Which of the following describes a characteristic of a direct coupled PV system?

A direct coupled PV system is characterized primarily by its operation in direct connection to a load, such as a water pump or a specific appliance, without the use of any energy storage system like batteries. This means that the system generates electricity during sunny conditions to directly power the connected devices. The characteristic that it functions only during sunlight availability accurately reflects this operation mode, as there is no stored energy to draw from during times when sunlight is not available.

Direct coupled systems are often employed for applications where it's feasible to use the energy immediately, ensuring that the generated power is used as it’s created. This arrangement simplifies the system’s design and, consequently, avoids complexities such as needing sophisticated inverters, making the system less dependent on external power management.

A battery storage system is not a feature of a direct coupled system; rather, it is typical of off-grid or hybrid systems that require energy availability at all times. The suggestion of requiring a complex inverter is not applicable to direct coupled systems, as they often use simpler configurations. Additionally, while direct coupled systems can be utilized in various sizes, they are not specifically designed for larger installations, which tend to integrate alternative systems for efficiency and energy management.