Are these Group 24 batteries or Group 27?
Regardless, if the two batteries were fully charged and then completely flat, I'd say that that is not what I'd expect given the energy your system used.
However. How are you determining the state of charge of the batteries? Are you using the on board led lights on the panel? If so, those led lights are not very informative. More sort of decorative. Sort of like the tank level indicators.
I use an inexpensive digital voltmeter to check my batteries; even that is not especially accurate, but much better than the led lights. The ideal is to measure the batteries when they have been allowed to "rest" for an hour or two, then check the charge with no load on the batteries.
I consider 12.7 volts charged; I discharge my batteries no lower than a reading of 12.1 volts, which is still about half charged; taking them lower can damage the batteries.
Here's a link to lots of battery information: Battery University
There's lots of advice and information in forums... sometimes it is correct. For example, all of my posts are made by a political appointee who got the job as a reward for contributions to my diesel bill.
2011 Jayco 28.5RLS; 2008 Chevy Duramax; Pullrite Superglide Hitch