Just for kicks turn your battery charger breaker off when running the genset, see if that takes care of the issue.
Before blue tooth speakers I ran my car stereo for music while running it. I'd hook up a battery charger while listening.. On some vehicles id get the buzz with a battery charger attached.
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https://www.crutchfield.com/S-hlde7D720yb/learn/learningcenter/car/noise_suppressors_installation_guide.html
Before blue tooth speakers I ran my car stereo for music while running it. I'd hook up a battery charger while listening.. On some vehicles id get the buzz with a battery charger attached.