I have a 2013 2650s cdw with factory solar.
Mine was based on ZAmp products.
The panel is roof top 40 Watts.
There is a safety style toggle switch with cover down at the stairwell which disconnects the panel from the charger.
Mine had 2 chargers in the battery compartment. They are quite small and colored black. I had 2 batteries in the stair well and I was a bit confused as to the 2 chargers. After some thinking and head scratching I realized that one of the chargers was routed to the chassis battery and one to the coach batteries.
I believe that the chargers are zs-6aw. No display. Supposed to be 3 stage charger.
Behind service panel to access the water heater bypass switches I also found a Samlex battery guard which prevents the coach batteries from being drained below a certain voltage.
One my system, the switch is on in the down position. It used to have a system maintenance label.
On some sunseekers the solar ready may mean that there is a solar port near the entrance door that allows an external solar panel to be plugged in... typically the panels sit on the ground.
If you have the same configuration as mine, the 40 watt panel will not do a lot of heavy charging. Since there are 2 charge controllers each using the output from the panel, there will be even less for the coach batteries. I would call this configuration more of a battery maintainer rather than something that would charge last nights usage.
I assume that you mention the battery indicator lights on the convenience center panel. A 40 watt solar panel will not change the readout on that panel.... it would take quite a while to recharge the batteries. You could disconnect the charger from the battery and use a voltage meter to verify if it is sending energy to the battery.
I have since upgraded to separate 150 Watts solar panel and better charge controller which I use to charge 3 group 24 coach batteries. This configuration will pump some energy into the batteries but not likely enough for a full evening and night of use. I would have to double or more of that capacity to have a chance of long term off the grid.
I use the original 40 watt to maintain my chassis battery.
You can see the 2 zamp charge controllers at the top of step well
And the battery guard