Solar

City Monitors for Varying Solar PV Efficiency

September 3, 2004 [SolarAccess.com] In order to help San Francisco residents understand solar energy as well as encourage solar power installation in the city, the city’s Public Utilities Commission has developed a network of eleven solar monitoring sites (representing eleven supervisor districts of the City’s Board of Supervisors at the time of installation). Each site monitors global horizontal irradiance (GHI), air temperature, and windspeed at five-minute intervals. GHI measures the amount of sunlight that hits a square meter area. This data can then be used to estimate how much energy a rooftop photovoltaic solar panel system can produce and how much money consumers might save if they choose to install such a system.