A power optimiser is a combination of both a string and micro inverter. It is a module-level power electronic (MLPE) device that increases the solar panel system’s energy output by constantly measuring the maximum power point tracking (MPPT) of each individual solar panel and adjusts DC characteristics to maximise energy output.
The panel optimisers relay performance characteristics via a monitoring system to facilitate operations and any necessary solar panel maintenance.
They are ideal for situations where shading is prevalent or when your solar system falls on multiple roof surfaces with different orientations. They give a small increase in performance by dealing with module mismatch and also can limit the loss in performance overtime due to debris accumulated on the surface of solar panels.