It's highly unusal for a converter to cause noise on a radio in your house, but it can happen. I'm assuming that you have a trailer battery connected to your converter and that the converter is chargingthe battery. This brand of converter requires that a battery be connected to it. The battery acts like a giant filter to remove any electronic noise produced by the converter. If the battery is connected and the noise still persists, then it could be a warranty issued as was previously mentioned.
Helen & George VE3INB and Max (Bichon Frise)
2006 Silverado 2500HD D/A,
2006 Cruiser CF30SK