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The radiation values are taken from the European Solar Radiation Atlas, Springer Verlag 1996. The module values are given in the German specialists book Understanding Renewable Energy Systems.

The installable electrical power is calculated as follows:

*P* = *A*_{roof} *f*_{use} * *f*_{occ} * *eta*

The electrical ouput is given by:

*E*_{PV} = *H*_{hor} * *A*_{roof} *f*_{use} * *f*_{occ} * (100 % + *f*_{slope}) * *eta* * *PR*

The specific annual output is calculated:

*Y*_{F} = *E*_{PV} / *P*

The total costs are:

*k*_{tot} = *P* * *k*_{rel} * 1/kW

The levelized electricity cost without maintenance costs are calculated as follows:

*k*_{E} = *k*_{tot} * *p* / (1 - (1 + *p*)^-*n*) / *E*_{PV}

**Attention:** This performance analysis is only a rough estimation that can not replace a detailed planning and analysis. No responsibility is accepted for the correctness of this information.