Hi,
I hate the hum and the fan too. The "bright" folks who designed mine put the converter under the master bed. GRRRRRRRR.
You mention a transformer--do you mean a transfer switch?
I'm curious--how many watts of solar do you happen to have?
In my previous rv (1987) the Magnatec converter had a relay that disconnected the alternator charging circuit from the battery bank when shore power was being used. It hummed like mad--but at least it was under the dinette seat.
I too, would suggest upgrading to a better converter. The "big three" are Progressive Dynamics, Iota, and Power Max. All of them are good and all of them will blow away the older converter you currently have.
