1. Correctly connect the "+" and "-" of the battery to the corresponding terminals of the controller (the 3rd and 4th connection terminals from the left). 2. Correctly connect the "+" and "-" of the solar panel to the corresponding terminals of the controller (the first and second wiring terminals from the left). 3. Correctly connect the "+" and "-" of the load to the corresponding terminals of the controller (the 5th and 6th wiring terminals from the left). 4. The charging indicator light is always on to indicate that it is charging strongly; flashing to indicate that it is floating charging; if it is off, it means that charging has stopped. 5. When the load indicator light is always on, it means there is output and the load can work; if it is off, it means there is no output and the load cannot work.