This is typical for how solar works in an RV set up: solar panels to a brain/charge controller to battery(s) to store the energy. Battery to 12v devices, or battery to inverter to 120v devices. This is actually great because it stores energy in the battery instead of wasting it. Furthermore, in full sun it's not a 'trickle'. 200w of panels can flow over 10 amps into the battery. (This is why folks who boondock often increase the battery capacity by adding batteries, getting bigger batteries or upgrading to lithium batteries. The more capacity, the more power you can use.) How do you think it works? Why do you think this is disappointing?
What kind of fans do you want to run? The bathroom fan? Do it! That's what I found was best to move air. Open the front roof vent and the bath roof vent and run the fan. It pulls air in the front, through the small coach and out the back. I did upgrade that bathroom fan though.
There are 12v fan options out there as well that just plug into the cigarette lighter DC plug. I have a RoadPro model that is popular online that does that. It will also run on 'D' batteries as well.
Finally, you can install some sort of inverter to run 120V fans and things. This can be a smaller version that you can plug directly into, or a larger version that is wired to power all of your 120v outlets. It's just time, convenience and money as to what you'd like to do there.
Stay cool, LTL