Yes it is More then expected, also the inverter fan down by the fuse panel seems to kick off at 3AM. We found that leaving the AC fan on low continuously helps drown out the noise. We just finished two trips, over 4,000 miles and loved the 2304DS. We added a 3" foam to the Sealy mattress and sleep much better. Good luck with yours.
Chuck and Dianne and the two doxies, Hans and Fritz
2016 2304DS, 2014 Chevy Silverado