What needs to be checked when the communication between the inverter and the lithium battery fails and 20 is reported?
1. First confirm whether the battery communication protocol matches the machine, if not, only US2 mode can be used.

2. Second, check whether the wiring is correct, refer to the user manual.

3. Finally, check whether the 05 agreements are selected correctly.

4. If 20 faults occur after the machine has been used for a period of time, it is necessary to check whether the wire or the terminal block is oxidized and causes poor contact, and you can try to unplug it again. It may be that the communication board is damaged, and it needs to be confirmed by replacement.

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