Photovoltaic, PV systems and inverters
PV systems in operation generate both, static and alternating electric and magnetic fields. The strength of the fields depends on the design of the inverter, the performance of the system and also the way, in which the modules, in series or parallel, are interconnected.
Due to the direct current of electricity in the PV cells, the fields are mainly DC fields and therefore less critical for the health. Electrical fields can hardly penetrate into buildings and moreover, can be shielded easily. Magnetic fields on the other hand penetrate building envelopes full force and are very hard to shield.
Biologically much more effective than static fields are alternating fields, AC fields. These arise in PV systems in addition to the static fields by reactions from the network and by superposition of the DC current in the PV-circuit with AC shares from the grid.