We install a 1 megawatt hour energy storage system , with an initial investment of about 1.5 million, and see how many years we can recover the cost? The
energy storage system is like a super-capacity power bank, which will connect to the grid to charge when the electricity price is the lowest late at night, and then release the electricity for you to use during the day when the electricity price is the highest.
Taking the electricity price in the Pearl River Delta region of Guangdong as an example, the price of valley electricity in the middle of the night is about 0.29 yuan, while the price of peak electricity in the daytime may even be as high as 1.22 yuan.
The first peak price is about 1.51 yuan, and the cut-off price is 0.73 yuan. In the case of the largest difference between peak and valley electricity prices, you can save about 1.2 yuan per kilowatt hour.
Taking into account factors such as equipment wear and tear, operation and maintenance, and insurance costs, even if the real electricity savings are around 0.85 yuan per kilowatt hour, charging and discharging twice a day
can bring you 1,700 yuan of electricity. One month is 44,000 yuan, one year is 528,000 yuan, and the cost of energy storage system can be recovered in three years.