FAQ

Please check for any devices causing signal interference between the data acquisition and your phone.

Try entering the network name manually; it is made up of SINENG_S_ and the serial number of the data acquisition.

Analysis:

1. False alarms caused by inaccurate inverter detection.

2. DC side wiring problems.
   

   
   

Solutions:

1) It is basically a false alarm caused by inaccurate inverter detection, provide the serial number of the inverter, Sineng team will check the related setting.

2) Power off the DC and AC side of the inverter, wait for 10 minutes and reconnect the DC cable, make sure it is tightly connected, and then power on the inverter to check whether the fault disappears.

Analysis:

1. For SN series, if the phase sequence adaptive function is not turned on, and the three-phase sequence of the inverter's AC side is incorrect, this alarm will be reported.

2. For SP series, if the three-phase sequence of the inverter's AC side is incorrect, this alarm will be reported.
   

   
   

Solutions:

1) For SN series inverter, provide the serial number of the inverter, Sineng team will check whether the phase sequence adaptive function is enabled.If it is disabled, Sineng team will enable the function.

2) For SP series inverter, check whether the wiring sequence of three-phase on the inverter's AC side corresponds one to one.If not, power off both the DC and AC sides, and then adjust the three-phase wiring on the inverter's AC output side.

Analysis:

1. The self-checking value of the inverter output leakage is very close to the software setting value.

2. The inverter self-check circuit is abnormal.

Solutions:

1) If this fault occurs occasionally, it will not affect the normal operation of the inverter, and the inverter can self-recover and connect to the grid.

2) If the fault persists, provide the serial number of the inverter, Sineng team will confirm the self-checking value of the inverter output leakage current.If the current value is close to the software setting value, the software judgment value can be adjusted and the software can be updated then.

3) If Sineng team found that the current value is too large or too small, the hardware self-check circuit should be abnormal and the inverter needs to be replaced.

Analysis:

The software detects that the PV voltage is close to 0, the MPPT has a reverse current, causing this fault to be reported.

Solutions:

1) Check whether any PV strings are reverse-connected. You can also ask an electrician to use a current clamp to test the PV string current when the inverter is on standby mode.If it is higher than 3A, the corresponding PV string is reverse-connected.

2) For inverters with reverse-connected PV, the DC side and AC side must be powered off before replugging the PV string.

3) If the current clamp detects that there is no current in the PV string, but there is current in the monitoring platform, you can contact our Field Application Engineer to remove the upper cover and confirm whether the string current board cable is reliably connected.

4) If there's no PV string being connected reversely, check whether the number of PV panels connected to the PV strings under the same MPPT is consistent. If not, adjust the number of PV panels connected to the PV strings under the same MPPT to be the same.                     

Analysis:

MPPT input voltage is higher than 1000V.

Solutions:

1) Use a multimeter to check whether the PV voltage of each PV array is higher than or very close to 1000V. If so, reduce the number of PV panels according to the voltage you measured. In order to ensure efficient and stable operation of the system, it is recommended that the PV open circuit voltage be lower than 950V.

2) If the PV voltage measured is between 900-950V, provide the datasheet of your PV panel, Sineng team will decide whether you need to reduce 1 PV panel for the string whose voltage is between 900-950V(because PV panels have a negative temperature coefficient).

3) If the PV volatge measured is below 900V for all the PV strings, but the fault cannot be recovered, the DC voltage sampling of the inverter may be abnormal, provide the inverter serial number, generally, it should be replaced, but Sineng team will double check.                              

Analysis:

If the inverter temperature is higher than the over-temperature protection point, it will usually report a fault together with the temperature being seriously too high.

Solutions:

1) If the alarm persists and will not recover, it means that the internal temperature sampling of the inverter is abnormal and the inverter needs to be replaced.

2) If the inverter runs intermittently with the alarm, check whether there is a heat source around the inverter, provide the serial number of the inverter, Sineng team will update the inverter to the latest and check the temperature values.If it's still the same after updating and the temperature values are also abnormal, the inverter needs to be replaced.

3) If the inverter reports this alarm when it is turned on or the inverter radiator temperature is lower than the over-temperature protection point but reports this alarm, provide the serial number of the inverter, Sineng team will update the inverter to the latest and clear the alarm.