Class A,

(1) the system outputs more power;  (2) the user's electricity consumption in a day, the power of the electrical equipment and the service time of the electrical equipment;  (3) Local weather and climate conditions of users (countries and regions).

Class B,

(1) the duration of use of all user's electrical equipment and all electrical equipment;  (2) Local weather and climate conditions of users.

Note: The system is generally designed to generate electricity in sufficient sunlight for one day, not in rainy days, so the system will only be able to withstand the use of power equipment for one day, and customers have other requirements to consider separately.