Solar optimisers are a small box attached to the back of every solar panel which operate with a string inverter. This enables the maximum energy output from each individual panel. Optimisers can be inbuilt within the panels themselves or fitted separately.
In traditional solar strings without optimisers, issues such as shading on a single panel would affect the entire string equally. For example, shading 50% of one panel would reduce the entire system efficiency by 50%. The benefit of optimisers lessens the impact of shaded panels on the overall system output while also offering individual panel performance monitoring.
The other additional benefit is that optimisers are less expensive than micro-inverters and achieve all the same benefits at higher efficiency and with higher reliability.