I recently bought a cheap Chinese auto battery maintainer from Amazon. It doesn't have one of those ferrite coils on its power cord and when plugged in it causes a lot of AM radio noise within about a 50' radius of the charger. What a racket. I wish I had saved my Zero OBC ferrite coil to use on that device.
I had that issue with an old HFT battery maintainer in Auburn. The electrical noise from the garage to the den was very high to my ham radio stuff. That one is no longer sold in the USA. I assume they did not meet part 15 of the FCC rules and had enough complaints that they can no longer be sold here.
But the electric noise can also be direct from the unit. A ferrite core may help, but you never know until it is tried. Getting rid of such interference is far from an exact science. Perhaps the best way is experimentation and in many cases will be hopeless no matter what is tried, especially dealing with AM radio.
But you can buy
ferrite cores for AC lines here. They cannot hurt, but there is no guarantee that they will help much. But could be worth a try. They will reduce the noise going into the AC outlet, but that may or may not be the main issue. Have to try it to see if it helps enough to make a noticeable difference.
-Don- Reno, NV
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Topic: 2017 SR tripped breaker while charging, electric smell (Read 719 times)