Eutectic systems: Eutectic systems consist of hollow tubes, beams or plates filled with an eutectic solution (phase change material) to store energy and produce a cooling effect whenever necessary to maintain the correct temperature in the refrigerated container. The Eutectic concept is different to conventional refrigeration systems in that a cold source (heat absorption) is provided by phase change material rather than direct expansion of refrigerant gas. The plates or beams that contain the eutectic are charged (frozen down) at night on mains power. Once the beams are frozen they operate silently and provide reliable, rapid cooling for a specific duration of time.