Here is a link to a couple of items that I installed that have helped reduce power
http://www.sportsmobileforum.com/for...des-22480.html
The key device for power savings would be the
Merlin 11, mini smart controller
Of course you bigger problem is temperature around the compressor, with some of our builds airflow around the compressor is hard to come by. When the top is down it can be very difficult to keep the temperature down. A fan helps but it becomes a trade off on fan power versus refrigerator power. I use this
temperature controlled relay to control the refrigerator vent, and also have one for a 12 volt fan .
I would like to think it all helps, if it gets hot there is only so much I can do, I have thought of looking at external venting.
From your power perspective, your 120 watt panel won't keep up with it in these conditions. Also I suspect your panel is pretty old, if you were going to increase solar size it would be better to start with newer panels.
You also need to come up with a battery management program.
-greg