I have a Multiplus II 8kva with 560Ah LFP battery, UK grid parallel ESS system using AC-In as the grid connection. It charges overnight and provides grid-parallel power during the day.
We recently had a power cut. The inverter was on, and the AC1-out was energised as I have one socket attached to it next to the inverter. However, no power was flowing through into AC-In to the house, which I believe is the correct behaviour when the grid is lost (anti-islanding).
I want to be able to restore power to the house, after disconnecting the grid in the event of an outage.
Should I be using the AC1 out, as the grid connection?
What stops the inverter from becoming an island, if I do it that way?