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The grommet panel must be a minimum of 70 inches wide, between the side hem seams, to provide just slightly more than 1.5 times fullness on the 40-inch space.
A typical polycrystalline or monocrystalline panel measures about 1.6m x 1m, and depending on the capacity (size in watts) of your system, for an average 2 or 3-bedroom home, you should be able to fit enough panels to significantly offset your electricity costs on one, or in a stretch, two parts of your roof.he orientation of your roof is the first thing to consider when considering whether you want to install a system. In the southern hemisphere, due north is the best option, but obviously, not all homes were designed with solar power in mind, and as a result, roof orientations differ drastically from home to home.