Bests & Worsts Reviews from Amazon

Just guessing, but it seems to be a C15 with a taller lid for the extra space. Not as convenient as an actual 20 liter tub. Max watts seen so far is 59w while running on the provided A/C cable/transformer. Draws .7 watts when the unit is on and the compressor is off. In both Eco & Max modes, compressor seems to kick in when the temperature rises 2 degrees. Seems to draw a few more watts when in Max mode. The lid looks too much like a cushion and may tempt people to sit on it. The following values where with the unit plugged into A/C using the supplied transformer that was plugged into a watt meter, so values on a battery may be different. Tests where done indoors, with ambient temperatures ranging from mid 60's to mid 70's. Due to the ambient temperature varying, and each test only being done once, these comparisons are only approximate. In Max mode, set to -20, it averaged about 23 watts an hour, using about 552 watts in 24 hours. In Eco mode, set to -20, it averaged about 18 watts an hour, using about 447 watts in 24 hours. In Eco mode, set to -10, it averaged about 10 watts an hour, using about 240 watts in 24 hours. In Eco mode, set to -5, it averaged about 6 watts an hour, using about 144 watts in 24 hours. Eco mode seems to use less watts while running, but running for longer. Max mode averaged about 51 watts when the compressor was running, while Eco averaged about 42. Using an IR thermometer, the tub wall near the compressor matched the displayed temperature pretty closely, so I'm guessing that's where the sensor is. When set to -20, a thermometer at the bottom near the tub wall typically shows 4-10 degrees higher. Up in the lid would read about 5-14 degrees higher than displayed. The temperatures really depended on what was in it. If it was packed pretty tight, the readings where lower than if the unit had a lot of empty space, which seems typical of freezers/refrigerators. Battery Protection settings. The manual mentions battery protection and that the H3 setting is the default and safest, but doesn't actually give any numbers, so I thought I'd test it and find out. Battery protection stops the compressor and gives a F1 on the display if the voltage drops too low. My testing was done using it as a 12 volt system. Behavior seems the same for both Max and Eco modes. H3 will give the F1 between 11.6 - 11.8 volts, and will clear the error and resume around 12.5 - 12.7. H1 will give the F1 between 10.6 - 10.8 volts, and will clear the error and resume around 11.5 - 11.7. It would give the F1 as soon as the voltage hit the above values, but there was a delay of a few seconds up to about 30 before it would resume. You would think H2 would be somewhere in between H1 and H3, but it wasn't. Sometimes it would behave the same as H3, and other times as H1. At first I thought it would follow whatever was the last setting, but I think it's just random. Not sure if it's a design issue or just the one I have. Not that big of a deal for me now that I know, but if you assume H2 will protect your battery better than H1, it may or may not. I also got some strange behavior when switching between the modes, especially when the voltage was low. I would recommend if you change the setting, power it off, then back on, just to be sure. The above tests where done with a variable voltage DC power supply. Even though I'd prefer a 20L tub, rather than 15 with a 5L lid, all in all, I like the C20 for the money. I was considering giving it four stars for the lid and strange H2 setting, but anyone looking at the picture before buying should know about the space in the lid, and the H2 itself isn't enough for a full star. If I could, I'd give it a 4.8 or 4.9.