Hi
@mikerezny , Any help you could give us would be appreciated. We are in North Queensland and our 3 way fridge really struggles up here, sits around 7 degrees most of the day and won't freeze anything, mrs can't have ice cream.
I am very interested in your fridge mods. My first mod here was going to add a sail track to the fridge side and fit as per your picture. Then add an awning. I am just unclear on how to fix to side of van or pop top. ( We have an expanda ) Second mod was the fridge fan. I am not very electrically minded and struggle a bit with this type of thing. Is there any chance you can take some photos of the wiring you have done so I can utilise in ours. Also how is your sail track mounted to the van?
Hi
@Jeremy Johnson,
here is a list of mods I have done and tips to improve the performance of the Dometic 2350 fridge fitted in our Penguin.
I will try to take some photos later this week and post them here.
With all this, the fridge will cool even on 12V. Haven't run it much on 240V. On gas, even in 39C heat over three days, the freezer kept ice-cream frozen. We can mostly keep the fridge below 6C. The freezer is always between -12C and -18C whenever I have checked. I just have a small mechanical thermometer in the freezer.
1: Bought a shade cloth. The Penguin has a standard sail track fitted along all four sides of the roof. So that was easy.
Ours runs the full length of the van and the fridge vents are mostly in the shade.
2: Fitted a 120mm Be Quiet Pure Wings II fan from PC case gear. Picked up 12V from the stove, put in an inline fuse and a
fitted a 55C Normally Open thermostat which is fitted on the pipe at the top of the fridge before it bends around.
Mounted the fan on the top vent, to the far left, with four cable ties. The fan draws about 100mA. At worst case it would use about 2.4Ah per day. It runs almost continuously on warm to hot days and cycles on and off on warm nights.
3: Made sure I ran heavy cable from the tug battery to the 12 pin plug. The voltage difference between the tug battery and the fridge terminals is 0.81V. After a couple of hours driving (12V operation), the fridge is always colder than when we started. It is not unusual to come home or arrive, with the fridge around 1C.
4: Mounted a small voltmeter across the fridge terminals. We check the voltage and compare it with the battery voltage in the tug as part of our check after we hook up. Luckily, out Prodigy Brake controller will display the battery voltage. If both readings are the same, we have a problem. Probably forgot to switch the fridge over to 12V. Or, a burnt out 12V element. It is usually 0.7-0.9 V difference. Any more than that and there will be a loose connection that needs to be found. Haven't had that happen yet. After 3 months, I found the screws on the 12-pin van plug were semi tight. If it happens again, I will be fitting Anderson plugs.
5: Filled in all the gaps between the fridge and the walls and floor to stop hot air from the back of the fridge mixing with cold air from the sides of the fridge.
6: Put aluminum-backed polyester insulation around the vertical boiler on the left-hand side of the fridge and along the top. This make the boiler more efficient and reduces the amount of heat reaching the cabinet walls. Before this, we found that, on hot days, that the heat conduction along the cabinet walls was significant.
7: There is a drain channel inside the fridge that runs under the cooling fins. Seems to me that this also collects the coldest air and channels some of it down the drain hose. I fitted a loose fitting bung into the drain hole, reducing the amount of cold air that could escape. Have never had any problem with water building up and not getting away.
8: Fitted a small LCD external temperature gauge. On of those indoor-outdoor types. The outdoor sensor is wired into the fridge and cable-tied to one of the shelves. that way we can always see the van indoor temperature and the fridge temp.
9: Found plastic boxes to fit all the shelves, including a good one that turns the bottom shelf into a crisper tray. The idea being to reduce the amount of cold air escaping and warm air entering every time the fridge is opened. This make a big improvement. Most noticeable is how little the fridge heats up in the middle of the day after the fridge is opened and closed and how quickly it recovers to its previous temperature.
10: Keep the fridge filled as much as possible. More stuff, means the fridge has more cold mass and can recover more quickly after the door is opened. Also more stuff means less cold air to escape. Less air coming in means less condensation on the cooling fins and less icing up.
11: Open the door as little as possible and open and close it slowly to reduce the air circulation. Especially in the middle of the day when the outside air temperature is highest.
12. If we have room in the freezer, we put in a freezer block. On hot days, we take it out of the freezer and put it in the fridge after we have finished lunch. Then put it back in the freezer before we go to bed.
13. Try to avoid putting room temperature items into the fridge during the day. We put drinks, UHT milk, dinner leftovers etc in just before we go to bed.
14. We take things out of the freezer and put them in the fridge to defrost first thing in the morning.
15. The only pre-cooling we do is to turn the fridge on to 240V a couple of hours before we leave and ensure that everything going into the van freezer comes out of our house freezer and everything going into the van fridge comes out of our fridge.
16. When we take things out of the fridge, we try to get them back into the fridge as soon as possible, but being midfull to not keep opening and closing the fridge more than necessary.
Sounds like a lot of effort but it is easier than it seems. In my childhood, on Fraser Island, we had a kerosene fridge, and I remember being clipped behind the ears more than once for opening the fridge more than necessary. So, some of the above ideas were instilled into me from those days. More lately, friends of ours live in the Glass House mountains without mains power, and they have a gas fridge which also needs a bit of care if you want to keep things cold or frozen.
But with all this, we have never had any problem keeping food in good condition. Never had to throw anything out, or had anything in the freezer melt. Always had cold drinks, frozen ice-cream etc. We have also never had any problems with things freezing in the fridge.
I hope this is of some help. I will try to get some photos. Don't hesitate to ask for more information or better explanations.
kindest regards
Mike