Rule Of Thumb Pv Size For Flat Roof

It would be equivalent to laying solar panels flat at the equator.

Rule of thumb pv size for flat roof.

A general rule of thumb around 6000 8000m2of sloping roof space is required per megawatt of capacity installed mwp. 6 24 2014 david howard aia said. A good rule of thumb for local shading is don t place modules anywhere that is closer then 3x the height of the obstacle from the object. Here you can see that the rule of thumb is less accurate.

The effect of an array s tilt angle on solar pv energy output may be up to 20 compared to that of flat installations. A peer review journal published by the university of queensland in 2013 found. What is the general area of a flat 1 4 1 0 slope single ply roof for each roof drain ratio for the number of roof drains roof area. The theoretical optimum configuration is approximately 26 degrees north for tilt angles with pv panels facing true north for orientation.

Again the green line represents the rule of thumb orientation. But it turns this rule of thumb is not entirely correct. A flat rooftop will accommodate less capacity as spacing must be left in between each row of panels to avoid self shading. As a general rule of thumb energy output can be optimized by adding 15 degrees to a site s latitude in the winter and subtracting 15 degrees to a site s.

A comparison of data in two us cities has been completed to exhibit the importance of a solar pv array s tilt angle. On flat roofs panels are fitted on mounting systems usually at a slope of around 15 degrees. You can still place module south of the local shading areas. The ideal angle of inclination in seattle is about 35.

If a stink pipe is 12 inches don t place any module north east or west of it closer then 36 inches away. Is there a rule of thumb for number of roof drains needed on flat roofs.