The hybrid inverter covers high and new technologies such as grid-connected photovoltaic technology, off-grid power generation technology, battery charging and discharging and energy storage technology, and power distribution technology. When the grid power supply is normal, the device closes the bypass relay to realize the power supply from the grid to the household electrical loads; when the grid power supply is not normal (e.g. grid power failure, large fluctuation of grid voltage or frequency), the device can supply power to the household electrical loads through the battery, after inverting. When the sunshine intensity is suitable and the PV power generation function is normal, the device can also transmit power to the grid and sell power to the grid to obtain benefits.
Off-grid solar inverters can use energy from the grid and batteries to power electrical loads. For off-grid solar systems, batteries are mandatory. Grid-tied inverters are used for grid-tied solar systems where it is not possible to connect to the electrical load and all DC energy generated by the PV will be converted to AC by the grid-tied inverter and sent directly to the grid. For grid-connected solar systems, no batteries are required. However, hybrid inverter with solar battery charging can be used for both off-grid and grid-connected applications, so batteries can be configured flexibly.
Realize direct power supply from the grid to the load, reducing the demand for batteries
The hybrid solar inverter can supply power directly from the grid to the load when the grid is normal, which is different from the traditional off-grid system, and does not need to go through the battery to supply power to the load, which can greatly reduce the demand for batteries and lower the system cost.
With the backup power function
The hybrid inverter can start the battery to supply power to the load when there is no grid, or when the grid is unstable, to avoid power failure.
Can obtain revenue by selling electricity
The hybrid inverter can transmit the electricity from the PV power generation to the grid and sell the excess electricity to the state after removing the part of the electricity used by itself (requires local policy support from the state) to gain revenue.
The solar hybrid inverter is composed of the following units.
Grid-connected unit, this unit obtains solar energy from PV panels and a DC sink box, passes through the solar controller, stabilizes DC voltage, and feeds PV power into the public grid after the inverter unit.
The off-grid inverter unit supplies power to the load through the bypass relay when the grid power supply is normal and charges the battery pack at the same time, and provides an uninterrupted power supply to the load through the battery when the grid is abnormal. At this time, if the PV module generates electricity, the load can be powered through the PV off-grid inverter unit and the battery can be charged at the same time.
Switching unit, this unit is to realize the PV to supply power to the load by switching the relay and other devices when the light condition is suitable and the public grid is abnormal.
Other auxiliary units, such as the isolation unit and battery management unit, are used to realize the management of the battery bank, incoming and outgoing meters, PV panels, etc.
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