Xantrex Freedom Series 458 Inverter issues

[Cheri Smith]

I have a Xantrex Freedom 458 inverter / charger. On my most recent trip it did not seem to switch from battery power to shore power. It seemed that coach continually worked off the batteries with the charger / inverter continually recharging the battery. I know inverters / chargers sometimes emit an audible humming sound but this time it seemed louder than usual.

The way I checked verify it was not running on shore power was to turn off the battery charger on the remote panel of the inverter /charger and see what happened. While running the water pump and fan for a period of time, I noticed the batteries were draining.

I thought that the transfer switch should kick in and run off shore power with the charger / inverter only charging the batteries as needed, not supporting the whole coach at all times. Is that a correct assumption?