing of two 140 Litre fridges, one a 240 volt domestic type running through an inverter, and the other a 12 volt unit.
Well the question has been asked many times, can I buy a cheaper household (domestic) fridge for my motorhome/caravan etc and run it through an inverter?
And the answer is yes you can, but you have to ask the question, will it really save you money?
Now to understand the reason that someone would want to do this is simple, a 12/240 volt fridge made for motorhomes, caravans etc, costs a great deal more than a same sized 240 volt domestic one.
The two fridges that I tested were both 140 litres, though I suspect that the domestic 240 volt one was really 131 litres, it is an ‘LG’ brand model GR-131SSF, cost $299.00, The 12 volt one is a Waeco APR –140RF, cost $1,595.00.
This comparison was purely to find out how much power each of these fridges would consume from a 12 volt battery over a 24 hour period.
Running at the same load and in the same room at the same temperature both inside the fridges and out, these tests were performed under controlled and ideal conditions, the battery voltage was a constant 13.65 volt whilst under load.
I won’t go into all the detail of the monitoring/charging/inverter/battery system at this stage, but it was state of the art and linked to a computer.
My target temperature for inside the fridges was 5 degrees Celsius (second bottom shelf), this was adjusted and set during the 24 hours run up time prior to the test period for each fridge.
The room temperature ranged from 26-29 deg throughout the test (air-conditioned).
Current consumed during the 24 hour test period.
‘LG’ 240 volt fridge………….99.6Ah TOTAL, with a 7Amp average whilst in the 'on' cycle and 42.2Amp peak on start up.
‘WAECO’ 12 volt fridge……..42.2Ah TOTAL, with a 4.5Amp average whilst in the 'on' cycle.
Now here is my angle on this.
Without going into all the pros and cons of a domestic fridge verses the purpose built fridges for motorhomes etc, like that the insulation in the domestic fridges is not as good, but hey that’s easily fixed with a tube of liquid-nails and some sheets of polystyrene foam right ;-)
Lets look at the practical side of it.
If you are going to be parked up with 240 volt power connected every night (caravan park etc), then the 240 volt fridge is an option worth considering.
If however you like to bush camp a lot, and for extended times, consider this, the extra 57.4 Ah required each to run the 240v fridge over and above the 12v one means at least one extra 120Ah deep-cycle battery will be required...... $$$... and extra weight!
Oh and them Amps have to be replace everyday too, so if solar is your main battery charging source, then you will need at least an extra 200 Watts of solar panel area, and ....$$$, either way you will have to get the extra power from somewhere.
Hows the cheap fridge looking now?
Any questions folks? :-)
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