A few weeks back I mentioned on another thread that I ordered a Fridge Optimizer unit for my NovaKool to improve its performance and a few people asked me to post my observations.
Well it was a very easy installation except running the one small cable into the interior of the fridge. I ran the cable with the other wires so had to remove the sealant around the existing wires. That was the hard part. I used butyl sealant to seal the new holes I made.
This product claims to keep the fridge defrosted and that seems to work well as I never see ice buildup on the cold plate at the top of the fridge. Better performance is hard for me to attest to as we've only used the fridge for a few weekends but I came across a review of the Fridge Optimizer that goes into great detail that you may be interested in.
Here are a few more links that may be of interest:
SLFO-ACDC-122401 Fridge Optimizer - Programmable Thermostatic Control & Monitor AC/DC
Fridge Optimizer | Stainless Lobster | Creative Marine Products
One caution I would suggest is that you look at your compressor and note the model number before ordering to be sure the Fridge Optimizer is compatible. In my case, I have a AC/DC fridge but because my NovaKool was manufactured (12/03) before a AC/DC compressor was available I initially ordered the wrong model - a AC/DC rather than a DC only model.