Solar panel producing power but battery not charging

Panels showing voltage/current output on the controller display but the battery isn't actually charging usually means the connection between the controller and battery is the problem, not the panels or controller itself — a blown fuse, a loose connection, or a battery disconnect switch left open are the most common causes. Confirm the controller itself shows it's in a charging state (not just seeing solar input) before chasing wiring. What does the controller display show for charge state?