If I have 3x Multiplus in a three-phase system, the factor 1: 0 rule I calculate 3x5000VA = 15000VA = max inverter power is 15000Wp?

Or for one Muliplus has 5000VA so max power is 5000Wp?

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Max inverting power is 5000VA per phase. If you have 10kVa load on one phase it will show an overload on that one phase.

You will have a total of 15kVa inverting power, so that figure is what you use for battery bank sizing.

Beware that watts and kva are not the same thing. And power factor can affect the output and overload warnings as well.

The factor of 1:1 is for AC PV inverters. So in your case one that fies 5000VA per phase.

Your battery bank needs to be able to support at least a 312.5A continuous rating (not peak) absolute minimum.

Most compatible batteries have a victron associated webpage so will give minimum sizing there for the system you are looking at.

AC-coupled PV with Fronius PV Inverters live docs

Fronius Webinar: Fronius & Victron Energy: Easy system set-up

Fronius Advanced Webinar: AC Coupling with Fronius & Victron (AFR)

Fronius Webinar: Smart rural electrification with Fronius and Victron Energy

Parallel, split- and three phase VE.Bus systems manual

Theory on wiring large systems PDF

Three-phase and parallel system theory training presentation

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