The difference between photovoltaic inverters and energy storage inverters

So, what is the difference between photovoltaic inverters and energy storage inverters? We can compare from the following aspects: the control strategy of photovoltaic inverters is mainly a unidirectional strategy that converts the output DC power of photovoltaic modules into AC power. Its operation period is mainly during the daytime, and the power generation is affected by weather, which has instability and other issues. In addition, in photovoltaic systems with anti backflow function, inverters can flexibly adjust their output power (MPPT) according to the system's power generation situation to achieve energy control. The power control of energy storage inverters is relatively complex, requiring the bidirectional conversion of DC and AC electricity. They can not only transmit power to the grid like photovoltaic inverters, but also obtain power from the grid; At the same time, its operating period is relatively limited, and when the load is low, it stores electrical energy in the battery; When the load is peak, the stored electrical energy will be released to reduce the pressure on the power grid; When the power grid fails, it can also switch to off grid mode to continue power supply, achieving stable control of energy.

 

Application scenarios: Photovoltaic inverters are commonly used in photovoltaic systems such as balconies, households, and industrial and commercial areas. Their main function is to convert photovoltaic direct current to alternating current and deliver it to the power consumption area. In addition, large-scale photovoltaic power plants such as ground and centralized ones also require the use of photovoltaic inverters to convert the generated DC electricity into AC electricity. Energy storage inverters are commonly used between energy storage systems and power grids, such as in industrial and commercial energy storage stations, household photovoltaic storage, and other scenarios. Energy storage inverters can utilize energy storage devices such as batteries to store and use energy through charge and discharge management, meeting the electricity demand at different times in various scenarios and ensuring stable and reliable power supply.
Technical requirements for photovoltaic inverters generally focus on factors such as DC/AC conversion efficiency, power density, protection function, and protection level; Energy storage inverters focus more on factors such as charging and discharging efficiency, parallel/off grid switching speed, and energy storage density.