In PV systems, how is the maximum PV source current calculated?

The maximum PV source current is calculated by summing the short-circuit current ratings of the modules connected in parallel. This is because in a parallel configuration, each module contributes its own short-circuit current to the total output. The short-circuit current rating of a module represents the maximum current the module can produce under short-circuit conditions, reflecting its capability to generate current.

When modules are wired in parallel, their currents add together, which is why it's essential to consider the short-circuit current ratings directly. This ensures that the system can handle the combined maximum current without exceeding the allowable limits for conductors or overcurrent protection devices.

Alternatively, calculating the total wattage of modules does not directly provide a current value, as current is influenced by both voltage and power (using the formula P = VI). Simply relying on the average current produced does not consider the peak conditions necessary for system design and safety. Lastly, focusing on the short-circuit current ratings of modules in series would inaccurately represent how current behaves in parallel configurations, as the current remains constant in series connections while voltage adds up.