About the Refrigeration System : The sea water flake ice machine uses a refrigeration system to cool the evaporator. Common refrigerants are environmental friendly gas, R404a, or R507a. or others depending on the design and intended use of the machine. Small Industrial Ice Machine, Crystal Clear Ice Maker, Ice Dispenser Business, Ice Maker Cad Block,Large Ice Cube Makers. Food Preservation Tube ice is used to preserve seafood, meats, and other perishable items. The product will supply to all over the world, such as Europe, America, Australia,Birmingham, Greek,Hongkong, Moscow.3.Battery: there are mainly two types of battery in the solar system. One is cheap one, lead batteries, this one is cheap but can’t last long, another is lithium battery, this one is expensive but it works quite well.