Performance Calculation for Grid-connected Photovoltaic Systems

Please enter here your data or choose parameters of the following lists.

list of locations

location name

horizontal irradiance H_hor

kWh/(m² a)

roof surface A_roof

m²

usable ratio f_use

occupancy f_occ

(e.g. 35 % at flat roofs)

gain/loss of slope f_slope

module list

module efficiency eta

system quality

optimal system, unshaded (PR=0.8)

good system, unshaded (PR=0.75)

good system, some shading (PR=0.7)

average system, more often shaded (PR=0.6)

bad system, often shaded (PR=0.5)

own definition

Performance Ratio PR

specific costs k_rel

US$/kWp

lifetime n

years

interest rate p

Annotations for the performance calculations:

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.

Fast selection

Social Media

Go to top