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Old 10-31-2019, 05:44 AM   #1
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Default Most efficient Fridge

Hello Everyone,

What refridgeration do you have in your campervan? I plan to build a 400aH/600Watt electrical system. I plan t have isotherm water heater and microwave. I was originally thinking of ARB Portable Fridge Freezer 50 Quarts but wanted to check and see whate veryone has and go with the most efficient one.
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Old 10-31-2019, 05:48 AM   #2
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Default Re: Most efficient Fridge

My Norcold 4 cu.ft. propane refrigerator/freezer uses ~18-20aH per day.
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Old 10-31-2019, 07:50 AM   #3
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Default Re: Most efficient Fridge

Quote:
Originally Posted by OrioN View Post
My Norcold 4 cu.ft. propane refrigerator/freezer uses ~18-20aH per day.
Is that Ah from 12 - 13 V supply while running on propane? Absorption fridges are very inefficient when running on electricity.

My electric only Vitrifrigo 115 liter compressor fridge uses about 40-50 Ah per day running on 13V when the outside temp is about 75 degrees. The propane fridge it replaced used about 4X times that much when running on 13V, when it worked.

I would expect any compressor fridge with a similar system (Danfoss compressor) would use a proportional amount. A 50 quart (47 liter) compressor fridge should be below 20 Ah per day.

Regards,

Mark
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Old 10-31-2019, 12:48 PM   #4
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Default Re: Most efficient Fridge

I have an Isotherm Cruise 219, which is much larger than you are looking for, it uses a DanFoss compressor and pulls 5amps when running the compressor and less than 2 when compressor is off. Manufacturer literature says operates at a average of 2.5 amps. I run it on my AGMs (215ah) to start it up in my driveway before trips and after 4 hours my batteries are still at 94% SOC. Isotherm also has Smart temperature controllers that can be added that provide for a soft start on the compressor (reducing the peak load spikes) and provides an overall 50% reduction in power use. They offer lots of choices starting with a 40 liters, https://www.indelwebastomarine.com/i...se-65-classic/. Here is a Refrigerator comparison chart, https://www.suremarineservice.com/Ga...ze-Comparison/, that can be sorted by cuft so you can compare Refrigerators by size for your space.
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Old 10-31-2019, 05:04 PM   #5
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Default Re: Most efficient Fridge

I have some screenshots from my Victron MPPT in mid August (90F days, 60F nights)that indicate about 200 Whr/day of consumption for my Dometic CFX50 refrigerator. That is probably averaging at about a 13V output. I leave it on all the time running off 200w solar and a 100Ahr house battery.
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Old 10-31-2019, 05:13 PM   #6
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Default Re: Most efficient Fridge

Quote:
Originally Posted by Wheeljack View Post
I have some screenshots from my Victron MPPT in mid August (90F days, 60F nights)that indicate about 200 Whr/day of consumption for my Dometic CFX50 refrigerator. That is probably averaging at about a 13V output. I leave it on all the time running off 200w solar and a 100Ahr house battery.
Wheeljack,
Just trying to understand the math.
You are saying your Dometic would kill two 100W batteries a day if they are not recharged?
Or am I way off?

bill in tomahawk
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Old 10-31-2019, 05:32 PM   #7
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Default Re: Most efficient Fridge

My Engel 45 liter draws about 2.4A when running. Its duty cycle depends on ambient temperatures and the number of times I open the door for a beer.

At 20C and with "normal" door openings, it lasts for three days on a six-year old Lifeline 100 Ah battery charged solely by the alternator. At that time, the battery has discharged from 12.6 to to 12.000 VDC and I resort to charging.
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Old 10-31-2019, 05:53 PM   #8
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Default Re: Most efficient Fridge

Glass eye, got it.
Thanks.
So one 100W battery goes 3 days for 1.5 cubic ft. of cold.

Do you have a freezer?

bill
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Old 10-31-2019, 06:13 PM   #9
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Default Re: Most efficient Fridge

You have to be a bit careful about power consumption numbers with refrigerators.

Operation at 20 C / 68 F is pretty easy.

Operation on a hot summer day ( 45 C / 113 F) takes substantially more power.

What is the "real" temperature inside of your van on even a warm day, sitting in the sun to run the solar panels?

In this area, in the summer, a typical RV fridge will run just under 3 days on a 400 amp-hr x 12 volt high quality AGM battery pack with no power input.

With a substantial solar array, using ~ 150 - 200 amp-hr size house battery is possible, but it won't always be sufficient, especially if you hit a week of cloudy weather.

BTW - I like large refrigerators with freezers, so that might be a factor.

I am sure that someone will show that they have a super mini ultra fridge that lasts a month on a 50 amp-hr battery now that I stuck my neck out, but this info is from real world results of real customers.
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Old 10-31-2019, 06:23 PM   #10
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Default Re: Most efficient Fridge

Quote:
Originally Posted by HarryN View Post
You have to be a bit careful about power consumption numbers with refrigerators.

Operation at 20 C / 68 F is pretty easy.

Operation on a hot summer day ( 45 C / 113 F) takes substantially more power.

What is the "real" temperature inside of your van on even a warm day, sitting in the sun to run the solar panels?

In this area, in the summer, a typical RV fridge will run just under 3 days on a 400 amp-hr x 12 volt high quality AGM battery pack with no power input.

With a substantial solar array, using ~ 150 - 200 amp-hr size house battery is possible, but it won't always be sufficient, especially if you hit a week of cloudy weather.

BTW - I like large refrigerators with freezers, so that might be a factor.

I am sure that someone will show that they have a super mini ultra fridge that lasts a month on a 50 amp-hr battery now that I stuck my neck out, but this info is from real world results of real customers.
My propane fridge consumes the same power, 0.75A, whether it's 3C or 33C.
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