The overall cost of a small-scale solar photovoltaic power generation system for offices is about 10,000 yuan per kilowatt. You consume 8 kilowatt hours (kWh) of electricity per hour and theoretically need around 10 kilowatts of photovoltaic power generation facilities (due to efficiency issues). It will cost around 100,000 yuan.
But the real situation is much more complicated than that. You need continuous power supply 24 hours a day, and even large-scale professional solar photovoltaic power plants in China can only produce electricity for about 2,000 hours a year. . That is to say, on average, it can only efficiently produce electricity for about 5.4 hours per day, which can only cover about one-fifth of the electricity you need on 24 hours. In other words, 10 kilowatt power generation equipment is sufficientt. far from meeting your needs. Based on this calculation, you need to purchase and install 50 kilowatts of photovoltaic power generation facilities, as well as a battery sufficient to store 40 kilowatts of electricity for 19 hours. Otherwise, electricity cannot be supplied at night and other times when there is no sunlight.
The cost is at least 600,000 yuan. The battery also takes up one of your rooms.
Regarding the payback period, if it is calculated based on the electricity price of 0.93 yuan and based on static calculation, it will take about 10 years. If calculated dynamically, that is, taking into account the time value of your one-time investment of 600,000 yuan (similar to interest of at least 6%), the cost recovery time will be extended by approximately 3 years, up to approximately 13 years. .
In addition, if it rains or snows for several days in a row, theSolar power generation system will hardly be able to produce electricity, and you will also have to use energy from the large power grid intermittently. .
In addition, the electricity generation capacity of photovoltaic solar panels will continue to decline. After 5 years it would be good to maintain 90%. This factor will cause your power supply capacity to decrease. Additionally, battery life is very limited (unless you purchase expensive imported batteries) and the battery needs to be replaced approximately every 3 years, further extending your cost recovery period.
Let’s analyze it. Although it is environmentally friendly and appears to be high-tech, the reliability of solar energy supply is really unflattering and the payback period is too long. A complete analysis makes it unprofitable.