Protections, Troubleshooting And Maintenance; Protection - Epever XTRA N Series User Manual

5. Protections, Troubleshooting and Maintenance

5.1 Protection

When the charging current or power of the PV array exceeds the controller's rated current or power, it will be charge at the rated
PV
Over
current or power.
Current/power
NOTE: When the PV modules are in series, ensure that the open-circuit voltage of the PV array does not exceed the "maximum PV open-circuit
voltage" rating. Otherwise the controller may be damaged.
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.
When the polarity of the PV array is reversed, the controller may not be damaged and can continue to operate normally after the
PV Reverse Polarity
polarity is corrected.
NOTE: If the PV array is reverse connected to the controller,1.5 times rated controller power(watts)from the PV array, will damage the controller.
Night Reverse Charging Prevents the battery from discharging to the PV module at night.
Fully protected against battery reverse polarity; no damage will occur to the battery. Correct the miswire to resume normal operation.
Battery Reverse Polarity
NOTE: Limited to the characteristic of lithium battery, when the PV connection is correct and battery connection reversed, the controller will be
damaged.
When the battery voltage reaches the over voltage disconnect voltage, it will automatically stop battery charging to prevent battery
Battery Over Voltage
damage caused by over-charging.
When the battery voltage reaches the low voltage disconnect voltage, it will automatically stop battery discharging to prevent battery
Battery Over Discharge damage caused by over-discharging. (Any controller connected loads will be disconnected. Loads directly connected to the battery
will not be affected and may continue to discharge the battery.)
The controller can detect the battery temperature through an external temperature sensor. The controller stops working when its
Battery Overheating
temperature exceeds 65 ° C and restart to work when its temperature is below 55 ° C.
When the temperature detected by the optional temperature sensor is lower than the Low Temperature Protection Threshold(LTPT),
Lithium Battery Low
the controller will stop charging and discharging automatically. When the detected temperature is higher than the LTPT, the
Temperature
controller will be working automatically (The LTPT is 0 ° C by default and can be set within the range of 10 ~ -40 ° C).
When the load is short circuited (The short circuit current is ≥ 4 times the rated controller load current), the controller will
Load Short Circuit automatically cut off the output. If the load reconnects the output automatically five times (delay of 5s, 10s, 15s, 20s, 25s), it needs to
be cleared by pressing the Load button, restarting the controller or switching from Night to the Day (nighttime > 3 hours).
When the load is overloading (The overload current is ≥ 1.05 times the rated load current), the controller will automatically cut off the
Load Overload output. If the load reconnects automatically five times (delay of 5s, 10s, 15s, 20s, 25s), it needs to be cleared by pressing the Load
button restarting the controller, switching from Night to Day (nighttime > 3 hours).
The controller is able to detect the temperature inside the battery. The controller stops working when its temperature exceeds 85 ° C
★
Controller Overheating
and restart to work when its temperature is below 75 ° C.
The internal circuitry of the controller is designed with Transient Voltage Suppressors (TVS) which can only protect against
TVS High Voltage
high-voltage surge pulses with less energy. If the controller is to be used in an area with frequent lightning strikes, it is recommended
Transients
to install an external surge arrester.
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