I have a 14KW system with ABB 250 watt micro inverters. No RFI. However, they no longer produce the micro inverters. The were built to European standards which I had been told are much tighter than USA standards. I got a 30% federal tax credit the year I installed them. I ran the numbers at $0.10 per kwh. My pay back is about 10 years. //Allen N5RMS