I think the consumption
is a bit high. Prob due to the very high ambient temp. As suggested, I would consider the fan. A good Noctua computer fan draws only 0.09 amps or less. That's the rate of my 14cm Noctua fan. And they are so quiet youll think its inoperative.
I recently bought a 150l household 240v fridge freezer. 80w consumption
specified. I tested it with a watt reader, similar as kill-a-watt ones. After filled to about half full it draws about 90 to 100 ams per 24 hour period. After its cooled down all the foods and drinks and I don't open the door, thermostat at about 3/4 setting, it draws 50 amps per 24 hours. (amps after conversion to 12v, no inverter
, from 240v shore power
). I keep ice substitute in the freezer, seems to help. But its well ventilated at the moment as I haven't installed it yet, its just sitting on the floor. And my air con keeps the ambient temps at about 23 to 25C (73 to 77F).
So, comparing my 200 usd Sanyo house fridge to your 1000 usd marine
fridge, I seem to draw less, but my volume is about 50 % more. Also my ambient temps are cool and air conned. I haven't tested it without air con yet.
But I would say yes, I think you draw a bit much. Is the insulation
pretty much same as on a basic house fridge?