There are a few scenarios that I believe that systems should continue to work when they don't when a component disconnects.
Examples:
1. BMS comms is connected and then stops working for some reason (comms loss etc) - solar production completely stops. Surely the fallback settings on the MPPT should ensure that solar production continues and an alarm should be triggered?
2. Energy meter is connected and stops working for some reason (comms loss etc) the system then goes into passthru and solar production continues. The ideal scenario is that system continues to produce solar, metering is reverted to the inverter and alarm is triggered.
There are some more scenarios that are similar to the above where there should be some fallback logic to ensure systems keep working (ESS) but alarms are rather triggered than stopping certain functions.