The simple four pound (1.8kg) module is placed inside the GoSun Grill to preheat for a couple hours before cooking. Using the latent-heat capacity of our proprietary PCM (short for Phase Change Material) encapsulated within an aluminum extrusion, the Thermal Battery is able to store much more energy than a material with only sensible heat (such as concrete or sand). Through the process of melting the PCM at roughly 310°F or 155°C, the Sun’s energy is stored for use later in the day. Capable of reaching temperatures over 400°F or 205°C, this heat is fully insulated while left inside the evacuated tube chamber.
When the Cooking Pans are placed on top of the Thermal Battery, the reverse of the melting cycle begins where the PCM begins to transfer its stored heat into the cool, uncooked food. Conduction between the hot Thermal Battery and the food is very strong since they are virtually in contact with one another, separated by two layers of metal. The food cooks quickly as heat rises from the Battery and the PCM slowly cools (actually changes phases, aka freezes) back to its solid state.