This is usually caused by one of the following issues. Please check in this order: Battery aging: Battery lifespan is typically 5-7 years. If your system has been in use for a long time, the battery may need replacement. Dirty or shaded solar panel: Clean the panel surface to remove dust, leaves, or debris, and ensure no new trees or structures are casting shadows. Loose wiring or blown fuse: Check the connections between the charge controller and the battery, and inspect the fuse. If the problem persists, please contact our technical support team.

The simplest way is to use a multimeter. On a sunny day, measure the voltage directly at the panel\\\'s output terminals. The reading should show a DC voltage matching its nominal specification (e.g., for a nominal 12V panel, the open-circuit voltage might read around 20-22V). An abnormally low or zero reading indicates a potential issue.

No, you can rest assured. All our solar panels are equipped with a blocking diode, which automatically cuts off the circuit at night to prevent current from flowing back from the battery to the panel, thus protecting the battery from unnecessary discharge.

This depends on whether you use our matched solar charge controller, which is an essential system component. The controller\\\'s core function is to prevent battery overcharging. It intelligently regulates the charging current based on the battery\\\'s status and automatically switches to float charging or cuts off the power when the battery is full, ensuring safety and prolonging battery life.