Rule Of Thumb Pv Size For Flat Roof

How to calculate the drainage requirements for flat roofs reader question.

Rule of thumb pv size for flat roof.

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. It would be equivalent to laying solar panels flat at the equator. If a stink pipe is 12 inches don t place any module north east or west of it closer then 36 inches away.

A general rule of thumb around 6000 8000m2of sloping roof space is required per megawatt of capacity installed mwp. A flat rooftop will accommodate less capacity as spacing must be left in between each row of panels to avoid self shading. 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. Is there a rule of thumb for number of roof drains needed on flat roofs.

Here you can see that the rule of thumb is less accurate. A comparison of data in two us cities has been completed to exhibit the importance of a solar pv array s tilt angle. The ideal angle of inclination in seattle is about 35. Some building codes start at one quarter of an inch per foot or two percent.

The effect of an array s tilt angle on solar pv energy output may be up to 20 compared to that of flat installations. On flat roofs panels are fitted on mounting systems usually at a slope of around 15 degrees. Again the green line represents the rule of thumb orientation. The theoretical optimum configuration is approximately 26 degrees north for tilt angles with pv panels facing true north for orientation.

A panel mounted horizontally flush on a flat roof has an angle of 0 and a panel mounted vertically flush on a wall has an angle of 90. You can still place module south of the local shading areas.