“This is a solar-powered website, which means it sometimes goes offline”

This website runs on a solar powered server located in Barcelona, and will go off-line during longer periods of cloudy weather. However, this limied energy storage became problematic as the days got shorter. This set-up would keep the website online during one or two days of bad weather, after which it will go off-line.

Source: solar.lowtechmagazine.com