It's not safe, it causes light pollution and takes up space. Boiled water is not toxic. The time it takes to boil a kettle depends on the size of the panel, intensity of light, season, size of the kettle, etc. Generally, it can boil in half an hour. The price is not expensive, you should be able to get it for 2 or 3 hundred yuan. If you're just boiling water, why not use a solar water heater? Specialized in boiling water, it's much better than this big pot
Solar water boiler
Introduction Solar water boilers are dangerous, cause light pollution and take up space. The water they boil is not toxic. The time it takes to boil a kettle depends on the size of the panel, the intensity of the light, the season and the size of the kettle.