What is the Difference Between an On-grid and Off-grid System?
On Grid systems and off-grid systems are two different application methods in the field of photovoltaic power generation, and there are significant differences between them.
The following is a detailed comparison of the two systems from many aspects:
(1) On Grid systems: This system converts the DC power generated by photovoltaic modules into AC power through an inverter and connects it to the external power grid. It can not only supply power to the grid, but also obtain power from the grid, achieving two-way flow of electrical energy.
(2) Off-grid system: This system is an independent power generation system that does not rely on the external power grid. It usually consists of photovoltaic modules, off-grid inverters, batteries and loads. It relies on the working mode of "storage and use" or "store first and then use" to ensure continuous power supply when there is no light or the power grid is outage.
(1) On Grid systems: Since the grid-connected system can exchange power with the grid in real time, additional energy storage devices are usually not required to store power. Excess electricity can be sold directly to the grid.
(2) Off-grid system: Off-grid system must be equipped with energy storage equipment (such as batteries) to provide power when there is no light or the power grid is outage. The capacity and performance of energy storage devices are critical to system stability and reliability.
(1) On Grid systems: The grid-connected system relies on power supply from the power grid and stops working when the power grid fails. It is more suitable for homes or businesses supported by stable power grids.
(2) Off-grid system: Off-grid system does not rely on the power grid at all and can operate independently in an environment without power grid support or when the power grid is unstable. It is more suitable for remote areas, areas without electricity, islands and other places.
In summary, there are significant differences between On Grid systems and off-grid systems in terms of connection methods, power storage and supply, system independence and application scenarios. Users can choose the appropriate system type based on their actual needs and environment.
