Once the normal light switches on (green), you have made sure the BMS is communicating with the inverter, now you switch on the AC power. (this is a very important step)
If you adjusted the grid the red fault light could switch on and a fault code will appear, it doesnt mean there is a fault it could just be because you adjusted the setting after the normal light switched on.
What you should see is the battery needle on the display should be indicating that the battery is charging by the amount you set under battery charge. If the battery doesnt start charging there is a problem, its doent mean the battery or inverter is faulty, it could just be a setting which is not correct.
Check all the settings again, especially your grid settings.
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