Factors that need to be considered:
1. Where is the solar power generation system used? What is the situation of the solar radiation?
2, how much is the load power of the system?
3, how much is the output voltage of the system, DC or AC?
4, how many hours a day will the system need to work?
5, if there is no sunlight irradiation of the rainy weather, the system needs to be continuous power for many days?
6, load, pure resistive, capacitive or inductive, large starting current?
7, the number of system needs.