Abstract
Generally the prediction value of the amount of annual power generation of the actually installed photovoltaic generation system is calculated as follows:
Multiply the rated capacity (kW) and the monthly fixed coefficient (Summer: 0.8, Winter: 0.9, Spring/Autumn: 0.85, etc.) by the monthly solar isolation on the receiving surface. Calculate the annual total of these values, and acquire the annual amount of power generation regarding the losses of the system. However, these temperature coefficients are rough values, so the prediction value of the amount of annual power generation cannot be so accurate.
Here, we propose the method to calculate “Monthly temperature coefficient" for each photovoltaic generation system as accurately as possible using the simulation calculation. It is shown that thus calculated “Monthly temperature coefficient" is quite corresponding to “Monthly temperature coefficient" calculated using the actually measured values of the 40kW class photovoltaic generation system. We examined the influence on “Monthly temperature coefficient" caused by differences of regions, photovoltaic module characteristic values, and photovoltaic module frames using the simulation calculation.
