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Hi all, I'm designing a system with 2 inverters and one large battery, one of the inverters being a Fronius SYMO GEN24 10.0 Plus. The battery is connected to the GEN24 inverter, and the 2nd inverter is only acting as an extra AC power generator (AC coupling) to the main AC bus. One of the innovative features of the Fronius GEN24 is its ability to act both as a DC coupling (energy source is PV) and AC coupling (AC bus is source) simultaneously. This is key to our design, as the second inverter will provide for extra power to be injected into the battery, adding to GEN24's own PV DC coupling. For example if GEN24 PV is producing 4 kW and the other inverter is injecting 2 kW into the AC bus, the battery will get the 6 kW sum, minus the AC consumption of course. We're using PV*SOL 2020 (R5) and the Fronius GEN24 is supported, in fact it is even supported in conjunction with the battery we are using, so we thought the simulation was fine. Unfortunately upon running the simulation we got grid feed energy way too high for what we anticipated. Upon checking the csv simulation results we were shocked to realize there is energy exported to the grid even with a low battery SoC and coupling capacity available! PV*Sol is not doing battery AC coupling on the GEN24, all energy produced by the second inverter over the AC bus is being ignored the GEN24, so the production surplus over consumption is being fed to the grid instead of getting into the battery. Can you please provide proper behavior for this inverter in your simulations by adding simultaneous DC and AC coupling? Thanks in advance, -jprates

Hallo PVSol-Team, Berücksichtigt PVSol die DynamicPeak-Funktion der Fronius Wechselrichter in irgendeiner Weise? Was ich denke, was die DynamicPeak-Funktion ist: Sie testet alle 10 min den gesamten MPP-Spannungsbereich durch, um zu schauen ob es neben der (normalen) lokalen MPP-Spannung einen besseren Abreitspunkt für alle Solarzellen im String gibt. Falls sie einen findet, stellt sie die Spannung auf diesen "Globalen Maximum Power Point". Allgemein frage ich mich, ob man bei Fronius WR überhaupt Leistungsoptimierer einsetzen sollte und falls ja, ab was für einer Schattenäufigkeit pro Modul oder was für einem Verhältnis von verschatteten zu unverschatteten Modulen im String? Oder anders ausgedrückt, falls ja, ab welcher Verschattung dann Leistungsoptimierer einen besseren Arbeitspunkt finden als die DynamicPeak-Funktion. Vieln Dank für Anmerkungen und Kommentare vorab. Mit freundliche Grüßen Anton Knihs

Hi, I hope you can help me. I am trying to configure an east-west system, 778 JA Solar 270 W panels in total, 389 per side with Fronius ECO 27 inverters and I don't seem to be able to find the right string configuration. If I try to use the maximum number of strings, the MPP voltage too low and the current to high: Or if I try to reduce the number of strings, the open circuit voltage becomes too high: I have tried using different panels and number of panels per string or having a south-facing system, but nothing seems to work with this inverter. I seem to be in an impasse and any recommendation will be much appreciated! I am also attaching my design file for reference. Thanks for your help! Z Foxfield.EastWestV2.pvprj