Let's analyze it from the general situation first:
1.Open the inverter and check if there are any small insects crawling in, causing the inverter mainboard to short-circuit. For example, in remote areas, especially in rural and mountainous areas, there are many insects, and the inverter needs to have heat dissipation holes to dissipate heat. Small insects can easily crawl in and cause the inverter to short-circuit.
2. Wrong operation, such as the positive and negative poles of the battery are connected in reverse. Our inverter connects the two ends of the battery, the positive pole is represented by red, and the negative pole is represented by black, but there are still some careless users who connect the positive pole of the battery to the negative pole of the inverter. In this case, the power board and control board of the inverter will be damaged.
3. Long-term high-power output. We generally recommend that the long-term output power should not exceed 80% of the inverter output power.
4. Lightning strikes during thunderstorms or sudden high-power input from the mains will cause damage to the inverter control board or power board. The most common is the burning of the mosfet tube on the power board.
5. There are too many dust or particles in the use site, such as a mine or a quarry. The inverter is required to be placed and operated in a constant temperature and as far away from dust as possible. Otherwise, dust and other factors will cause the inverter to short-circuit.
6. Too humid, water vapor is the number one enemy of the inverter.
7. Connect a large load to turn on the inverter. At the moment of turning on the inverter, the power board will be subjected to high voltage or high current shocks, which can easily burn the mosfet tube.
8. Before turning off the inverter, turn off the inverter without disconnecting the solar connection first. If you do this for a long time, not only the mppt board will be damaged, but the power board and control board will also be burned.
9. The battery has failed. When the off-grid inverter is working, it will continuously charge and discharge the battery. If the battery fails, the inverter will not work properly unless it is connected to the mains input.
To determine whether an inverter is damaged, you can first check whether the power board is damaged.
The steps are as follows:
First use a multimeter to detect whether the voltage at the battery end of the inverter is consistent with or roughly the same as the battery voltage, disconnect the mains input and solar input, and only keep the battery connection. After confirming that the battery has enough power, connect the load. If there is AC output, it proves that the inverter is not damaged; if there is no AC output, it proves that the power board is damaged. The user can open the inverter casing and observe whether the MOSFET of the power board is burned.
Then connect the mains to observe whether the battery is charged. If the battery can discharge and charge normally, then there is no problem with the inverter power board.
If everything works normally, but only the frame of the display screen has light, and the display screen can't display anything, then the control board of the inverter is damaged, usually caused by a short circuit or poor contact.
The inverter cannot charge the battery whether it is AC or PV: After checking the inverter power board according to the above method, observe whether the battery icon stops flashing, especially for lithium batteries. Now many lithium battery suppliers use used batteries to manufacture lithium battery cells in order to provide low-priced lithium batteries. This causes the actual capacity of the lithium battery to be less than its marked capacity. Often the inverter stops charging the lithium battery when it charges to about 40% or 70%. This is a lithium battery quality problem and has nothing to do with whether the inverter operates normally. Detection method: Try to charge with other batteries. If everything is normal, it proves that there is a problem with the quality of the lithium battery.
If we strictly follow the operating specifications after reading the instructions, most of the above problems can be avoided.
Xindun Power will explain and provide solutions based on the fault codes in the instructions. As shown below:
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Single-phase inverter fault detection |
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Error code |
Troubleshooting steps |
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A01：Over temperature protection |
1:(The temperature of the MOS tube heat sink is ≥55℃ and the fan is running) Check whether the fan is running normally |
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2:Check whether the temperature control line plug is loose or fallen off |
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3：Check if the temperature control is damaged |
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A02：Transformer primary connection reversed |
1：Check if the transformer secondary N L wire plug is loose or fallen off. |
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2：Check if the motherboard is damaged |
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A03：Storage data error |
Need to restart the machine |
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A04：Reference voltage abnormality |
Check if the motherboard is damaged |
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A05：Output short circuit |
1：Disconnect the load and test whether the machine runs normally without load. |
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2：Check if the motherboard is damaged |
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A06：Battery high voltage alarm |
1：Check if the battery connection is correct/test if the battery voltage is normal |
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2：Inverter integrated machine/external controller model: Check whether the controller is damaged |
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A07：Temperature probe failure |
1：Check whether the temperature control line plug is loose or fallen off |
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2：Check whether the temperature control probe is damaged. |
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A08：Communication with the controller is abnormal |
1：Check whether the communication line between the controller and the mainboard is loose or detached. |
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2：Check whether the solar controller/inverter mainboard is damaged |
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A11：Overload (load power ≥ 102% alarm) |
Need to reduce load |
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A12：Inverter fault |
1：Check if the battery connection is correct/test if the battery voltage is normal |
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2：Disconnect the load and test whether the machine runs normally without load. |
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3：Check if the transformer secondary N L wire plug is loose or fallen off. |
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4：Check if the motherboard is damaged |
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A13：Battery low voltage alarm |
1：Check if the battery connection is correct/test if the battery voltage is normal |
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2：The battery is low and needs to be charged. |
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A14：Battery low voltage protection |
1：Check if the battery connection is correct/test if the battery voltage is normal |
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2：The battery is low and needs to be charged. |
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A15：Mains high voltage alarm |
The mains input voltage needs to be reduced |
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A16：Battery high voltage protection |
1：Check if the battery connection is correct/test if the battery voltage is normal |
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2：Inverter integrated machine/external controller model: Check whether the controller is damaged |
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A17:Abnormal mains frequency |
Abnormal mains frequency |
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Three-phase inverter fault troubleshooting |
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Fault Codes |
Fault Codes |
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A31: Over temperature protection |
1: (heat sink temperature ≥ 55℃ fan running) Check whether the fan is running normally |
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2: Check if the temperature control line plug is loose/falling off |
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3: Check if the temperature control is damaged |
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A32: Battery low voltage alarm |
1: Check if the battery is connected correctly |
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2: The battery voltage is low and needs to be charged. |
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A33: Overload |
(Load exceeds rated power by 102% alarm) Load needs to be reduced |
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A34: Battery high voltage alarm |
1: Check if the battery is connected correctly |
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2: The battery is at high voltage and needs to be discharged |
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A35: Mains high voltage alarm |
(Mains power ≥ 275V), the mains input voltage needs to be reduced |
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A36: Mains power phase error/phase loss |
1: Check whether the voltage of N-A, N-B and N-C of AC input is normal. |
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2: Replace the A and B lines of the AC input |
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A42: Internal storage data error |
(Memory read data abnormality) Need to restart the machine |
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A46: Communication with controller is abnormal |
1: Check whether the communication line between the controller and the mainboard is loose or detached. |
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2: Check if the solar controller is damaged |
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A47: Output short circuit protection |
1: Disconnect the load and test whether the machine runs normally without load |
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2: Check if the motherboard is damaged |
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A48: Battery low voltage protection |
1: Check if the battery is connected correctly |
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2: The battery voltage is low and needs to be charged. |
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A49: Inverter fault |
1: Check whether the battery voltage is normal |
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2: Disconnect the load and test whether the machine runs normally without load |
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3: Check whether the transformer secondary NL line plug is loose or fallen off. |
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4: Check if the motherboard is damaged |
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A50: Battery high voltage protection |
1: Check if the battery is connected correctly |
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2：Battery high voltage, needs to be discharged |
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A51: A phase transformer is connected reversely |
1：Check if the primary (red, black) of phase A transformer is connected reversely |
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2: Check if the motherboard is damaged |
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A52: B phase transformer is connected reversely |
1: Check whether the primary (red, black) of phase B transformer is connected reversely |
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2: Check if the motherboard is damaged |
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A53: C phase transformer is connected reversely |
1: Check whether the primary (red, black) of phase C transformer is connected reversely |
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2: Check if the motherboard is damaged |
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A54: Reference voltage abnormality |
1: Check if the A, B, and C phase current sensor wires are loose or fallen off. |
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2: Check if the sensor is damaged |
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3：Check if the motherboard is damaged |
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