With a Multiplus inverter charger installed in a “whole house” setup it is simple. By whole house set up, I mean the inverter powers all circuits in the RV. Simply set the Multiplus to Charger Only instead of On when you are plugged into shore power (30 amp or 50 amp pedestals) where power assist isn’t needed. Charger Only will pass the shore power through and keep the batteries charged, but it won’t invert if the shore power goes away. This way, you will know the power at the pedestal was lost and you can take the appropriate action. In other words turn the inverter on and manage loads accordingly until shore power is restored.