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I am aware that there is a 1 to 1 rule for a Fronius AC couple, I understand that you shouldn't put a larger Fronius than Victron, but can I put a smaller Fronius than the Victron. I have a 15KVA Victron system and I would like to add a 5KVA Fronius as the AC Couple connected to the AC1 output. Would this be a problem as you don't get a 15KVA single phase Fronius and the roof space I have for the panels for the Fronius is not large, it can take 12~18 535watt panels
No problem with the smaller Fronius inverter. The 1:1 rule gives you the MAX solar inverter size - the Victron inverter needs to be able to absorb the total output from the solar inverter, in the case where there are no other ac loads.
No problem with smaller Fronius, but do not forget to load PV inverter assistant (or ESS assistant) for frequency shift control of Fronius by Victron charger.
