Power Optimizer

A power optimizer is a DC-to-DC converter installed on each individual solar panel that maximizes the power output of that panel before sending the electricity to a central string inverter. Optimizers are a type of module-level power electronics (MLPE) that offer a middle ground between basic string inverters and full microinverters.

Power optimizers work by performing Maximum Power Point Tracking (MPPT) at each panel, ensuring every panel operates at its optimal voltage and current regardless of shading, soiling, or manufacturing variations. Unlike microinverters, optimizers do not convert DC to AC — they condition the DC output and send it to a compatible string inverter for the DC-to-AC conversion. This two-stage approach is slightly more efficient than microinverters in ideal conditions while still providing panel-level optimization and monitoring. The leading manufacturer is SolarEdge, whose optimizers pair exclusively with SolarEdge inverters. Power optimizer systems also satisfy NEC rapid shutdown requirements. The typical cost premium over a basic string inverter is $500–$1,500 for a residential system, less than a full microinverter setup but with many of the same benefits.