Grid-Tied Solar Inverters
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You can't use an off-grid inverter for a grid tie solar PV system. It can easily damage the whole system and here is why. Unlike off-grid inverters, grid tie inverters have a special control device to match the inverter cycles with the utility grid cycles. They need to be in phase, otherwise the voltages will cancel each other out.
On grid inverters are commonly used in applications where direct current voltage sources are connected to the grid, such as solar panels and small wind turbines. The output voltage frequency of the solar grid tie inverter needs to be same as the grid frequency (50 Hz or 60 Hz).
DC-AC converting is not its only function. Solar grid-tie inverter also gives the owner an option to monitor the functionality of the whole system. Besides, inverters can act as power output maximizers: they track the voltage of panels and identify the optimum operational power for the whole array.
Modern, off-grid inverters, or multi-mode inverters, can also be used to build advanced hybrid grid-tie energy storage systems. Many off-grid systems also use solar charge controllers (MPPTs), which are DC-coupled between the solar panels and battery, to regulate the charging process and ensure the battery is not over-charged.
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