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5. Protections, Troubleshooting and Maintenance
5.1 Protection
PV Short Circuit
When not in PV charging state, the controller will not be damaged in case of a short-circuiting in the PV
array.
PV Reverse Polarity
When the polarity of the PV array is reversed, the controller may not be damaged and can continue to
operate normally after the polarity is corrected.
PV Over Voltage
When the PV voltage is higher 60V, the controller will cut off the charging automatically, and when the
voltage is lower than 55V, the controller will recover charging. automatically
Charging Battery Cut Off
Disconnect the battery when the controller is charged at rated power , the controller do not be damaged
Load Overload
When the load is overloading (The overload current is
≥ 1.05 times the rated load current), the controller
will automatically cut off the output. If the load reconnects automatically, it needs to be cleared by
pressing the Load button restarting the controller.
Load Short Circuit
Fully protected against load wiring short-circuit
（
≥2 times rated discharge current
）
. After five automatic
load reconnect attempt, the fault must be cleared by restarting the controller or pressing the switch
button.
Damaged Temperature Sensor
If the temperature sensor short-circuited or damaged, the controller will be charging or discharging at the
default temperature 25
℃
to prevent the battery damaged from overcharging or over discharged.
Controller Overheating
The controller is able to detect the temperature inside the battery. The controller stops working when its
temperature exceeds 85 °C and restart to work when its temperature is below 75 °C.
TVS High Voltage Transients
The internal circuitry of the controller is designed with Transient Voltage Suppressors (TVS) which can
only protect against high-voltage surge pulses with less energy. If the controller is to be used in an area
with frequent lightning strikes, it is recommended to install an external surge arrester.