There are four ways for inverter to charge the battery. If you choose mains power to charge the battery, you should notice that the efficiency will decrease, because the mains will charge the battery and then discharge it, there will be a certain amount of power loss. Generally, the charging and discharging efficiency of off-grid inverters is about 90%.
Inverter’s four battery charging
methods are as follows:
1)PV priority: PV gives priority to battery charging, only when there is no PV energy, the mains will charge the battery. This mode is suitable for users who have relatively expensive electricity prices and low power supply requirements.
2)Mains power priority: Mains power gives priority to the battery charging, only when there is no mains power, the photovoltaic will charge the battery.This mode is suitable for scenarios where the electricity is cheaper but there are frequent power outages.
3)Inverter charge the battery at the same time from the mains and PV. This mode is suitable for the area that electricity price is not high and the demand for power supply is high.
4)Photovoltaic charging alone: Regardless of whether there is mains, only PV charging is used. This mode is suitable for users with high electricity prices and low demand for electricity.
The above four inverter working modes are all selectable when both photovoltaic and mains are available. If there is no complementary power supply, the inverter will be in a working mode, that is, PV charging alone.