When adding a new inverter to the site you will need to adjust the following:

On the EPM's display
- Adjust the number of inverters  -> Main menu Advanced setting (0010) ->Inverter Qty. Set
- Set the new export limit -> Main menu Advanced setting (0010) -> Backflow power
On the inverter's display 
- Change address on new inverter -> Main menu -> Settings -> Set Address 
- Enable EPM control-> Advanced setting ->External EPM set->other EPM (if the EPM is a 2G version) OR EPM5G (if the EPM is 5G version)
- Enable Failsafe function -> Advanced setting ->External EPM set->FailSafe ON