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Trying to help my neighbor with his Grid-Tie rooftop solar installation in California. The 9.75 kW system consists of 26 panels split into five arrays. The distance between arrays varies between 5ft - 20 ft. The roof has many ridges, hips and valleys to contend with. The panels will be wired...

Hi, just want to say hello to everyone and really appreciate having a site to kick around solar projects and such. Would like to hear comments about using the PVWatts website for system sizing and Google Sunroof for panel placement. My neighbor wants to add a Grid-Tie solar system to his house...