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4. Troubleshooting
1. Charging LED indicator turns off during the daytime
a. The green LED should be ON during the daytime.
b. Check to make sure the correct battery is being used.
c. Check all wiring connections to make sure they are in their designated locations
and make sure that there are no loose connections.
d. Measure the PV array open-circuit voltage and confirm it is within its normal
limits.
e. Measure the PV voltage and the battery voltage at the controller terminals. If the
voltage at the terminals is within proper specifications, the PV array is charging
the battery properly. If the PV voltage is within specifications to the open circuit
voltage rating of the panels, but the battery voltage is low, the charge controller
may not be charging the battery and it may be damaged.
2. Charging LED indicator is blinking
a. Check the operating conditions to confirm that the voltage is higher than the
specifications. Consider the temperature compensation of the charge controller’s
PWM set point. For example, at 0°C the charge controller will regulate at about
15 volts.
b. Check all wire connections in the system to ensure they are in the correct
location. Check for loose wires.
3. Red load LED indicator is blinking or flashing (load not operating properly)
a. Check the load to make sure it is on and make sure the fuses are not blown.
b. Check connections to the load, other controllers, and battery. Make sure the
voltage drops in the system wires are not exceeded.
c. If the LED indicator is blinking and there is no output, check the load for short-
circuit. In case of short-circuit, disconnect the load and press the SET button, and
wait for approximately 30 seconds for the charge controller to resume working
again.
d. If the LED indicator is still flashing and there is no output, check the load to make
sure the load is not over the rated power. Reduce the load and press the SET
button. Then wait for approximately 30 seconds for the charge controller to
resume working again.
