I am logging INVENTORY.JSON to check the status of Micro-inverters in my system.

And, I found some flags are 'false' but  inverter is producing power while some flags are fail.

I am not sure the flag is correct, or wrong flag due to the noise.

Recently, some micro-inverters lost communcation with gateway, and, the lost flags are happening more frequenctly, and, the flag error is happening before lost communcation.

the lost communication is happening when the production level is higher than 220W mostly.

the communication is recovering when the production level is going under 200~220W.

farest inverter from the gateway is under 100ft,

and, only 6 inverters in a group,

the grid voltage is around 250V while lost communcation.

I have checked without any extra filter (such as ferrites) on the grid side and check the status in cloudy day,

and, I found so many flag error (but no communcation loss when production power is under 200W)

I have install 3 ferrites on L1, 2 ferrites on L2 on grid side, and monitor the status while cloudy day

no more flag error, so, it is an evidence my gateway is affected by an external noise.

Just problem is, the noise level is not high enough at the situation (Enphase PLC noise detection graph)

at the noisy environment, it is easy to reduce the noise signifcantly,

But, it is really hard to reduce the noise when quiet (under 50dBuV) environment.