AM radio interference

Greetings. I'm new to this site. I recently had a 6 Kw PV system with battery backup installed. Now, when the inverters are running, I get a high-pitch whine on my AM radio. It happens on battery powered or AC powered radio, and the whine gets worse the closer I get to the inverter. My installer looked at the system and can't find any problems. Any ideas?
Thanks,
Don
Thanks,
Don
Comments
Long thread on that subject here http://forum.solar-electric.com/showthread.php?t=5887