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Old 10-06-2019, 06:18 AM   #31
marklg
 
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Default Re: Vitrifrigo C115IBD4-F-1 Compressor Fridge

After more testing with the Vitrifrigo, this is what I have.

There is an inch of ISO foam board on the top and back of the unit. There will likely be no room on the sides when installed, so I did not put any insulation there.

I put a 3/16 piece of foam board in the drip tray below the freezer evaporator.

The thermostat is set to about the 8:30 position.

The Fridge varies from 36 to 38 degrees F. The freezer varies from -3 to +2 degrees F. I chose these for a nominal freezer temp of 0 degrees F and a nominal fridge temp of 37 degrees F, allowing it to rise to about 40 degrees F if you open the door and get things out / put things in.

Under these circumstances, the unit uses about 48 Ah per day at 13V or about 625 Wh per day with an ambient temp of about 75 degrees. It uses about 45 W when on, so it is on about 58% of the time. If it was set to a few degrees warmer, it would be on less, but we want it to just work under typical usage and not worry about our food.

I'm considering this done. It is operating exactly as I want.

A 1/2 piece of Iso foam board was too thick. The fridge got too warm compared to the freezer.

Regards,

Mark
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Old 10-06-2019, 12:24 PM   #32
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Default Re: Vitrifrigo C115IBD4-F-1 Compressor Fridge

You will probably find that you need to adjust your thermostat knob twice a year or so. In the spring and the fall. Otherwise the fridge will get too cold/hot.
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Old 10-06-2019, 05:06 PM   #33
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Default Re: Vitrifrigo C115IBD4-F-1 Compressor Fridge

Quote:
Originally Posted by Midwestdrifter View Post
You will probably find that you need to adjust your thermostat knob twice a year or so. In the spring and the fall. Otherwise the fridge will get too cold/hot.
From what I've seen, with the extra insulation, it holds the freezer within the set temp range and the fridge is offset an amount from the average freezer temp. So, I think I may better compensate for this effect by changing the insulation in the drip tray, thicker or thinner.

I hope that this effect is not too large. Here in AZ, the temperature varies 30 degrees F between night and day when the sun is out, which is most days. Any vehicle heats up inside way more than that. So, on any given day, the ambient temp around the front and sides of the fridge will vary a lot, maybe between 50 and 100 degrees. The temp at the back where the condenser coil is will vary 30 degrees.

With the absorption fridge, the inside temp would vary by 20 degrees, which was unacceptable. I bought this one hoping that effect would be way smaller. Since it is only running about 58% of the time with an ambient temp of 75, there should be way more margin with this fridge.

My thinking is that the changing temp of the fridge with outside temp is due to a few factors.

A major one is the heat flow into the fridge / freezer due to the temperature differential between the outside and inside and the insulation factor. That heat flow will vary proportional to the temperature differential and the compressor will run more or less to compensate. The freezer and fridge have different temperatures and insulation, so they won't change exactly the same.

The other factor is the efficiency of the cooling unit. This is dependent on the ability for the condenser coil to dissipate heat. That is proportional to the temperature differential between the coil and the ambient air and the airflow through the coil. I have outside vents and fans to try to limit this variability. I can turn the outside fan up when the temperature gets hotter, hopefully limiting this effect.

It is very difficult to put numbers to both of these effects without way more measurements than I am willing to do, so I will just hope. There are likely other effects I have not considered, but I think these two are the major ones.

Regards,

Mark
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Old 10-06-2019, 06:31 PM   #34
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Default Re: Vitrifrigo C115IBD4-F-1 Compressor Fridge

In my fridge I would get about 5 degrees variance from summer to winter. Not huge, but enough to cause a bit of frost in the items closest to the freezer. Generally I just adjusted the know one setting in 8. so 4 for winter, 5 for summer.
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Old 10-06-2019, 06:57 PM   #35
outbound
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Default Re: Vitrifrigo C115IBD4-F-1 Compressor Fridge

in my '06/2500 van, i have a 5.6cuft GE refrig (with fan-coil condenser) that i cut the 120vac compressor out of and put in a danfossBD35,same as whats in the smaller vitrifrigo's, with the BD50 in the larger units.. (and yeah, i'm a refrig mechanic/tech, for over 30years)

in the typical summer wx we get here (desert, upwards of 105degF) it will use appx 45-60ah/day, or appx 2amps/hr.
i keep the lower part of the box at 29-36 and it's make ice cubes in appx 8-12hours (longer in cooler, shorter in warmer temps)

this time of year(temps down into the 40's), it's using appx 12-15ah overnight and no matter what the wx, 200w of PV have the batts full by noontime,
with no other loads (on a 400ah housebank)

have installed or serviced vitrifrigo units for over 20years.
coastal climate control is the US importer/distributor and Rob &co = very good outfit to deal with.
their stuff is some of the best available - for either RV's - or yachts, where most of my experience with them comes from.

IMHO - bottom line on 12vdc vs LPG refrigeration?
if you've got an LPG unit that is working, run it til it croaks.
but when it's time to replace it, nothing beats a danfoss-equipped refrigerator (on ocean yachts OR land yachts)
not when with a couple hundred watts of PV and 200ah of batts one can run a refrig in 100deg heat and make icecubes in 8-12hours

and...

NO NEED FETCH PROPANE...
(or worry about the dozens and dozens of different ways LPG units can ruin your day..)

just my

YMMV
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Old 10-06-2019, 08:11 PM   #36
marklg
 
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Default Re: Vitrifrigo C115IBD4-F-1 Compressor Fridge

Quote:
Originally Posted by outbound View Post
in my '06/2500 van, i have a 5.6cuft GE refrig (with fan-coil condenser) that i cut the 120vac compressor out of and put in a danfossBD35,same as whats in the smaller vitrifrigo's, with the BD50 in the larger units.. (and yeah, i'm a refrig mechanic/tech, for over 30years)

in the typical summer wx we get here (desert, upwards of 105degF) it will use appx 45-60ah/day, or appx 2amps/hr.
i keep the lower part of the box at 29-36 and it's make ice cubes in appx 8-12hours (longer in cooler, shorter in warmer temps)

this time of year(temps down into the 40's), it's using appx 12-15ah overnight and no matter what the wx, 200w of PV have the batts full by noontime,
with no other loads (on a 400ah housebank)

have installed or serviced vitrifrigo units for over 20years.
coastal climate control is the US importer/distributor and Rob &co = very good outfit to deal with.
their stuff is some of the best available - for either RV's - or yachts, where most of my experience with them comes from.

IMHO - bottom line on 12vdc vs LPG refrigeration?
if you've got an LPG unit that is working, run it til it croaks.
but when it's time to replace it, nothing beats a danfoss-equipped refrigerator (on ocean yachts OR land yachts)
not when with a couple hundred watts of PV and 200ah of batts one can run a refrig in 100deg heat and make icecubes in 8-12hours

and...

NO NEED FETCH PROPANE...
(or worry about the dozens and dozens of different ways LPG units can ruin your day..)

just my

YMMV
I'm in pretty much in agreement. I'm replacing an absorption fridge that basically works like crap. I've got 235W of solar panels on the roof, an additional 400W of flexible panels I can put on top of the awning and 400 Ah of lithium batteries. Effectively, that system will run the fridge and other stuff forever, even with a couple of cloudy days. I still use Propane for heat, cooking and hot water. My limitation is the size of my water tanks, about two days of showers and dishwashing before needing to dump and get more fresh water.

The absorption fridge was a real PITA in our recent 5 week trip. Often had to get ice and put it in the fridge to get the temp back down.

Regards,

Mark
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Old 10-06-2019, 09:22 PM   #37
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Default Re: Vitrifrigo C115IBD4-F-1 Compressor Fridge

Wow that is awesome you have the skills to make your own dc fridge Outbound!
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Old 10-15-2019, 07:10 PM   #38
marklg
 
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Default Re: Vitrifrigo C115IBD4-F-1 Compressor Fridge

Quote:
Originally Posted by marklg View Post
After more testing with the Vitrifrigo, this is what I have.

There is an inch of ISO foam board on the top and back of the unit. There will likely be no room on the sides when installed, so I did not put any insulation there.

I put a 3/16 piece of foam board in the drip tray below the freezer evaporator.

The thermostat is set to about the 8:30 position.

The Fridge varies from 36 to 38 degrees F. The freezer varies from -3 to +2 degrees F. I chose these for a nominal freezer temp of 0 degrees F and a nominal fridge temp of 37 degrees F, allowing it to rise to about 40 degrees F if you open the door and get things out / put things in.

Under these circumstances, the unit uses about 48 Ah per day at 13V or about 625 Wh per day with an ambient temp of about 75 degrees. It uses about 45 W when on, so it is on about 58% of the time. If it was set to a few degrees warmer, it would be on less, but we want it to just work under typical usage and not worry about our food.

I'm considering this done. It is operating exactly as I want.

A 1/2 piece of Iso foam board was too thick. The fridge got too warm compared to the freezer.

Regards,

Mark
Same setup with 2 pieces of 3/16 foamboard in the drip tray.

The Fridge varies from 38 to 40 degrees F. The freezer varies from -2 to +4 degrees F. 565 Watt-Hours / Day.

Regards,

Mark
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