Mishto - Compressor Fridge

shakey55 · Senior Member

Mishto - Compressor Fridge

Mike Harding · Guru

A quick Google suggests it's not an inverter fridge but rather a simple on/off type.

Power consumption is highly dependent upon the ambient temperature of your environment but (assuming it's a fridge/freezer) it will be roughly 1kWh per day for which you will need at least 200Ah of battery and around 800W of solar - again depending upon your local weather.

Dick0 · Guru

Specs here if the same as yours..

165L Portable Fridge Freezer 12V 24V 240V For Camping Car Boating Caravan Bar 9352590003291 | eBay

Mike Harding · Guru

Dick0 wrote:
Specs here if the same as yours..
165L Portable Fridge Freezer 12V 24V 240V For Camping Car Boating Caravan Bar 9352590003291 | eBay

It quotes a power consumption of 170Wh/24h!

For a fridge/freezer!?

Clearly they are running it in the Artic with an ambient temperature of -20C.

Whenarewethere · Guru

Mike Harding wrote:
Dick0 wrote:
Specs here if the same as yours..
165L Portable Fridge Freezer 12V 24V 240V For Camping Car Boating Caravan Bar 9352590003291 | eBay
It quotes a power consumption of 170Wh/24h!
For a fridge/freezer!?
Clearly they are running it in the Artic with an ambient temperature of -20C.

Agree.

170 Wh/24h, I believe the technical term is BS!

My 28L fridge I have worked very hard on with extensive modifications uses about 180Wh/24h & that's running it at 5°C.

The Travelling Dillberries · Guru

Type	165L Fridge Freezer
Compressor	ALPICOOL
Refrigerant	R134a 45g
Rated Power	75W
240V consumption	0.17kWh/24hrs
12V consumption	80A/24H approx
Max. ambient temp	38°C
Foam vesicant	C5H10/C-pentane
Temperature drop	30 degrees
Power Input	12/24/240V

Specs for 12vdc say 80A/24hr.Also soft start.

Whenarewethere · Guru

12 volts:

80AH per 24 hours = 0.960kWh

240 volts:

per 24 hours = 0.170kWh

So 5.64 times more efficient running on 240 volts. Somehow I don't think so.

shakey55 · Senior Member

So what you are all saying is, that there are better more efficient fridges around

Im still learning, so if I intend using off grid, I need a lot of solar to keep batteries up to the task of off grid camping while using this fridge, is that what you are telling me?

Whenarewethere · Guru

The reason for so much solar is that when you have inclement weather it will produce next to nothing. So if you can get any solar great (a good MPPT 2 in series to squeeze low light days), but more importantly is that you can replenish a deeply depleted system quickly with enough solar.

Have you got the roof area for X amount of solar & the payload for additional solar panels.

The other option is do you really need a freezer. Just running a fridge will reduce energy consumption quite a bit.

Assuming the fridge has a condenser on the back with a fan. You could add additional insulation to the sides. Also the door while at it.

It is always a good idea to have a DC-DC charger (near batteries) so if you have crap weather, although not ideal but at least you can run the engine to charge up a bit. Also it will charge when driving.

At 80AH per 24 hours I would be looking at 300AH, but again, how much payload do you have. It's going to have to go over the weight bridge before you start doing anything so you know what you have to play with.

Mike Harding · Guru

The newer "inverter" fridges use less energy that conventional on/off control fridges but only by around 15% iirc so your energy consumption would drop by about 150Wh per day which probably isn't worth buying and fitting a new fridge for.

As WAWT suggests the freezer is the killer and if you could manage with only a fridge energy consumption would drop to perhaps 250 to 400Wh per day.

This is the problem with compressor fridges in caravans; they do consume a relatively large amount of power which is why many prefer gas fridges which are not as efficient but will run for two weeks on a 9kg gas cylinder.

I've been doing some experiments in running my camping compressor 65L fridge/freezer at -18C/+2C on 240V for the past few weeks with 210Ah battery and 800W solar into a Victron MPPT and I have only needed to start the generator for additional charging twice. When I eventually switch to a compressor fridge in the van I'll go for 300Ah battery but still carry the gen. Modern solar, for camping, is great and largely effective but it's not a simple, easy or cheap sole solution as the enthusiasts so often portray. You only need flat batteries once and that's a freezer full of food into the bin.

Whenarewethere · Guru

Mike Harding wrote:
I've been doing some experiments in running my camping compressor 65L fridge/freezer at -18C/+2C

Have you tried additional insulation.

Mike Harding · Guru

Whenarewethere wrote:
Have you tried additional insulation.

Not worth doing for this experiment but I may do when I fit a compressor fridge into the van.

shakey55 · Senior Member

Whenarewethere wrote:
The reason for so much solar is that when you have inclement weather it will produce next to nothing. So if you can get any solar great (a good MPPT 2 in series to squeeze low light days), but more importantly is that you can replenish a deeply depleted system quickly with enough solar.

Have you got the roof area for X amount of solar & the payload for additional solar panels.
I have two panels on roof which I think are 100 watt (not sure - how can I be sure) I intend buying additional panels (portable)

The other option is do you really need a freezer. Just running a fridge will reduce energy consumption quite a bit.

Assuming the fridge has a condenser on the back with a fan. You could add additional insulation to the sides. Also the door while at it.

It is always a good idea to have a DC-DC charger (near batteries) so if you have crap weather, although not ideal but at least you can run the engine to charge up a bit. Also it will charge when driving.
When I buy portable panels I will be installing quality solar charge controller (close to batteries). So as a backup I also need a decent DC2DC charger near the batteries.

At 80AH per 24 hours I would be looking at 300AH, but again, how much payload do you have. It's going to have to go over the weight bridge before you start doing anything so you know what you have to play with.
Recently been over weigh bridges having had ATM upgrade from 2660 to 3000 kgs and already have 360 amp of AGM battery power
Not changing to Lithium until current batteries die

-- Edited by shakey55 on Saturday 1st of October 2022 06:39:36 AM