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

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