Energy yield: Introduction and factors affecting it
9th March 2018
To ensure that the business runs smoothly, it is necessary that the business model (and hence the cash flow) is correctly designed and implemented. An important indicator of successful business is the Return of Investment (RoI) of its assets (Figure 1). For a solar power plant where more than half of its investment cost is dependent on solar module, it is important that they (solar module) perform to their maximum. The performance of solar module can be gauged by the amount of energy (Wh) it produces over a specific period of time. However, due to different solar module design and efficiencies, it is easier to evaluate the performance (and hence their capability) of various solar modules by determining its specific energy yield (kWh/kWp) (i.e. by dividing the absolute yield (kWh) to its power output PSTC (kWp)). This specific yield while thought to be constant is dependent on few factors which dictate the output of solar panel (and hence it'sRoI). This article hence aims to explain such factors and their effects to its readers.
Figure 1: Cash flow for a sample solar power plant
There are few controllable and uncontrollable factors that affect the specific yield in a fixed and/or variable amount. They are explained as below:
Figure 2: Effect of irradiation on power output of solar module (Source: Waaree Energies)
Figure 3: Definition of Air Mass (Source: PV Education)
Figure 4: Effect of temperature on power output of solar module (Source: Waaree energies)
Figure 5: Thermal coefficient of a typical solar module (Source: Waaree energies)
Waaree energies provide a detailed datasheet of its module on its website to help its customer consider all the parameters affecting the energy yield of their plant and get the best out of it. Such updated datasheets would enhance customer's understanding about all the parameters associated with our solar modules.
Let us all pledge to make solar energy the primary source of energy in the near future.
RAHE ROSHAN HAMARA NATION