This was just pointed out to me: Using LightUp for SketchUp you can perform an insolation analysis to assess the distribution and availability of solar radiation over an entire building or even a city block.
It can provide realtime navigation of Insolation results with a realtime spot meter showing kwh/m^2/day as well as static and tracked daily results for photovoltaic designs. See the embedded video for more or go to

“Using LightUp to calculate geo-located, seasonal Insolation maps for an entire city model with realtime navigation and realtime readings off surfaces. Shows how significant thermal effects are on buildings in Winter and Summer.”