Originally Posted by kcollins
No switches we can see.
Do you have a voltmeter?
You might try looking at all the connections in the solar system, from the MC4 connectors on the roof to a junction box on the roof if there is one, then on both sides of the solar controller.
If there are not switches on the panel or battery side of the solar controller, there might be some kind of on/off switch on the controller. Usually there isn't, and a circuit breaker type switch on the battery side of the controller is used to power it up, then another switch on the panel side is closed to start delivering power. Usually there's a light on the controller that lights up when you energize it via the battery side switch.
Have you found the solar controller? It's possible there is not one but that would be unusual.
Some photos should help.