energy storage is one kilowatt-hour of electricity, and one megawatt-hour is one thousand kilowatt-hours of electricity. The core of the energy storage system is the energy storage battery . Common energy storage battery cycles are about 8000 times, and the energy storage system battery decays by about 2% per year, generally to about 80% after 10 years. In terms of
cost composition, the cost of energy storage system is mainly composed of battery cost, BMS cost, EMS cost, power conversion system (PCS) cost, installation and commissioning cost.
Among them, the battery cost accounts for the highest proportion, which can reach 60% -70% of the total cost. At present, the EPC quotation in the market is about 1.1 yuan per watt. The kilowatt or megawatt of
photovoltaic is power, which means the amount of electricity generated, and the kilowatt-hour or megawatt-hour of energy storage is capacity, which means the amount of electricity that can be stored per hour. If a
1 MWh energy storage cabinet is charged with a power of 1 MW, it can be fully charged with 1000 kWh in one hour; if it is discharged with a power output of 500 kW, it can be exhausted in two hours.
However, in practical applications, the charging and discharging time can be flexibly adjusted to 3-10 hours, but if it can not achieve two charges and two discharges per day, the economic benefits will be greatly reduced.
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