Author Topic: 36 litre Fridge Freezer  (Read 69 times)

Online alans1100

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36 litre Fridge Freezer
« on: April 12, 2019, 04:43:04 PM »
I noticed one of these in our local newsagent (it's also a toy and jaycar store) https://www.techbrands.com/store/product/gh1640.aspx



Runs on 12 volt or 240 volt power

I'm not up on all the conversion stuff but it be would nice to have this compared to our 50L ice box.

Should not be an issue during the day but overnight maybe different

So we start with an 80W solar panel via a charge controller into a 12 volt 20 amp hour deep cycle battery.

Fridge average consumption is 0.2 kwh

Continuous Power equals 45W

Either 12 or 24 volt battery

Current draw equals 1.875A, 3.75A  - two independant zones - one of which can be turned off.

Does this mean a 20 amp hour battery will run this for either 20 / 3.75 =  5.333 hours or 20 / 1.875 = 10.667 hours ?

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Online Brock

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Re: 36 litre Fridge Freezer
« Reply #1 on: April 12, 2019, 04:54:24 PM »
The tow bar looks dodgey, and the wheels dont look they could take 110Ks for too long
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Online Shillas

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Re: 36 litre Fridge Freezer
« Reply #2 on: April 12, 2019, 05:11:47 PM »
 :rofl
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Online CallMeSteve

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Re: 36 litre Fridge Freezer
« Reply #3 on: April 12, 2019, 05:30:21 PM »
Alan, I might be way off, but the way I'd read this is:

When running from 12V it draws 3.75A,  when running from 24V it draws 1.875A.  Each of these scenarios equals the specified 45W operating power.

Those figures are most likely to be the power draw while the unit is actively cooling.  Since it runs off a thermostat it will settle down to an intermittent on/off duty cycle dependent on how much you open the lid and how much heat leaks through the insulation.

I think a useful figure is their estimate of 200Wh per 24 hours, which corresponds to an average of 8.3W, which off a 12V battery is 0.7A averaged over the 24 hour period. In other words they are estimating that it will run with a steady state duty cycle of approx 20% on / 80% off.

That suggests to me that you could expect a 12V 20 Amp-Hour battery to run it for something like 28 hours.
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Re: 36 litre Fridge Freezer
« Reply #4 on: April 12, 2019, 05:34:10 PM »
The tow bar looks dodgey, and the wheels dont look they could take 110Ks for too long

 :rofl
 

Offline winston66

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Re: 36 litre Fridge Freezer
« Reply #5 on: April 12, 2019, 07:21:58 PM »
If it a Peltier type solid state cooler devise as  compered against a proper compressor type ( ENGEL, or WAECO).  do not expect it to be very efficient when and if you are expecting it to quickly cool down anything  that is at  room temperature IE. say around 20deg. C . Or to actually freeze anything. They,  The Peltier coolers have a very limited temperature operating capability, and in my experience are only really use full when the contents can be precooled before loading it up. Would probably work ok if the ambient temperatures did not exceed 20 to say 25 deg. C . Absolutely useless if ambient is around the 35 deg C.mark
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Online alans1100

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Re: 36 litre Fridge Freezer
« Reply #6 on: April 12, 2019, 08:19:41 PM »
If it a Peltier type solid state cooler devise as  compered against a proper compressor type ( ENGEL, or WAECO).  do not expect it to be very efficient when and if you are expecting it to quickly cool down anything  that is at  room temperature IE. say around 20deg. C . Or to actually freeze anything. They,  The Peltier coolers have a very limited temperature operating capability, and in my experience are only really use full when the contents can be precooled before loading it up. Would probably work ok if the ambient temperatures did not exceed 20 to say 25 deg. C . Absolutely useless if ambient is around the 35 deg C.mark
Cheers,
Winston66

I have one of those coolers, takes ages to cool down and they work better with an ice brick or two.

This one seems to have 12 volt DC compressor and uses R134a gas in the specs with a temp setting range of -20C to +20C at an ambient temp of 25C.

At $400 it's just on a wish list rather a need it list.
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