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Based on the experience, if it happens frequently, DC-DC circuit on mainboard or control board has some
issues. The reason is complex, research dep. Is analyzing it. When meeting these faulty ones, you can
report them to research dep. and assist them to analyze it further.
6 09 fault
Testing method:
a. Just connect battery into the inverter. Don’t connect Utility input and PV input into the inverter.
b. If the inverter still shows “09 Error” , check MPPT board firstly, you can put MPPT board into normal
inverter and confirm if it is ok.
c. If MPPT board is ok, you can replace mainboard directly.
Malfunction Reason:
a. Mosfets or Diodes on MPPT board may be damaged.
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