I believe Engel use a Tecumseh compressor. We found the Engel seemed to run down our batteries noticeably more quickly than our home-made Danfoss-based freezer, and didn't perform as well either. As you say, it's all down to insulation (including positioning), venting, usage (keep it full, and closed!), and ambient temp.
Originally Posted by whatcharterboat
I think the question of what other accessories are being used, and what was being used last time you ran the engine etc., is something of a red herring. Of course, if you have loads of lights and other stuff running at the same time, it will run your battery down more quickly, but to be useful, you have to factor those out of the equation to understand what you might be able to achieve with the fridge/freezer alone.
Michael & Sandy Groves
"We're all going to die, it's the living that counts."