Hi, eicosan.
There may be two states in which there is a power consumption of 0.
1. You are using electricity that you produce yourself, without using electricity from the grid. So the power consumption is 0
2. If it is determined that the grid power is being used, it is likely that the meter has failed. You can provide the SN number of the device and ask for help from this mailbox.(eu_inverter_support@huawei.com)