Tigo TS4 Optimisers. Retro-fit / clip on optimisation for Solar PV.
These units negate the need for full array optimisation allowing you to optimise only PV modules that need it. Useful for shaded areas the optimisers work on impedance matching to draw the maximum output from each individual module.
If a full array is optimised individual modules can be monitored through the Tigo SMART APP (CCA kit required)