With the possible use of lithium ion batteries/solar panels to harvest heat for energy, there is of course a risk that the product could spark fire.Â
The necessary steps will be taken to adhere to the IEEE Engineer's code of ethics ( IEEE - IEEE Code of Ethics ), through rigorous testing of different parts of the product.
In real-world application, the product would be put in an area with a nearby fire-hydrant (more populated areas), before clearing for personal use.
In use though, it would be best environmentally and hazard-wise to have the product be powered by solar panels.