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1. Please confirm the battery type, lead acid battery or lithium-ion battery
2. If lead acid battery, please test the real battery voltage via multimeter. Too low battery voltage will
cause this.
3. If lithium-ion battery, confirm if battery brand can communicate with inverter, if yes, it may be caused
by abnormal communication.So check communication between inverter and battery. Most of time,04
warning is caused by communication issue. If no, try to set US2 on 5
th
option, less than 30A on 2
nd
option.
4. If you can exclude above all and 04 warning still can’t be cleared. You should doubt if it is caused by
broken sample circuit on mainboard or control board.
Solution:
Based on the experience, most of time, it is caused by lithium-ion battery communication issue. So try to
solve communication issue firstly.
Besides, if you figure out all possibilities based on testing method, try to replace mainboard or control
board.
Malfunction Reason:
Abnormal communication or too low battery voltage or abnormal sample circuit
5 20 warning
20 warning means BMS communication error.
Solution:
Based on the experience, most of time, it is caused by lithium-ion battery communication issue. So try to
solve communication issue firstly.
Malfunction Reason:
Abnormal communication often causes the warning.
6 07 warning
07warning means over load time out.
Testing method:
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