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# Photovoltaics - Calculate Modules per Area

Calculator for the maximum number of photovoltaic modules, which can be installed on a surface of a certain size. Enter the size of a rectangular surface, which should be covered with photovoltaic modules (possibly you have to consider a margin), and the size of a module. If the surface has a different shape or has gaps (e.g. roof-lights), then you have to split it into single rectangles, which can be calculated individually. For the surface and the modules, please enter values with the length larger than the width. It will be calculated, how many modules orientated along and how many across fit on the surface, as well as the size of the spare area.

Values of the rectangular surface and of one module
Surface length:
Surface width:
Module length:
Module width:
Distance between two modules:

Orientation along
Number of modules in length:
Number of modules in width:
Number of modules altogether:
Spare length:
Spare width:

Orientation across
Number of modules in length:
Number of modules in width:
Number of modules altogether:
Spare length:
Spare width:

At the orientation along, the long sides of the modules are parallel to the long side of the surface, at the orientation across, they are perpendicular. Sometimes the one orientation is more effective, sometimes the other. More common is the orientation across. In the following example, along has 9 modules, across has 10.

 Photovoltaic modules orientated along Photovoltaic modules orientated across

The spare area has an L-shape.

This calculator is for the estimation of the possible number of photovoltaic modules on a certain surface. The exact number and construction have to be planned by specialists. In addition to using the available space as much as possible, there are many other reasons for installing the modules in one way or another. A distance to the edge of the roof or to the neighboring roof may have to be maintained. Aesthetics and coherence with the optical conditions is something that of course cannot be calculated. A possible shadow cast can also play a role; the modules should be placed in such a way that the shadow tends to fall on the unused area. The occurrence of roof avalanches may sometimes be taken into account, especially in snowy regions and when a path runs under the edge of the roof.

Here you can convert area units.

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