solar for the fridge in your van · 21-08 00:25
A van in the sun is warmer inside than the weather station says, and the fridge stands in the warm bit. This is the one number the tool cannot know for you.
Nothing here is off a sticker. The cold box is taken as a cube of the volume you gave it, the walls as polyurethane at 0.024 W/m·K, and the heat that leaks in is turned back into watt·hours through the COP of the machine you picked. Then the two factors that clean foam knows nothing about: what the box really is — a tub with a lid is close to the sum, an upright fridge with a door seal, a steel frame and a compressor bay cut into its side is two and a half times it — and how often you stand in front of it. Those two are fitted to the 24-hour figures the makers publish at 25 °C, and they are buttons rather than constants for exactly that reason. It lands within a fifth of a measured fridge, which is closer than the sticker.