If a low-cost lead-carbon battery is used for energy storage, the unit investment is 1200 yuan/kWh, the discharge depth is set to 70%, and the discharge efficiency is set to 0.94. To charge and discharge at 20 degrees, the battery capacity needs to be configured as:
12V 200Ah solar battery bank for house batteries are used in 4 strings and 3 and a total of 12 cells. The cost of the first battery investment is 36,480 yuan.
The discharge curve of the solar energy battery is as shown in the figure below (25°C). When the DOD is 70%, the number of cycles is about 4000. However, when the battery is lower than 0°C or higher than 40°C, its performance is greatly affected. Therefore, we estimate that the number of cycles is 3000, and it can be used for about 8 years.
The 10kw battery pack for house needs to be replaced 3 times during the 25-year service life cycle.
The 10kw battery bank for house recycling price is about 1.5 yuan/Ah, and the recycling income is about 200*1.5*4*3*2=7200 yuan
The total cost of the battery in 25 years is about 100,000 yuan
25 years electricity cost is about 0.5 yuan