What are grid-connected systems and off-grid systems?

There are two typical applications of photovoltaics, grid-connected systems and off-grid systems.

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The grid-connected system relies on the grid, and adopts the working mode of “spontaneous self-use, surplus electricity connected to the grid” or “full grid connection”. the

The off-grid system does not depend on the grid, but relies on the working mode of “storage while using” or “storage first and use later”. For households in off-grid areas or areas with frequent power outages, off-grid systems are very practical.

The main function of the photovoltaic inverter is to convert the direct current generated by the solar panel into the alternating current used by household appliances. All the electricity generated by the solar panel must be processed by the inverter before it can be exported to the outside world.

The use of photovoltaic inverters can be divided into two types: grid-connected inverters and off-grid inverters.

Off-Grid Inverter Complete System Solution Using Modular Components The Xantrex XW consists of a few manageable building blocks: XW inverter/charger, solar charge controller, automatic generator starter module, and system control board.

Grid-connected inverters are generally divided into photovoltaic power generation grid-connected inverters, wind power grid-connected inverters, power equipment power generation grid-connected inverters and other power generation equipment power grid-connected inverters. The biggest feature of the grid-connected inverter is the high power and low cost of the system.

Grid-connected inverters are generally used in large-scale photovoltaic power station systems. Many parallel photovoltaic strings are connected to the DC input end of the same centralized inverter. Generally, three-phase IGBT power modules are used for high-power ones, and the power is relatively low. Small use of field effect transistors, while using a DSP conversion controller to improve the quality of the generated power, making it very close to a sine wave current