In the off-grid system with mains complement, the inverter has three working modes: mains, battery priority, and photovoltaic. The application scenarios and requirements of photovoltaic off-grid users vary greatly, so different modes should be set according to the actual needs of users to maximize photovoltaics and meet customer requirements as much as possible.
PV priority mode: Working principle: PV gives power to the load first. When the PV power is less than the load power, the energy storage battery and PV together supply power to the load. When there is no PV or the battery is insufficient, if it detects that there is utility power, the inverter will automatically switch to Mains power supply.
Applicable scenarios: It is used in areas without electricity or lack of electricity, where the price of mains electricity is not very high, and in places where there are frequent power outages, it should be noted that if there is no photovoltaic, but the battery power is still sufficient, the inverter will also switch to the mains The disadvantage is that it will cause a certain amount of power waste. The advantage is that if the mains power fails, the battery still has electricity, and it can continue to carry the load. Users with high power requirements can choose this mode.
Grid priority mode: Working principle: No matter whether there is photovoltaic or not, whether the battery has electricity or not, as long as the utility power is detected, the utility power will supply power to the load. Only after detecting the utility power failure, will it switch to photovoltaic and battery to supply power to the load.
Applicable scenarios: It is used in places where the mains voltage is stable and the price is cheap, but the power supply time is short. The photovoltaic energy storage is equivalent to a backup UPS power supply. The advantage of this mode is that the photovoltaic modules can be configured relatively less, the initial investment is low, and the disadvantages Photovoltaic energy waste is relatively large, a lot of time may not be used.
Battery priority mode:Working principle: PV gives power to the load first. When the PV power is less than the load power, the energy storage battery and PV together supply power to the load. When there is no PV, the battery power supplies power to the load alone. , the inverter automatically switches to the mains power supply.
Applicable scenarios: It is used in areas without electricity or lack of electricity, where the price of mains electricity is high, and there are frequent power outages. It should be noted that when the battery power is used to a low value, the inverter will switch to the mains with load. Advantages The photovoltaic utilization rate is very high. The disadvantage is that the user’s electricity consumption cannot be fully guaranteed. When the battery’s electricity is used up, but the mains power just happens to be cut off, there will be no electricity to use. Users who do not have particularly high requirements on electricity consumption can choose this mode.
The above three working modes can be selected when both photovoltaic and commercial power are available. The first mode and the third mode need to detect and use the battery voltage to switch. This voltage is related to the type of battery and the number of installations. . If there is no mains complement, the inverter has only one working mode, which is the battery priority mode.
Through the above introduction, I believe that everyone can choose the working mode of the inverter according to the most suitable situation! If you want to know more, you can contact us for more professional guidance!
Post time: Oct-31-2023