Due to the energy needed for the people has the very strong timeliness and spatiality, in order to reasonable use of energy and improve the utilization of energy, you need to use a device, to collect and store excess energy that is temporarily unused for a period of time, extract and use during peak usage, or transport to the energy shortage areas and use again, this approach is the energy storage system.
Solar energy storage is one of the energy storage system. Solar energy storage first converts the sun’s energy into electricity through solar panels and then stores energy through battery storage system. It is self-consumption, without energy storage, solar energy system would not be able to generate electricity without sunlight, but If there is energy storage, the excess power will be stored in the battery to power the load at night.
The basic task of an energy storage system is to overcome temporal or local differences between energy supply and demand. There are two reasons for this difference. One is caused by sudden changes in energy demand, that is, there is a peak load problem, and the energy storage method can play a role of adjustment or buffer when the load change rate increases. Since the cost of an energy storage system is relatively lower than the cost of building a peap-load plant, the energy storage system can reduce fuel costs because the energy stored is either excess or new energy from the plant, although there are storage losses. The other is caused by primary energy sources and energy conversion devices, etc., and the task of the storage system is to equalize energy production, that is, not only to reduce the peak of energy output, but also to fill the trough of output.
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