A photovoltaic, PV, grounding system comprising: a plurality of ac-voltage modules, each ac-voltage module comprising a dc-ac micro-inverter, each micro-inverter comprising a respective chassis ground, wherein each micro-inverter is configured together with a corresponding PV dc-voltage module to provide the respective ac-voltage module comprising a male ac-power connector and a female ac-power connector, each ac-power connector comprising a dc-voltage ground conductor electrically connected to a corresponding chassis ground; characterized in that each ac-voltage module comprises a metallic enclosure that includes the male ac-power connector and the female ac-power connector, the male ac-power connector of each ac-voltage module being located at a first side of the respective metallic enclosure and the female ac-power connector of each ac-voltage module being located at a second side of the respective metallic enclosure, wherein the second side is opposite to the first side, the male ac-power connector being a male ac-voltage plug and play connector, the female ac-power connector being a female ac-voltage plug and play connector, and in that the PV grounding system further comprises a frame structure comprising a metallic grounding frame configured to receive the plurality of ac-voltage modules such that the plurality of ac-power connectors, when connected together, carry a dc-voltage ground connection from ac-voltage module to ac-voltage module through the plurality of ac-voltage modules via the plurality of dc-voltage ground conductors, wherein the frame structure comprises a rail structure for mounting the plurality of ac-voltage modules, the rail structure including a plurality of metallic, electrically conductive mounting rails, each male ac-voltage connector comprising a pair of ac-voltage pins, a neutral connector pin, and a dc-voltage ground connector pin, the corresponding female ac-power connector comprising a pair of ac-voltage pin slots, a neutral connector pin slot and a dc-voltage ground connector pin slot, the male and female connectors being keyed to ensure proper electrical alignment when the ac-voltage modules are slid together. a plurality of ac-voltage modules, each ac-voltage module comprising a dc-ac micro-inverter, each micro-inverter comprising a respective chassis ground, wherein each micro-inverter is configured together with a corresponding PV dc-voltage module to provide the respective ac-voltage module comprising a male ac-power connector and a female ac-power connector, each ac-power connector comprising a dc-voltage ground conductor electrically connected to a corresponding chassis ground; characterized in that each ac-voltage module comprises a metallic enclosure that includes the male ac-power connector and the female ac-power connector, the male ac-power connector of each ac-voltage module being located at a first side of the respective metallic enclosure and the female ac-power connector of each ac-voltage module being located at a second side of the respective metallic enclosure, wherein the second side is opposite to the first side, the male ac-power connector being a male ac-voltage plug and play connector, the female ac-power connector being a female ac-voltage plug and play connector, and in that the PV grounding system further comprises a frame structure comprising a metallic grounding frame configured to receive the plurality of ac-voltage modules such that the plurality of ac-power connectors, when connected together, carry a dc-voltage ground connection from ac-voltage module to ac-voltage module through the plurality of ac-voltage modules via the plurality of dc-voltage ground conductors, wherein the frame structure comprises a rail structure for mounting the plurality of ac-voltage modules, the rail structure including a plurality of metallic, electrically conductive mounting rails, each male ac-voltage connector comprising a pair of ac-voltage pins, a neutral connector pin, and a dc-voltage ground connector pin, the corresponding female ac-power connector comprising a pair of ac-voltage pin slots, a neutral connector pin slot and a dc-voltage ground connector pin slot, the male and female connectors being keyed to ensure proper electrical alignment when the ac-voltage modules are slid together.