This paper deals with test set-ups and the definition of limits for electromagnetic emissions on the DC side of PV systems. Conducted emissions on AC lines and radiated emissions from the housing are sufficiently covered by existing standards. However the DC side of PV components is still undefined in standardisation. Because of the large spatial extension of PV generators and long lines (several 10 meters) the DC side of PV systems must be investigated in terms of EMC (Electromagnetic Compatibility). Therefore the whole PV system is characterised from a radio frequency (RF) point of view by means of measurements and simulations. Test set-ups were defined in order to measure electromagnetic disturbance signals on DC Lines. In the frequency range below 30 MHz the disturbance voltage on DC lines is measured. A stabilisation of the RF impedance of the DC line is necessary in order to make re- producible measurements. This is achieved by means of a special line impedance stabilisation network (LISN) which acts as a standardised replacement for the PV generator in terms of RF engineering. Based on measurements and simulations of radiated electromagnetic fields at different PV plants, new limit lines for emissions on DC lines were defined. Measurements of PV inverters with regard to the new limit lines show that a compliance with the limits is easily possible with reasonable technical effort. KEYWORDS: Electromagnetic Compatibility (EMC) - 1: PV System - 2: Inverter - 3