Calculation of Annual Grid-Connected Electricity Generation for Distributed Photovoltaic Power in Industry and Commerce

Annual Online Electricity Calculation

Solar Photovoltaic Power Generation System Efficiency Analysis

1) Photovoltaic Temperature Factor

The efficiency of photovoltaic cells changes with their operating temperature. As their temperature increases, the efficiency of most types of photovoltaic cells tends to decrease. The reduction factor is set at 96%.

2) Dust Loss of Photovoltaic Array

Due to contamination from dust or water accumulation on photovoltaic modules, statistics show that frequently rain-washed modules are affected by an average of 2-4%, while dirtier modules without rain washing are affected by an average of 8-10%. The project location experiences windy springs and rainy summers, so a comprehensive reduction coefficient of 3% is considered, meaning the pollution reduction factor is 95%.

3) Average Efficiency of Inverters

The current average efficiency of grid-connected photovoltaic inverters is about 97.5%.

4) DC Power Distribution Loss of Photovoltaic Array

Preliminary estimates indicate that the DC power distribution loss of the photovoltaic array is about 1.5%. The comprehensive power distribution loss coefficient is 98.5%.

5) Unit Availability

Although the failure rate of solar cells is extremely low, regular maintenance and grid faults still cause certain losses. The loss coefficient is set at 1%, and the availability of the photovoltaic power generation system is 99%.

6) Energy losses such as internal power consumption, step-up transformer loss, and line loss in the photovoltaic power plant account for 2%, with a utilization rate of 98%.

7) Solar panel variability loss is 2%, with a utilization rate of 98%.

8) Unusable radiation loss in the morning and evening is 2%, with a utilization rate of 98%.

Combining the above reduction coefficients, the comprehensive efficiency of the fixed polycrystalline silicon battery array system is 81.6%.

The photoelectric conversion efficiency of crystalline silicon photovoltaic modules decays year by year. Over the 25-year lifespan of the entire photovoltaic power generation system, the average annual effective utilization hours also decrease annually. The photovoltaic modules used in this project have an annual decay of no more than 10% within 10 years and no more than 20% within 25 years.

Jiangsu Mangzhong Construction Co., Ltd. is a comprehensive energy service provider focused on the photovoltaic field, dedicated to being a smart energy enterprise involved in photovoltaic power plant investment, development, design, construction, intelligent operation and maintenance, professional consulting services, and photovoltaic power plant equipment recycling.

Company Name: Jiangsu Mangzhong Construction Co., Ltd.

Business Scope: Photovoltaic power plant EPC and photovoltaic solar power plant investment

Company Landline: 025-5888 3737   

Mobile Number: 159 5163 4545

Company Website: http://www.mangz.cn