We studied the manuals and spoke to our in country distributors in South Africa and we are getting conflicting messages and need to get to the bottom of this.
We in the process of implementing 2 x Quattro 48/15000 in parallel per phase i.e. 6 in total. Reading the manual it states that if the AC voltage on AC-in-1 or AC-in-2 is switched through, but the load demands more current than the mains can supply, the inverter will be switched on to supply additional current.
Which refers to the PowerAssist where the Quattro can together with a maximum input current of 100A + 65A from the inverter give us 165A (15kVA model) or in our case parallel connected Victrons, we will get 330 Amps per phase (2 x 100a AC Input + 2 x 65A Inverter).
What we can't get a definite answer on, is if this is just for a "rush-in" situation or can it be for a longer period, as we do have sometimes on this site more than a 200A requirement for periods of one hour.
The one solution is we can purchase another 3 Victrons, one per phase but for the short periods it will be in use it is not worth it.
Looking forward to your response.