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4. Protections, Troubleshooting and Maintenance
4.1 Protection
PV Over
Current/power
When the charging current or power of the PV array exceeds its rated current or
power, it will be charged at the rated current or 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
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.
NOTE: If the PV array is reverse connected to the controller,1.5 times rated
controller powr (watts)from the PV array, will damage the controller.
NightReverse
Charging
Prevents the battery from discharging through the PV module at night.
Battery Reverse
Polarity
Fully protected against battery reverse polarity; no damage to the controller
will result. Correct the miswire to resume normal operation.
Battery Over Voltage
When the battery voltage reaches the over voltage disconnect voltage, it will
automatically stop battery charging to prevent battery damage caused by over-
charging.
Battery Over
Discharge
When the battery voltage reaches the low voltage disconnect voltage, it will
automatically stop battery discharging to prevent battery 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.)
Battery Overheating
The controller can detect the battery temperature through an external temperature
sensor. The controller stops working when its temperature exceeds 65 °C and
begins working when its temperature is below 55 °C.
Lithium Battery Low
Temperature
When the temperature detected by the optional temperature sensor is lower than
the Low Temperature Protection Threshold(LTPT), the controller will stop charging
and discharging automatically. When the detected temperature is higher than the
LTPT, the controller will be working automatically (The LTPT is 0 °C by default and
can be set within the range of 10 ~ -40 °C).
Load Short Circuit
When the load is short circuited (The short circuit current is ≥ 4 times the rated
controller load current), the controller will 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).
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 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).
Controller
Overheating
★
The controller is able to detect the temperature inside the battery through an
optional remote sensor. The controller stops working when its temperature
exceeds 85 °C and begins to working when its temperature is below 75 °C.
TVS HighVoltage
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.
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