Delta-T’s SPN1 Pyranometer is being used to monitor The China Three Gorges Corporation's new 100MW solar farm in Hebei Province, China, 2.30km southwest of Beijing. The solar farm is being built on more than 40 square kilometres of hilly, uncultivated land.

The SPN1 is a meteorological class instrument designed for long-term outdoor exposure, and is an affordable and effective alternative to traditional shade-ring pyranometers, sun tracking pyrheliometers, and other sunshine recorders. It measures global (total) and diffuse radiation, and sunshine state all in one instrument. It is easy to use, has no moving parts, and needs no routine adjustment or polar alignment.