What Happens To Solar Production Under Partial Shading With Different?

Inverter Behavior Under Partial Shading

Inverters that support MPPT, such as string inverters, can detect the presence of partial shading and adjust the voltage of the shaded section to maximize power output. This is achieved by creating a ‘virtual’ MPPT point within the shaded section, allowing the inverter to capture as much energy as possible. However, if the shading is severe, the inverter may still disconnect the shaded portion to prevent a voltage drop that could damage the array.

Microinverters vs. String Inverters

Microinverters, which are installed at the individual module level, can maintain power output even under severe partial shading, as they are not reliant on a single string voltage. However, the overall power output of the array may still be reduced due to the mismatched power production of the shaded and unshaded sections. In contrast, string inverters typically cannot maintain power output under severe partial shading, as the voltage drop can be significant and lead to system instability.

Best Practices for Partial Shading Scenarios

To mitigate the effects of partial shading, it is essential to design the solar array with a suitable configuration, such as using multiple strings or microinverters to isolate shaded sections. Regular monitoring and maintenance can also help identify and address shading issues before they impact system performance. Inverters with advanced features, such as DC-DC optimization, can also help optimize power production under partial shading conditions.