My new Apartment Refrigerator

[O C Diver]

Greetings,
Mr.OC. Nicely done.

Thank you!

Ok, so now you have us interested so we need more info and photos...

Ask and you shall receive.

Nice job. My guess is that you may not need the fan. Should cool by convection. After you have finished, test your new fridge and let us know the result.

As mentioned later in the thread, I think the added ventilation will offset the operating cost and maintain better operating parameters.

You are going with 120vt?
I am trying to stay with a 12vt fridge.....

20 years ago, that would be logical. Now a days, reduced energy consumption and infrastructure saves more than the simplicity of 12 volt units.

Ted

 

[O C Diver]

That's where inverters come in handy

Not for those of us that turn off our inverters when anchored for the night.

Get a better inverter....mine uses 0.7A/hour in standby mode overnight.

If in standby and not used it is 0.7Ah wasted

L

Well those of you wouldn't be doing that anymore if you had 120v refrigeration to keep running, now wouldn't you?

Oh joy, another dedicated inverter. The object is to have the fridge totally independent of the rest of the boat. I have 3 inverters on board now. The main 1500 watt inverter, a 300 watt inverter supporting one TV and a 120 vt outlet in the saloon and a 400 watt inverter supporting the fwd stateroom and TV. I shut them all off when I leave the boat for my 2 month visit in Atlanta.
At some point, the inverts' draw will exceed the capacity of the 3x4D batteries.

You need to consider an alternative way of looking at leaving the inverter on. If the refrigerator through the inverter significantly lowers overall power consumption, what difference does it make if you leave it on? If your total consumption with the inverter on 24/7 is less than the other way, why wouldn't you switch?

Having several small inverters for infrequent use isn't a bad thing. There is a point when one larger unit makes more sense and likely has more versatility.

Ted

 

[O C Diver]

Ventilation is key to a refer working well. I added a 50 mAmp fan to blow air in low to my refer compartment and added an exit vent on the top of the compartment. The refer will now freeze ice cream and works much better overall.

You are correct, lowering condenser temperatures improves performance.

Watching your post Ted, as I too am tired of the “Marine Rated” fridge.

Once you start looking at a better product, the marine / RV units seem way overpriced old technology. Get more for less.

Ted, looks like a clean installation. You are satisfied with the ventilation across the coils?

Very happy with the ventilation so far. Can also increase the fan speed (flow) if necessary.

Awesome post, great pics. Never thought about adding a cooling fan to the back of the refer for air flow.

Lots of advantage.

Looks really great, Ted. I'll be interested in your long term results, too.

When I installed my second fridge, the instructions noted that the heat was dissipated by airflow on the unit sides. I have noticed the heat on the left side of the fridge panel (but not the right side) and have open access on all sides for this heat transfer.

Do you feel any heat buildup on the sides after prolonged operation?

Many units including mine, pipe the gas from the compressor to the front and around both doors. This supposedly keeps moisture from forming around the doors when opened. I can't feel the sides of my unit, but heat dissipation off the back condenser seems to be working fine.

Ted

 

[O C Diver]

When you arrive in Stuart I will perform the ultimate test. If the beer is cold you did a good job!

I was expecting Captain FlyWright to volunteer for that duty (beer testing).

Great upgrade job Ted....well done all round.

Thanks!

Less power consumption and more cubic feet of refer space sounds like a winner.

I thought so.

Ted, when you have completed your installation please come to my boat and do the same. You will have my undying gratitude.

It's not everyone who offers to let me retrofit their boat. So generous of you.

Ted

 

[Comodave]

I looked at the link you posted for Summit. There is a stainless steel model that looks pretty much like yours that has a door latch listed as an option. Did not see it as an option on your model. Maybe they can sell you just the latch of the S/S model and it would work on yours...

 

[OldDan1943]

I thought so.



It's not everyone who offers to let me retrofit their boat. So generous of you.

Ted[/QUOTE]

I figure you have the experience so it will take less time. SMILE

 

[FlyWright]

I was expecting Captain FlyWright to volunteer for that duty (beer testing).

Hey, somebody's got to do it! It's a small but critical extra service I provide at no extra cost...except for the cost of the sacrificial beer consumed during the extensive testing.
If I come back to FP this year, I'll bring back my laser thermometer to find the very coldest one in the fridge or cooler!

Just say no to warm beer!

 

[O C Diver]

We’ve had an apartment-sized AC fridge/freezer for the past 6 years (about 11 cubic feet). I don’t know for sure when the OP installed it, but I’m guessing it’s at least 10 years old. I’d also roughly guess it’s been turned on and off 1,000 times...

Obviously, as liveaboards during the winter in our slip it works extremely well. When we go cruising, the fridge is always on underway, powered by the inverter. When at anchor, it’s a small tug of war between my wife and I about how much inverter time we use each day. She worries constantly about food spoiling, even though that’s rarely happened. So we run the fridge/inverter at anchor often enough to keep the fridge at about 42-45 degrees.

I’ve often wondered if an AC/DC unit would be more effective and efficient. But at this point, it’s just easier (and most affordable) to stay the course until such time as the refrigerator stops working.

Based on our experience, once you develop an “at anchor” fridge plan you’ll be perfectly happy. Unless you miss defrosting it every couple of weeks!

If you upgraded to a more energy efficient refrigerator, you could stop playing tug of war. Happy wife = happy life.

Already have an at anchor fridge plan, nothing changes. Why would you risk losing $10 worth of food to save $1 worth of energy?

Ted

 

[OldDan1943]

If you upgraded to a more energy efficient refrigerator, you could stop playing tug of war. Happy wife = happy life.

Already have an at anchor fridge plan, nothing changes. Why would you risk losing $10 worth of food to save $1 worth of energy?

Ted

$10 worth of food? Hmmm, you dont eat much do you?
In my case, between $200 and $300 a week. In my case, there is no 'tug o'war'. Food comes first. Of course I cheat a bit with my solar panels.
I guess the obvious way to solve this spoiled food thing is to eat faster.
Now if I can only figure out how to get my solar panels to charge the batteries at night. LOL
Maybe if I put a 120vt lamp on the solar panels at night to charge the batteries or dock near a street light??

 

[foggysail]

Ted—

GREAT JOB!!! I was fortunate some 10+ years ago when Summit had a 8.2/8.3 cuft fridge that required very little effort to fit it into the space where my old junk Norcold resided. It continues to allow us to enjoy rock hard ice cream, self defrost of course and the interior light.

The only problem I had was it could wheel out of the onboard home. My solution was to use two boards for the wheels.....as you did..... but the boards ended before the fridge was completely pushed into position allowing the rear wheels to drop off the boards. This locked it in place.

I power ours with a 3KW true sine wave inverter that runs 24/7 but only powers the fridge in the absence of dock or genny power.

And as to questions of ‘anchor fridge’, my 880 amp hr battery bank and 1190W of solar keeps us content for however long we wish to stay on anchor or mooring without concerns of battery charge status.

 

[Crusty Chief]

Moonfish and Crusty, an option you might consider is having your existing AC refer converted to DC. I just did this with my 12 cubic ft Kenmore AC power hog that was 15 years old. Sea Freeze in Bellingham converted it at a cost of about $2k. Haven't used it on these hook yet so actual power savings are unknown at this point.
___________________
Ken. Hatt Trick

Ken,

Thanks for the tip, but we have 12VDC now and it sucks, big time. And as far as Sea Freeze is concerned, they quoted me over 4.5K and wouldn’t guarantee that it will properly cool in 85-90 degree weather. And that was just for the unit, another boat buck or more to install as they recommended the compressor be installed elsewhere. It is a nice unit, but we are looking at being in the south for the next 4-5 years. I like the Summit fridge because if it goes south on me, its an easy replace.
The “New” Norcold that we installed a year and a half ago has never worked right and we have been cruising the PNW, wife isn’t happy and I’m tired of “Expensive Marine Refrigerator” that just dont work. She allready calls me the “Power Nazi” so if the fridge works like a real fridge should, then Ill just run the Genny a bit longer to keep those Rolls batteries charged up.
Cheers Bud, but I’m going the AC route!

 

[FlyWright]

Now if I can only figure out how to get my solar panels to charge the batteries at night. LOL
Maybe if I put a 120vt lamp on the solar panels at night to charge the batteries or dock near a street light??

Just dock near Ted's boat. There's enough reflected energy to keep your batts on a trickle charge.

 

[healhustler]

Excellent install, Ted. I still have my old Dometic 110/Propane unit that I simply can’t fault, but the previous owner fab’d a rather complex ventilation setup that will come in handy when I copy your project. Thanks for being so thorough about the details.

 

[Roamer Blue]

Excellent report, and kudos for breaking out of the mold!


With the massive improvements in home style refrigerators power consumption, available everywhere, at a cost less than many of us fill the boat fuel tank for a day's outing...


And the cheap availability of reliable inverters...



Why would anyone, in 2018, purchase that CRAP that masqueraded as refrigerators from the past?


Box store 120 AC volt refrigerator that fits down the hatch please!

 

[koliver]

Great job Ted!

Those who want to copy this improvement should also note that Ted was going from the infamous Norcold AC/DC to AC domestic.

Those who have a Danfoss style DC unit will not see a savings in consumption like Ted will see.

I had a look at the owner's manual for his old Norcold,

manualslib.com/manual/1313103/Norcold-De-Ev-0041.html?page=12#manual

The Power unit is the same as the one originally in my old Norcold. I measured DC consumption at over 10 amps whenever it was running. Throwing that power unit away and putting in a Danfoss DC unit brought consumption down to 2.7 amps. The time of running didn't change, as that was determined, as Ted has pointed out, by the frequency of opening the door and the quality of the insulation.

Looks like the power unit in Ted's old Norcold is an inverter, powering the AC only compressor when on DC, which is what my fridge guy told me mine was.

I understand that some newer Norcolds have a proper DC setup, but mine and now Ted's were the old technology.

Ted, is there any way you can get an accurate measure of the total power consumption of your new setup, counting inverter use, when only the fridge is running? That would be interesting.

Ted, as my fridge is really old, the plastic door hardware has failed and I had to make replacements out of aluminum last year, but I didn't get around to fabricating a new door latch. My experience so far has been that the only direction that could cause the door to be flung open is if I was able to accelerate forward very quickly. That hasn't occurred, even though I have been out in conditions that turned me back twice, rolled so that had to re-secure my kayaks, my fridge doesn't come open without a latch and on original magnetic strips in the seal. I think yours will be OK without any latch.
Your installation is in exactly the same position in the boat as is mine.

 

[foggysail]

To many of us that have equipped our boats with both a solar system and an adequate battery bank, power consumption may not be important; it is not important to me. The benefits to us offered by a domestic refrigerator far out weighed what currently available marine refrigerators offer.

Those benefits that inspired us to move to a domestic refrigerator were cost, available physical size to minimize cabinetry rework, self defrost along with an interior light. A puny interior light may not be a factor to others but it was added consideration to us.

Sure, solar is claimed to have limitations during shading, clouds and rain. I have not found that to be a concern, our panels continue to provide charging current in those conditions, just not as much as provided with uninhibited sun shine. If there is illuminance which there always is during normal daytime, the panels will provide charge current.

 

[BruceK]

..My experience so far has been that the only direction that could cause the door to be flung open is if I was able to accelerate forward very quickly. That hasn't occurred...

Yes Keith, little risk of that with our beloved trawlers.
A very informative post, thank you.

 

[FoxtrotCharlie]

Yep, our 'new to us' boat came with a brand new 10ft Hisense 120v fridge/freezer with it's own inverter! works great - cold beer and cold wine (white). And yes Al, no one lets a friend drink warm beer

And if I could post a photo , I would post a pic of our son 4 weeks after his accident - sitting on a bench (after he walked there) in front of Methodist Rehabilitation Center (Jackson, MS - wonderful facility) with his dog that came to visit. With over 20 fractures, and a TBI (traumatic brain injury), he may be released to out-patient care in a few days Chief neurologist met with him and us a week ago when he entered the rehab center and talked with our son for an hour. Then said 'before this I only looked at your CT scans, your exrays and your injury files - I fully expected to come into this room and find someone in a semi-vegatative state, instead we have just had a 60 minute coherent conversation - with your injuries this should not be possible'. And today he explained to me in detail how I can install a wifi network on our boat. He plans to be back at work within a few weeks (employer previously agreed to pay his full salary for 6 months) Yes, miracles do happen

 

[O C Diver]

Great job Ted!

Those who want to copy this improvement should also note that Ted was going from the infamous Norcold AC/DC to AC domestic.

Those who have a Danfoss style DC unit will not see a savings in consumption like Ted will see.

I had a look at the owner's manual for his old Norcold,

manualslib.com/manual/1313103/Norcold-De-Ev-0041.html?page=12#manual

The Power unit is the same as the one originally in my old Norcold. I measured DC consumption at over 10 amps whenever it was running. Throwing that power unit away and putting in a Danfoss DC unit brought consumption down to 2.7 amps. The time of running didn't change, as that was determined, as Ted has pointed out, by the frequency of opening the door and the quality of the insulation.

Looks like the power unit in Ted's old Norcold is an inverter, powering the AC only compressor when on DC, which is what my fridge guy told me mine was.

I understand that some newer Norcolds have a proper DC setup, but mine and now Ted's were the old technology.

Ted, is there any way you can get an accurate measure of the total power consumption of your new setup, counting inverter use, when only the fridge is running? That would be interesting.

Ted, as my fridge is really old, the plastic door hardware has failed and I had to make replacements out of aluminum last year, but I didn't get around to fabricating a new door latch. My experience so far has been that the only direction that could cause the door to be flung open is if I was able to accelerate forward very quickly. That hasn't occurred, even though I have been out in conditions that turned me back twice, rolled so that had to re-secure my kayaks, my fridge doesn't come open without a latch and on original magnetic strips in the seal. I think yours will be OK without any latch.
Your installation is in exactly the same position in the boat as is mine.

Hi Keith,

We are in agreement regarding the part about my old compressor and how it's powered. Theoretically the same freezer with the Dan Foss compressor will do better on power consumption. Where I respectfully disagree with you is the insulation. IMO, the base power savings (amount of energy used to maintain temperature without opening the door) will be greater because of the insulation. If you look at the Sun Frost line, efficient compressors only get you so far. Insulation is what gets their home size refrigerator down to a half a kilowatt of energy consumption per day. Simply, Norcold's insulation sucks. If nobody ends up taking my Norcold, I'm going to dissect it to see how bad it really is.

I'm going to be on a mooring tomorrow night and out to dinner with a friend, so will see what the Victron SOC gauge measures.

Ted

 

[FF]

"Insulation is what gets their (Sun Frost) home size refrigerator down to a half a kilowatt of energy consumption per day.

The off grid folks that will pay for low power consumption are willing to have a larger box with better (expensive) insulation and a smaller interior.

Small fridge interior is not what sells for home use.

 

[OldDan1943]

This discussion has centered around electrical refrigerators.
An alternative just might be a propane refrigerator.

https://www.gas-refrigerators.com/unique-off-grid-6-cubic-foot-propane-refrigerator

I am not recommending one or even considering one but, it is an alternative to electric.

 

[OldDan1943]

Per the NovaKool fridge..... Standard equipment on the American tugs
On another board, people are suggesting the addition of insulation foam board, on the sides, and increasing the air flow across the condenser coils via the installation of a 12vt fan that runs with the compressor, increasing the exhaust of the heated air via the installation ducting and of a vent out the back of the fridge cabinet.
I have yet to read a definitive statement of success but, the suggestions are headed in the right direction.

Maybe it is just me but, I would also suggest a small LED, on the front of the installation, that turns on when the compressor is running. I dont hear to well anymore and it would be easier to watch.

 

[foggysail]

I would also suggest a small LED, on the front of the installation, that turns on when the compressor is running. I dont hear to well anymore and it would be easier to watch.

Yeah Dan, takes the fun out of life when there is no drying paint to watch

 

[OldDan1943]

Yeah Dan, takes the fun out of life when there is no drying paint to watch

LOL, I am supposed to wear 2 hearing aids. They are usually 'somewhere else' and not in my ears.

I do have an LED for my F/W pump to detect a water leak.

 

[foggysail]

LOL, I am supposed to wear 2 hearing aids. They are usually 'somewhere else' and not in my ears.

I do have an LED for my F/W pump to detect a water leak.

Yes, I have to wear them also. Got tired of spending big bucks for Siemen Pures (~$2K/pair) on EBay. Now enjoy devices for under $100, again Ebay that perform about as good as the expensive ones. Something you may want to checkout.

 

[OldDan1943]

Yes, I have to wear them also. Got tired of spending big bucks for Siemen Pures (~$2K/pair) on EBay. Now enjoy devices for under $100, again Ebay that perform about as good as the expensive ones. Something you may want to checkout.

One would think there would be a iPhone app to use in conjunction with the new wireless ear pieces.

 

[Sabre602]

...Why would anyone, in 2018, purchase that CRAP that masqueraded as refrigerators from the past?....

Yup, this thread is a great reminder that thinking outside the box (the ice box in this case) is a great way to gain access to new technology that old traditions haven't caught up with. Hell, even the guys over at the Wooden Boat forum are talking about structural PLASTIC framing members! We've seen the same with such things as paint and caulk and nav electronics; this stuff doesn't have to be from the marine store to work well!

The fellow that owned Kingfisher before us had a modern ARB (swing compressor) unit aboard. His "new" boat, an old Monk trawler of about 50 ft, is being remodeled in a way that honors its age and heritage but incorporates such new technology. In his case, he incorporated pull-out drawers in the galley for two ARB fridge/freezers, replacing the old energy hog marine fridge that was there, gaining greatly increased capacity at a fraction of the energy expended previously.

 

[FF]

WE have used propane on out FL based boat and with a proper install can say it solves 99.9% of electric consumption problems.

A now 15lb ( used to be 20lbs) bottle does 3 weeks of good hard ice cream , in silence .

The range is also propane , we carry 4 or 5 bottles and the range use is not measurable.

If new boat buyers demanded propane it would be far more common.


****


For folks with what they hope is a good reefer box that want to measure its power requirements , its easy.

Place a large 25-40 lb block of ice that has been weighed on a shelf and close the door .Wait 24 hours and weigh the block as it has now cooled down the chest.


Then close the door for 2-3 days , open and weigh again. .
Under 5 lbs of melt per day usually is OK for electric battery refrigeration.

Haven't looked it up ,but I think there is 144BTU in each pound of ice melted, so a relatively accurate method of assessing cooling demands exists.

Block ice is better than a big bag of cubes for the test.

 

[wwestman]

The main issue with propane frigs is flame. Every RV sitting on the side of the road on fire is caused by the propane frig, or so I have been told. The whole idea of having an open flame, not monitored, gives me the shakes. Can't pull over and jump out as easily as an RV.

 

[O C Diver]

An update:

So I haven't been able to get a reasonable test through the night for power consumption of the inverter and refrigerator only. The last two nights with inverter, refrigerator, NMEA 2000 network, AIS, anchor light, microwave standby loss, laptop & cellphone chargers, and who knows what else, drew my battery back down 4% in about 7 hours. This morning, with everything sitting at idle from the previous night, I was drawing a little over 6 amps on the Victron SOC meter. Turning everything off except the inverter, refrigerator, refrigerator venilation fan, bilge pump monitoring display, and the radio memory backup circuit, I was down to around 2.75 amps. For a 900 AH battery bank, I'm extremely pleased!


More to follow....

Ted