With the full support for the energy storage industry, photovoltaic and other new energy projects require the condition of equipping energy storage systems, usually between 5% and 30%. Would you calculate the cost of photovoltaic plus energy storage projects? For example, a 100 MW photovoltaic power plant needs to be equipped with 20% energy storage to generate electricity. The required battery capacity is 20 MWH, and a 10 MW or 20 MW energy storage power plant needs to be configured based on the highest applicability of 2 hours as the energy storage equipment. The 10 MW refers to the power of the energy storage battery. What about the installation cost? It is equal to the installation capacity of the photovoltaic power plant multiplied by the unit price of the photovoltaic part, plus the battery capacity multiplied by the unit price of the energy storage part. Note that photovoltaic and energy storage belong to two separate systems, so do not mix them together when calculating costs and unit prices, otherwise the results will be inaccurate. This is how the cost of photovoltaic plus energy storage projects is calculated.