There are a handful of these off grid solar inverter kettle devices
available, although fundamentally the more well-known designs are as follows:
The solar kettle-thermos flask is a solar energy system design, developed by
Alex Kee in 2006, that uses an evacuated solar glass tube (solar vacuum glass
tube) constructed from borosilicate glass to capture and store energy from the
sun. The tube consists of an inner glass layer characterized by a dark exterior
that heats up in sunlight, whereas the outer glass layer is transparent
allowing sunshine to penetrate. This sunshine transports the solar infra-red
energy and penetrates through this outer layer and subsequently through the
vacuum layer onto the inner layer where it is absorbed.
The air is evacuated between these two layers with a
consequent insulating vacuum. The vacuum effect is disproportionately powerful
due to minimal air or the absence of air. Without air molecules present (or
with very little air molecules present), heat cannot move around and remains
trapped, which ensures the environment gets hotter and retains the heat for
longer, in much the same way that a vacuum flask keeps liquids hotter for
longer periods of time.
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