Is it feasible to mix series and parallel configurations in solar arrays?

Understanding Series and Parallel Configurations

In a solar array, series and parallel configurations are used to connect multiple modules together. In a series configuration, modules are connected end-to-end, and the voltage of each module adds up to the total voltage of the string. In a parallel configuration, modules are connected in a side-by-side arrangement, and the current of each module adds up to the total current of the string. A series-parallel configuration combines these two approaches to achieve the desired voltage and current requirements.

Designing a Hybrid Series-Parallel (HSP) Configuration

To design an HSP configuration, you need to determine the required voltage and current for your solar array. Let’s assume you need 48V DC and 500A of current. You can divide the array into multiple series strings, each consisting of 10 modules in series, resulting in a total of 480V per string. You can then connect these strings in parallel to achieve the required current of 500A. For example, you can connect 2 strings in parallel to achieve 960V and 500A. This HSP configuration allows you to optimize system performance while minimizing the number of modules and connections.

Practical Considerations

When designing an HSP configuration, it’s essential to consider the following factors: voltage and current mismatches, module selection, and wiring and connections. You should select modules with a similar voltage and current rating to ensure efficient operation. You should also ensure that the wiring and connections can handle the high currents and voltages involved in an HSP configuration. Additionally, you should consider using a maximum power point tracking (MPPT) system to optimize energy harvesting from the solar array. By carefully designing and implementing an HSP configuration, you can achieve high efficiency and reliability in your solar array.