The move away from fossil fuels has led to an increase in solar and wind energy. Solar panels produce electrical energy that is DC. To make this usable in the power grid, it must first be converted to AC at the correct amplitude and frequency synchronised with established generators. Solar panel inverters have DC inputs and AC outputs. Both must be tested for EMC as well as electrical safety. Specialist high current Coupling Decoupling Networks are needed that can work with EFT/Burst, Surge and Ringwave impulses.