2 × GVFX3524. I ordered the 10.3, got a fairly good price for a new one.
Right now with my Hub4 my two inverters are "classic stacked", with one designated as master and the other as slave (p. 24 of the GVFX manual, "Stacking Instructions"). Between them they power a 240VAC well pump, plus each has independent 120VAC loads - a sump pump, fridge, oil-fired hot water heater, hydronic heating pumps, etc.
From the Hub10.3 manual (p. 40) you referenced Jorge, it looks like I should set up my inverters for "Series stacking". Is that possible with my inverters, or should I just stick with the arrangement I have now? Or is it the same thing?