Which of the following statements is NOT true about solar inverters?
A stand-alone inverter is supposed to work as an AC voltage source for a specified range of AC loads.
An ideal grid-tied inverter has its operational voltage and frequency synchronized with those of the grid.
A bimodal inverter can power backup loads even if the grid-connection is disrupted.
An ideal grid-tied inverter works as a perfect voltage source, and changes the grid voltage and frequency to match its own.
To determine which statement is NOT true about solar inverters, let's analyze each option:
1. A stand-alone inverter is supposed to work as an AC voltage source for a specified range of AC loads.
This statement is generally true. A stand-alone inverter is designed to convert the DC (Direct Current) power from a solar panel system into AC (Alternating Current) power for use by electrical loads. It typically operates as an AC voltage source, providing power within a specific range of loads.
2. An ideal grid-tied inverter has its operational voltage and frequency synchronized with those of the grid.
This statement is also true. An ideal grid-tied inverter is designed to synchronize its voltage and frequency with the electrical grid it is connected to. This ensures that the inverter's output matches the grid's parameters, allowing it to feed excess power back into the grid or draw power from the grid when needed.
3. A bimodal inverter can power backup loads even if the grid-connection is disrupted.
This statement is true. A bimodal inverter, also known as a hybrid inverter, is capable of operating in both grid-tied and off-grid modes. It can power backup loads from battery storage even if the grid connection is disrupted, making it useful for areas with unreliable or intermittent grid connections.
4. An ideal grid-tied inverter works as a perfect voltage source and changes the grid voltage and frequency to match its own.
This statement is NOT true. In a grid-tied system, the grid voltage and frequency are typically maintained by the utility provider. An ideal grid-tied inverter does not change the grid voltage or frequency but instead matches its own output to that of the grid. It acts as a current source, adjusting its output to inject or absorb power to/from the grid without altering the grid's fundamental properties.
Therefore, the statement that is NOT true about solar inverters is: "An ideal grid-tied inverter works as a perfect voltage source, and changes the grid voltage and frequency to match its own."