So, a few days ago I got an Alpicool TAW55 Dual Door Dual Zone Portable Car Fridge Freezer With Wheels.
Here's some info from my first few days getting to know it and testing it out. Got to say, so far I'm very impressed with it!
Test environment:
My van has a 180W solar panel, a Victron Bluesolar PWM (DUO) LCD&USB solar regulator (that charges both the leisure battery & vehicle battery at the same time on a 70/30 split), and a 180A AGM leisure battery. During the day, even when overcast, the solar panel provides enough energy to keep the vehicle battery topped up, and the leisure battery topped up whilst it also powers the TAW55. The TAW55 is set to ECO mode, which uses less power than the MAX mode. It's set to H cut out/in, which means it will cut out when the battery reaches 11.1v and cut in when the battery reaches 12.4v. The TAW55 was first brought to operating temperature using mains power before moving it into the van and connecting to the 12v supply.
The test load:
The left compartment, acting as a fridge, is a third full with drinks. The right compartment, acting as a freezer, is a quarter full with ice packs. Both compartments can be set to at as fridges or freezers, so two fridges, two freezers, or one of each as in my test.
Test duration:
Three days and two nights continuous running.
Noise:
When the compressor/fan is running it's almost silent in the van. I have to put my ear next to the compressor/fan compartment to hear anything and even then it's very quiet!
Fridge observations:
The left compartment, set to +8C, holds the temperature very well, it seems to use almost no power! See the graph.
Freezer observations:
The right compartment, set to -10C, averages -10C throughout the day and night whilst cycling through -12C to -8C in about 20 to 25 minutes with the compressor/fan running for about 5 minutes in each cycle. See the graph.
Power usage:
Very little. During the day what little is use is quickly replaced by the solar panel. Throughout the night it seems there's only about a 0.4v to 0.6v drop on the leisure battery, which is quickly topped up by the solar in the morning. See the graph.
Graph:
The volts are as displayed on the TAW55 App and are generally 0.2v below that on the van display. The outside temperature is outside the van as reported by the Met Office. The left and right temperatures are as displayed on the TAW55 App with a linear average calculated by the spreadsheet.
Notes:
I thought I felt some cold air coming from the edges of the right compartment lid when it was closed, and I suspected a poor seal. So, I added an extra seal on to the right lid and that initially appeared to reduce the temperature loss rate but after several more observations and recordings it seems to have had little effect. I then put extra insulation on top of the lids and that appeared to have no effect either.
The Alpicool App is great for setting the TAW55, much easier than pushing the button combinations on the TAW55 itself.