Here are some helpful tips and answers to a few frequently asked questions:
The LED has stopped working…
Solution: Disconnect the battery connections (red/black wires) and reconnect them. Do this at dusk or with the solar panel covered or disconnected.
Detailed Explanation: This is a feature not a fault. The LED can be disabled to save a small amount of power. But it is possible to disable the LED inadvertently. LED function is restored if the controller is disconnected from its power source. Disconnecting the battery connections normally works, but if there’s power coming from the solar panel, the controller can continue to function without the battery connected. Disconnecting both solar panel and battery will always work, but if disconnecting the solar panel is inconvenient, you can cover the panel or just wait until it’s getting dark.
My panel is connected but there’s no output…
Solution: Connect the red/black wires to a 12 volt lead-acid battery.
Detailed Explanation: The charge controller does not work like a voltage regulator. If you connect a solar panel to the yellow/black leads, you will measure nothing (or a meaningless voltage) on the red/black leads unless they are connected to a battery. In fact the only meaningful voltage measurements you can make are at the battery terminals.