Reasons for the lack of power in the pv system when it is cold in winter
When the weather is cold in winter, the power generation of the pv system is indeed affected. The main reasons for the lack of power are as follows:
1.The working temperature of solar modules decreases, resulting in a decrease in power generation efficiency.Especially when the temperature of the PWM controller is low, the power generation efficiency decreases significantly;
2. In winter, the radiation intensity becomes weaker and the duration of sunshine becomes shorter, so the power generation will be less than in summer;
3. When the battery is low temperature, the internal activity of the battery will decrease, and the capacity will decrease, resulting in a decrease in the storage capacity.
4.The voltage of the same battery at different temperatures is not the same. The standard temperature of the battery is 25°C. When the temperature is lower than the standard temperature, the voltage of the battery will rise. When the battery voltage rises, the corresponding charging voltage also needs to be raised. Under normal circumstances, the equalizing voltage of the battery is set to 14.4 V.When the temperature drops 1°C from 25°C, we need to raise the charging voltage by 18mv.If it is -10°C, we need to raise the charging voltage to 14.94V, only in this way can the battery be fully charged Charge. However, many pv controllers on the market do not have the temperature compensation function, so when the temperature drops, the battery is not fully charged for a long time, and the power shortage will naturally occur.
Therefore, when the temperature drops in winter, in the pv power generation system, if there is city power on site, it can be appropriately switched to the city power bypass; if the city power conditions are not available, we must consider reducing unnecessary loads!If the pv controller does not have the temperature compensation function, at low temperature, the capacity of the battery will decrease. If it is still in a state that cannot be fully charged for a long time, it will have a certain adverse effect on the service life of the battery and the use of the whole pv system.In this case, you must choose to replace the pv controller with temperature compensation function to charge the battery.
Through the above introduction, everyone has a certain understanding of the causes and solutions of power shortage in cold weather, and you can also contact us for more professional guidance!