Photovoltaic inverters can convert DC voltage generated by photovoltaic solar panels into AC power. The photovoltaic power generation systems can be divided into two types: off-grid inverter and off-grid inverter.
So what is the difference between on-grid inverter and off-grid inverter?
The off-grid inverter is a system that is disconnected from the public grid. The DC power generated by the solar panel is first stored in the battery, and then transferred from the battery to the off-grid inverter for inversion. The output is AC power, which can be directly supplied to load use and it can also be returned to battery storage, which is more suitable for remote areas without power network coverage, such as deserts, plateaus, and deep forest areas. It can provide power anytime and anywhere. Off-grid inverters do not need to supply the remaining power to the public power grid.
Off-grid inverters generally use a complete system solution of modular components, consisting of some manageable building blocks: inverters, solar charge controllers, automatic generator starting modules, and system control boards
The on-grid inverter converts the DC current generated by the solar panel into AC current directly through the inverter, which can be directly supplied to the load. The excess power can be integrated into the public power grid. On-grid inverter inverters need to comply with the relevant regulations and policies of the local power grid when they are integrated into the grid, otherwise, on-grid inverters cannot be used. In many countries, homes or companies that have grid-connected power systems can sell the electricity they generate to power companies. The on-grid inverter can supply excess power to the grid for use.
The on-grid inverter can be directly used as an off-grid inverter. The grid-connected inverter sends energy directly to the grid, so it is necessary to track the frequency and phase of the grid, which is equivalent to a current source.
The off-grid inverter is equivalent to building an independent small grid by itself, mainly to control its own voltage, which is a voltage source.
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