Shaded Locations: Are Microinverters The Clear Winner Over String Models?

Understanding Shaded Solar Arrays

Shaded locations can significantly reduce solar array efficiency, particularly when using string inverters. These devices combine the output of multiple panels into a single DC output, making it challenging to isolate and adjust for individual panel conditions. In contrast, microinverters sit beneath each panel and adjust for optimal energy production, even in shaded conditions. A 20% shade reduction can be mitigated by up to 50% using microinverters.

Microinverter Advantages in Shaded Locations

Microinverters offer several advantages in shaded locations, including improved energy production, reduced energy loss, and increased equipment lifespan. For example, a 1 kW solar array with 20% shading might produce 720 kWh/year with a string inverter, but up to 900 kWh/year with microinverters. This increased energy production can be attributed to the ability of microinverters to isolate and adjust for individual panel conditions.

Installation Considerations

When installing microinverters in shaded locations, it’s essential to consider the optimal placement of panels to ensure maximum energy production. This involves carefully positioning panels to minimize shading effects, ideally with a 10% to 20% gap between panels for easy cleaning and maintenance. In addition, using a solar array optimizer can further enhance energy production by up to 5% in shaded conditions.