The cooker is well insulated, so it stays hot.
By using a concave mirror reflector.
A parabolic is an improved box cooker.
parabolic cooker.
A parabola solar cooker works the best and fastest
A solar cooker and a pressure cooker are two completely different ways of cooking. A pressure cooker can still use a heat source like a gas or electric cook top. A solar cooker is as the mercy of the heat of the sun and the contents will only cook as well as the amount of heat it obtains.
A panel cooker is a way of using solar power to cook an item. The advantage of using a panel cooker is that it is using solar energy and not electricity.
horace de saussure invented the first solar cooker bout the year 1797
Functions of a solar heater
Solar is a device which Run from sunlight
because he did not have stoves back then so he made a solar cooker to heat his food up
john bohmer
Depending on the type of solar oven/cooker, it can be chilly outside, but if there is direct sunlight and especially a high UV index, the cooker can get very hot.
You can use a solar box and compare.