Protections, Troubleshooting & Maintenance; Protections; Troubleshooting - Offgridtec MPPT Pro Duo Bedienungsanleitung

4.Protections, Troubleshooting & Maintenance

4.1Protections

PV Over Current/Power
PV Short Circuit
PV Reverse Polarity
Night Reverse Charging
BATT1 and BATT2 Reverse
Polarity
BATT1 Over Voltage
BATT1 Over Discharge
BATT1 Overheating
BATT1Low
Temperature(Lithium
Battery)
Controller Overheating
TVSHigh Voltage
Transients

4.2 Troubleshooting

Faults phenomenon
Charging LED indicator off during
daytime when sunshine falls on
PV modules properly
Wire connection is correct,the
controller is not working.
red on solid
Red fast flashing
①System alarm a voltage fault
②System alarm an over
when using Lead-acid battery
discharge fault when the BATT1
③System alarm an over-voltage
is 12V but set as 24V
fault when BATT1 set as 12V and
BATT2 set as 24V
Allgemeine Informationen
Offgridtec GmbH
Landshuter Str. 141 – 143
84307 Eggenfelden
WEEE-Reg.-Nr. DE37551136
Offgridtec MPPT Pro Duo
When the charging current or power of the PV array exceeds the controller's rated current
or power, it will be changed at the rated current or power.
When not in the PV charging state, the controller will not be damaged in case of a short-
circuiting in 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 polarity is corrected.
NOTE: If the PV array is reversely connected to the controller,1.5 times rated
controller power(watts)from the PV array, will damage the controller.
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.
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 overvoltage disconnect voltage, it will automatically
stop battery charging to prevent battery damage caused by over-charging.
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.)
sensor.The controller stops working when its temperature exceeds 65 °C and restart to
The controller can detect the battery temperature through an external temperature
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), the controller will stop charging and
controller will be working automatically (The LTPT is 0 °C by default and can be set
discharging automatically. When the detected temperature is higher than the LTPT, the
within the range of 10 ~ -40 °C).
working when its temperature exceeds 85 °C and restart to work when its temperature
The controller is able to detect the temperature inside the battery. The controller stops
is below 75 °C.
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.
Possible reasons
PV array disconnection
Battery voltage is lower
than 8.5V
BATT1over discharged
BATT1 Overheating
Incorrect wiring steps.
Kontaktinformation
Tel: 08721-7786187
Email: info@offgridtec.com
Web: www.offgridtec.com
GFR: Christian & Martin Krannich
Troubleshooting
Confirm that PV wire connections are correct and
tight.
Please check the voltage of the battery. At least 8.5V
voltage to activate the controller.
When the battery voltage is restored to or above
LVR(low voltage reconnect voltage), the load will
recover
The controller will automatically turn the system off.
When the temperature declines to be below 55 ºC,
the controller will resume.
①Disconnect the system, and reconnect the BATT2
②③Please set the system voltage on the controller
first, then BATT1
to match the BATT1 voltage.
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