According to Schurter, modern solar inverters, that use MPP (maximum power point) trackers, generate disturbances into both the grid's AC power line, as well as the DC side of the solar module. An AC filter is normally used on the grid's AC power line, but the noise generated on the DC side tends to be overlooked. EMC standards EN 61000-6-3 and EN55014-1 also put limits on the noise generated from lines not connected to the grid, such as, for example, the line to the solar panels. Meeting these limits can be achieved by using a DC filter on the DC side of the inverter. The company's FMER SOL DC filters are for rated currents from 25 to 1500A at 55°C ambient temperature, and voltages up to 1200V DC. The filters are cURus-approved for 150A, 600 and 1000V DC for types upwards of 250A.
