Module-Level Power Electronics (MLPE)

Module-Level Power Electronics (MLPE) is a category of equipment installed at or near each individual solar panel to improve monitoring, safety, and energy production. The two most common types of MLPE are microinverters and DC power optimizers.

MLPE devices allow each panel in an array to perform independently. This is a significant advantage over traditional string inverter setups, where one underperforming panel can drag down the output of the entire string. With MLPE, shaded or dirty panels only affect their own output. MLPE also provides panel-level performance data, making it easier to identify issues and maintain the system. In addition, MLPE devices are required by the National Electrical Code (NEC) rapid shutdown requirements, which mandate that rooftop solar systems can quickly de-energize in an emergency for firefighter safety. While MLPE adds to the upfront system cost, the improved energy harvest and safety features make it the standard for most modern residential solar installations.