4. Product Protection and System Maintenance
4.1 Protections
● Waterproofing protection
Rating: IP32
● Input power limited protection
When the power of solar panel is higher than the rated value, the controller will limit
the power of solar panel within the rated power range to prevent damage by over
current, and the controller enter the current-limiting charge.
● Battery reverse polarity protection
If the battery polarity is reversed, the system will not work but it will not burn out
the controller.
● PV input end voltage is too high
If the voltage at the PV array input end is too high, the controller will automatically
shut off the PV input.
● PV input end short circuit protection
If the voltage at the PV array input end is short circuited, the controller will turn off
charging; after short circuit is removed, charging will automatically recover.
● PV input reverse polarity protection
When the polarity of PV array is reversed, the controller will not be damaged, and
normal operation will continue after wiring error is corrected.
● Night reverse charging protection
Prevent battery discharge through the solar panel at night.
● TVS lightning protection
● Over-temperature protection
When temperature of the controller exceeds the set value, it will reduce charging
power or stop charging.
4.2 System Maintenance
◆ In order to maintain the best long-term performance for controller, it is
recommended to conduct inspections twice a year.
◆ Make sure the airflow around the controller is not obstructed and remove any
dirt or debris from the heat sink.
◆ Check if the insulation layers of all exposed wires are damaged due to sun
exposure, friction with other objects nearby, dry rot, destruction of insects or
rodents, etc. If so, it is necessary to repair or replace the wire.
◆ Verify if indicators are consistent with the device operations. Please note to
take corrective actions for any malfunctions or error indications if necessary.
◆ Check all wiring terminals for corrosion, insulation damage, signs of high
temperature or burning/discoloration. Tighten terminal screws.
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