A. Hunter Fanney
Senior Research Scientist, Energy and Environment Division
National Institute of Standards and Technology
The chart above gives the energy consumed (blue bar) and the energy generated (red bar) by the NZERTF on the monthly basis. When the height of the red bar exceeds the height of the blue bar, the house produced more energy than it consumed and the difference was exported to the electric grid. If the height of the blue bar exceeds the red bar, the house consumed more energy than it generated and the difference was imported from the electric grid. The green triangles represent the monthly total solar irradiance incident on the NZERTF's photovoltaic array.