What happens to current in a series connection of PV modules?

In a series connection of photovoltaic (PV) modules, the current remains constant regardless of the number of modules connected. This characteristic is fundamental to understanding how series circuits function. When modules are connected in series, the same current flows through each module. Therefore, the total current in the circuit does not change as more modules are added.

The overall voltage across the series connection does increase; each module adds its voltage to the total. However, the current remains uniform across each module. This consistency is critical for the efficiency and functionality of the solar array, as it ensures that all modules are operating at the same current level, which is required for harmonious performance.

While temperature can influence the current output of an individual module, in a series configuration, the current throughout the entire string will still be equal to the current produced by the weakest module in the series. This is an important concept in solar energy systems, as it emphasizes the importance of ensuring that modules in a series are matched in performance to avoid losses.