RVelectricity: Preliminary report on Vitrifrigo Danfoss Compressor Refrigerator

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By Mike Sokol

Dear Readers,
After a few false starts and stops I’ve finally finished my first series of tests on an 8-cubic-foot Vitrifrigo DP2600 Danfoss compressor refrigerator powered by a single 100 amp-hour Ion-Ready Lithium battery from Briter Products. And the run times using the refrigerator’s built-in 12-volt connection are quite a bit longer than using a 100 amp-hour battery to power a 1,000-watt inverter which powers a residential refrigerator with a conventional compressor. Here are the basic numbers.

Briter Products 100 amp-hour Ion-Ready Battery discharged to 5% of capacity
Marinco 1,000 watt pure-sine inverter
Vitrifrigo 8 cu.ft. refrigerator using its 120-volt AC supply
Average Room Temp 70 degrees F
Refrigerator run time was 23 hours

Briter Products 100 amp-hour Ion-Ready Battery discharged to 4% of capacity
Galaxy 250 watt pure-sine inverter
Vitrifrigo 8 cu.ft. refrigerator using its 120-volt AC supply
Average Room Temp 70 degrees F
Refrigerator run time was 29 hours

Briter Products 100 amp-hour Ion-Ready Battery discharged to 16% of capacity
Vitrifrigo 8 cu.ft refrigerator using its 12-volt DC input
Average Room Temp 70 degrees F
Refrigerator run time was 38 hours

My basic compressor 16-cubic-foot refrigerator/freezer in the basement eats up around 100 watt-hours of power per hour, so that’s around 2.4 kW-hours per day. That suggests that even with an inverter that had 100% efficiency (which doesn’t exist, by the way) you might get 10 to 12 hours of running time for this refrigerator from this same Lithium battery/inverter setup which can provide about 1,200 watt-hours (1.2 kW-hours) of storage capacity. Of course, your mileage will vary depending on the size and efficiency of your residential refrigerator.

Of course, as you can see from the chart, hooking up the Vitrifrigo refrigerator’s Danfoss compressor directly to your 12-volt RV battery will be the most efficient way to run things since you don’t have the 1,000 watt inverter’s overhead of 15 watts just to run the fan, or the 250 watt inverter’s 10 watts of idle power it wastes. And, of course, you have to also factor in the 5% or so of additional power loss due to inverter inefficiencies.

The bottom line appears to be that a Vitrifrigo DP2600 8-cubic-foot Danfoss compressor refrigerator uses around 1/3 of the energy of a conventional 120-volt AC, 16 cu.ft. conventional compressor refrigerator. Interpolating the data a bit for the difference of the surface areas between the two refrigerator’s cubic foot capacities, the Vitrifrigo Danfoss compressor refrigerator uses less than 1/2 the power of a similar-sized conventional compressor refrigerator.

This suggests that the Danfoss compressor refrigerator makes boondocking without a generator using a single 100 amp-hour Lithium Battery such as the Briter Products Ion-Ready a possibility, even with just 200 to 300 watts of solar panels. More on this later after I set up my solar panels next month for more testing, but it looks very promising.

Let’s play safe out there….

 

 

Mike Sokol is an electrical and professional sound expert with 50+ years in the industry. His excellent book RV Electrical Safety is available at Amazon.com. For more info on Mike’s qualifications as an electrical expert, click here.

##RVT946

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TravelingMan

Gotta admit that the test kinda confused me when you tested an 8 cf against a 16 cf refrigerator…

I would suspect that with all things equal, the 16 cf would be 16 hours total run time per day against the 10-12 hours of the 8 cf unit per day. But alias, not all things are going to be equal.

It would be great if you can compare the 16 cf against the 16 cf. Is that possible? I like the potential though.

With the Vitrifrigo DP2600, are all components (fan, controls, compressor) 12V? You seem to suggest that the inverter could be bypassed.

With solar panels, it sounds like one could run the refrigerator during the day off that alone given enough capacity. We have 1300 Watts available per hour. It sounds like that at night, it would take just 1 (100A) battery to run the refrigerator all night. The other 3 (100A) lithium’s could take care of everything else with reserve to spare.

But what about the price comparison of the Vitrifrigo DP2600 against a Norcold or Dometic?

BTW…Keep up the great work you do. It’s much appreciated.

rick

After reading all this I’m so happy w my propane. refer and furnace.

Tony

Just a note. The battery is sold by Briter products not Briter technology. Also I am not sure that would be a good battery for most RV’s. Based on their specs it does not have a low temp charge cutoff. My understanding is if you try to charge a lithium battery below its low temp range (typically freezing) you will destroy the very pricey battery.

DAVE TELENKO

I see that his basement refer uses a conventional compressor maybe the one Mike took out of the kitchen 20 years ago when they got a new one! Modern day refers seem to use a lot-lot less energy. It has something to do with the use of inverter linear compressor. Theres a lot more that I don’t know but would like to know. I have a residential refrigerator & I get totally different readings when I use my inverter on my 2017 Forest River 34QS. I had my doubts as to what my Magnum inverter display was saying , like the draw was 7Amps! So I bought a clamp on meter & read the draw from the battery to the 2K magnum pure sine wave inverter & it said 12 amps & that was the total draw for whatever was running. According to the refer label it drew 6 amps @115 volts, well thats 72 amps @12 vdc! Can anyone tell me about this, or am I all wrong?
Snoopy

Michael

How does the efficiency compare when you use a cu. foot per KWH comparison? For equivalent volume, it uses 33% less power. That’s nothing to sneeze at, but how much renovation and inconvenience is that going to offset?

Harry

I can’t find a chart!

Don

Factoring in the cubic foot capacity of the two fridges, this isn’t nearly as impressive as it sounds, Mike. I don’t know about you, but I’m certain MY Co-Pilot isn’t going to live with an 8 CF fridge, no matter how much easier it makes boondocking. We’ll stick with our two-door Dometic, thanks anyway. At around 13 CF, It’s already barely big enough for our needs.

Cheter Brede

You didn’t mention running the 12 volt fridge on 120V with the inverter is a double conversion. 12 volt battery to 120V inverter to fridge internal converter to 12 volt compressor.