Patent ID: 8146585

Claim:
A portable, self-contained, passive solar system, comprising an insulated shell including a top panel, a bottom panel, a front panel, a first side panel, a second side panel, a third side panel, and an inclined panel having a window with a window area when the insulated shell is positioned in a first operating position, and the top panel becoming a first side of the insulated shell, the front panel becoming a top of the insulated shell, the bottom panel becoming a second side of the insulated shell, and the third side panel becoming a bottom of the insulated shell when the insulated shell is positioned in a second operating position, the insulated shell including an exterior surface and an interior surface, the top panel, the bottom panel, the front panel, the first side panel, the second side panel, the third side panel, and the inclined panel forming an interior having a volume for holding an item, the window permitting sun light to enter the insulated shell and heat the item while the interior surface and the top panel in the first operating position and the front panel in the second operating position cause the sun light to be reflected and trapped within the interior, wherein a ratio between an area of the front panel and an area of the inclined panel is between 1:1.2 and 1:2.8, and wherein a ratio between the volume to the window area is between approximately 4.5:1 and approximately 20:1.