SunSynk 8kW - F24 - DC insulation impedance failure; F26 - The DC busbar is unbalanced; F29 - Parallel communication cable fault; F35

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F24 - DC insulation impedance failure

This error is caused by an earth fault on the solar panel, which means that the positive or negative solar

cable is touching the ground. This problem can be very dangerous.

To clear this fault, you will need to check each solar panel/array to isolate the fault.

F26 - The DC busbar is unbalanced

The inverter will report the F26 error when the hybrid is in split-phase mode, and the load of L1 and L2

are different, which will damage the IGBT.

F29 - Parallel communication cable fault

This error is a very common fault when connecting inverters in parallel. Basically, it means that the

communication cable is not working correctly. This problem can be caused by the wrong type of

communication cable, wrong connection on the communication cable plugs, poor quality cable, or an incorrect

setting on the inverter(s). Another cause can also be the in-line resistor is set incorrectly

If you experience this fault, I suggest you follow these steps:

1) Switch off all inverters and reset them.

2) Check if each inverter has the correct and same operating system.

3) Check if the models are all the same.

4) Replace the communication cable with shorter cables. If possible, ensure that the middle inverter is the

master and the other are slaves, which keeps the communication cable as short as possible.

5) Check if the port limiting resistors are set correctly.

6) Check if all your batteries are on the same bus bar.

F35 - No AC grid

This is a simple error that occurs when no AC grid is present, so there is no power coming into the system.

You need to find the fault in your AC supply.

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SunSynk 8kW - F24 - DC insulation impedance failure; F26 - The DC busbar is unbalanced; F29 - Parallel communication cable fault; F35 - No AC grid