如何选择离网逆变器的工作模式​

适用场景 ：应用于无电地区或者缺电地区，市电的电价较高，还经常停电的地方，需注意蓄电池电量要用到低值时，逆变器才会切换到市电带负载，优点是光伏利用率很高， 缺点是用户的用电不能完全保证，当蓄电池的电用完，但市电恰好停电时，就没有电可以用了。对用电要求不是特别高的用户，可以选择该模式。

Photovoltaic preferential mode of electricity consumption

Working principle: photovoltaic gives priority to the load power supply, when the photovoltaic power is less than the load power, energy storage battery and photovoltaic power supply to the load, when there is no photovoltaic or battery power is insufficient, if the detection of mains power, the inverter automatically switches to the mains power supply.

Applicable scenario: applied to without power or the power shortage region, mains electricity price is not high, frequent blackouts, note if there is no photovoltaic (pv), but there was plenty of battery power, the inverter will switch to the on load, electric defect is cause certain power waste, advantage is that if the mains power outages, and electric battery, can continue to load. Users with high demand for electricity can choose this mode.

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Power grid priority mode

Working principle: No matter whether there is photovoltaic, battery or not, as long as there is mains electricity detected, it is powered by mains electricity to the load, only after the mains power failure is detected, it is switched to photovoltaic and battery to power the load.

Application scenario: It is applied to the place 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 and the initial investment is low.

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Battery priority mode

When the photovoltaic power is less than the load power, the energy storage battery and photovoltaic power supply to the load together, when there is no photovoltaic, battery power supply to the load alone, when the battery power is insufficient, if the detection of mains power, the inverter automatically switches to the mains power supply.

Applicable scenario: applied to without power or the power shortage region, the mains electricity price is higher, often power outages, battery is in low power to use, should pay attention to the inverter can switch to the on load, electric, advantage is photovoltaic utilization rate is very high, the disadvantage is that users of electricity can't guarantee, when the battery of electric exhausted, but mains power failure, no electricity can be used. This mode can be selected for users who do not have high demand for electricity.