[Peace of Mine]

Most refrigeration systems require a condensing unit that throws off the heat. The keel-kooled unit is installed underneath the boat so that the heat disipates in the water. The colder the water, the more efficient the unit. Normal boat refrigeration systems have two pumps. One cools the unit by pumping water into the boat. One pumps refrigerant through the system. Two pumps take a lot of power.

With a keel-kooled unit, the compressor is the only pump. It pumps refrigerant through the keel-kooler, keeping the heat outside, thus increasing efficiency AND no need for water inside the boat. Much safer, no leaks, no sinking the boat.

We built a chest-type refrigerator, highly insulated, or you could choose a large unit sold through Boater's World that holds ice for up to a week. You mount the Fridg-O-Boat unit inside the box. Again, a DIY project. J can work on it and troubleshoot, a major benefit. This is, of course, a 12V set-up. It could be used with 24 V.

If you had running water, or a pond, nearby, you could use this technology on land. We put the unit in a bucket of water with a small amount of fresh water going in before we could install it underneath. Worked fine. It provides excellent refrigeration for very little power.

We have seen units that utilize the earth in a similar way. (Installed underground where the temperature remains at a constant cooler temperature)

DON'T FORGET LED LIGHTS! This is space-ship technology that continues to improve. Takes so little power, it hardly registers on the e-meter.