First of all, don't be so afraid of electromagnetic radiation, electromagnetic radiation is not a beast. Then the photovoltaic inverter itself is a few switching tubes composed of bridge circuits, switching frequency roughly in the kHz order of magnitude, far from enough to cause cancer. The electric field and magnetic field and so on are staying in the inductance and capacitance, and there is little leakage out. Photovoltaic power generation itself is relatively high cost, the conversion is to be carefully calculated, if the external radiation is too high, the efficiency itself will be very low, manufacturers sell this kind of thing is not to make money. I can guarantee that you can buy a home small capacity PV inverter radiation will not be very large, more likely to cause cancer
The trouble adopted, thank you!