> I remember back in the training days, our teacher just held a metal pane, painted black, into the sun for a demonstration. And got to 80ºC in a few minutes. I

> I remember back in the training days, our teacher just held a metal pane, painted black, into the sun for a demonstration. And got to 80ºC in a few minutes. In January. A bit off topic and slightly different tech, but I have a solar kettle which uses reflected sunlight and boils a liter of water in a bit over an hour. The sun has energy to spare, and I always like learning new was to utilize it.