I have a simple installation whose sole purpose is to provide backup power in the event of grid failure (loadshedding in South Africa). It consists of a Quattro, Freedom Won Lite battery, Cerbo GX and a 3500KvA generator (installed on AC input 1 of Quattro). All loads are essential loads, so nothing connected to AC output 2 of Quattro. When grid fails the idea is for batteries to carry load until batteries are at 30% SOC and then manually start generator until batteries back to 100% SOC or grid returns. Since it is a small generator am relying on Power Assist in the event that there are load spikes when generator is in use. What are the advantages and disadvantages of using ESS in this installation, especially since PowerAssist may be required at times?