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Open Roads Forum  >  Tech Issues

 > AC/DC Compressor Refrigerators

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Dusty R

Charlotte Michigan 48813

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Posted: 01/12/19 03:40pm Link  |  Quote  |  Print  |  Notify Moderator

During the first energy crunch I took class, at a local community collage, on alternate source of energy. There is was said that Michigan ranked 47th out of the 48 continual states of available sunshine.
Have any of you campers with solar panels camped in Michigan and noticed less power being produced?

Dusty

MrWizard

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Posted: 01/12/19 03:59pm Link  |  Quote  |  Print  |  Notify Moderator

lookup Sunfrost refrigerators and/or solar off-grid fridge


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wa8yxm

Wherever I happen to park

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Posted: 01/13/19 06:14am Link  |  Quote  |  Print  |  Notify Moderator

Dusty R wrote:


Have any of you campers with solar panels camped in Michigan and noticed less power being produced?

Dusty


Do not have solar but Detroit Energery does. the Lapeer Solar Farm (It has a different name but you can google on that one and find it)

Big field of solar panels on the North side of I-69 east of Lapeer. I pass it often in the summer.


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theoldwizard1

SE MI

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Posted: 01/14/19 09:59am Link  |  Quote  |  Print  |  Notify Moderator

Ivylog wrote:

My EnergyStar Whirlpool 21 cuft draws 9 amps DC measure before the inverter...96 Watts. Its duty cycle is 40-45% confirmed with a KW meter...1.2-1.3 KW/day. 3X the size on 50% more power and half the price of DC powered units. Not a hard decision.

Very impressive numbers ! Clearly a great refrigerator for a large family !

theoldwizard1

SE MI

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Posted: 01/14/19 10:03am Link  |  Quote  |  Print  |  Notify Moderator

Dusty R wrote:

Have any of you campers with solar panels camped in Michigan and noticed less power being produced?

Most people camp in MI during the summer months and there are more hours of sun from May through September than any other time if the year.

Of course, many campsites in MI are under trees !

Add more solar panels and don't park under the trees !!

CJW8

Arizona

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Posted: 01/15/19 09:42am Link  |  Quote  |  Print  |  Notify Moderator

After some modifications my Norcold (nevercold) has been working well. If it ever fails I am going to replace the cooling unit with a compressor cooling unit from JC Refrigeration. They have several options including compressor only, Double boiler absorption, Hybrid, and helium filled.JC-Refrigeration


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landyacht318

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Posted: 01/15/19 03:59pm Link  |  Quote  |  Print  |  Notify Moderator

I have a 1.8 cubic foot Vitrifrigo c51is, now 6 years old which then was assembled in Italy, now tey re assembled in China, big surprise right?

. I boought DC only as if I have Ac available My meanwell powersupply can make more than enought to continue powering the fridge on DC as well as properly charging my battery.

The compressor is the Danfoss Secop BD35f, and these are variable RPM. more RPM means lesser duty cycle but bigger amp draw.

I run mine at the minimum 2K rpm and this starts at about 2.8 amps and declines to 2.2 amps nearer the end of the compressor cycle~ 5 minutes later. The duty cycle depends on ambient temperature the contents and how much I am opening the door of course, but keeping it closed half full at 32.5 f in 70F ambients it is about 4:30 on and 14 to 16 minutes off.

max RPM is 3500 rpm and I think this correlates to about 5.5 amps. not sure, never installed the resistor to increase rpm to that range and have no need to do so on this size fridge.

Next compressor size up for larger units is the Danfoss BD50. No experience with it.

I did have a Norcold with a sawafuji swing compressor that lasted about 5 years. Noisy vibrating annoying and not wuite as efficient..

mine averaged about 0.62AH each hour consumption in 70F ambient temperatures maintaining 32.5f interior teps as I use it. but I have added extra insulation on 5 sides, and my condenser ventilation is optimized with a better fan that has No chance of recycling air the condenser or compressor has already heated.

I've no experience running a residential fridge from an inverter, but I highly doubt I could ever get it to consume as little as my Danfoss powered 12/24 compressor fridge. I suspect a large enoough inverter and the extra batteries and charging required to power it would eat up any potential cost savings of a dorm/ residential fridge over as 12vDc fridge at least in the size fridge I am using.

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