Right, 'what he (sailingdog) said'!
My son and I both have Engel MT 35 units. Both have been running 3 years straight only down 1 hour per year to defrost. We use them in our homes when not sailing. He took his to the Bahamas and back to Charleston, SC in all kinds of weather and seas up to 15 feet no problems. He had an amp meter on his and said it never reached 2.5 set on freezer..told me to use 2.0 as a working number.
We're taking ours on a 2 month trip to Chesapeake from SC and back. Leaving in 8 days, we'll report on performance. We keep 2 2lt bottles freezing and 2 more in the ice box in the galley. Each morning we switch them so we always have 'block ice' in the galley box. We take ours on long car trips and it will run 12 hours over night and I still have juice to start the car. We both have the insulating jacket...recommend it highly..better cooling and protects the box.