Life cycle cost of grid-connected photovoltaic power generation system = investment cost + operation and maintenance costs + financial costs, investment cost of grid-connected photovoltaic systems, including purchase costs of photovoltaic modules, storage batteries, inverters, power distribution cabinets, supports, cables, and other equipment and materials There are also construction and transportation and transportation costs; operation and maintenance costs include salary of the operating personnel, maintenance costs of electrical equipment such as inverters, cleaning fees of photovoltaic modules, etc. The operation period of photovoltaic systems is generally 20-25 years. Unlike the case where coal-fired fuel power generation requires the purchase, transportation, storage of energy, and disposal of residuals, the input energy of the photovoltaic system comes from the sun. During the operation period, the photovoltaic system does not require other energy sources, and almost no residue is generated. If the PV arrays are installed in a fixed manner, there are no vulnerable rotating components in the PV system, and the service life of major electrical equipment such as components is more than 20 years. The maintenance workload of the system is also small, and the annual maintenance cost accounts for the system cost. %about.
The benefits of photovoltaic systems are directly proportional to the amount of electricity generated, and the factors that determine the amount of electricity generated by photovoltaic systems include the rated capacity of photovoltaic modules, the on-site solar radiation, and the efficiency of photovoltaic systems. Photovoltaic module rated capacity is the peak value of PV module output power obtained under the standard test conditions. Since the on-site conditions are different from the standard test conditions, the actual output power of PV modules mainly depends on the amount of solar radiation on site. In addition, the photovoltaic system output power should also be included in the impact of various losses and aging derating.
Photovoltaic power generation is very affected by the weather, and it cannot generate electricity during rainy days. Therefore, the local weather should be taken into account when designing the system. For users who require electricity, consider the days of continuous rainy days.