It looks like the Sports use a manual switch rather than the remote relay. I'm not sure where it's located (near the battery, perhaps? That would make the most sense.) Even if that switch is in the OFF position, you'll have
12v power while plugged into shore power and solar will charge the battery but none of your
12v components will work when you unplug the shore power.
In the Sport manual on page 5-8 it shows a picture of the switch, but doesn't describe the location.