Finally I've got it working. Don't ask me how, because I changed and rechanged so much in the inverter that it is for me impossible to point out wich change was the right one. Me myself thinks that the firmware upgrade in both systems did the trick. I have both installed yesterday evening and this morning I sow the readings in Domoticz.
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Serienummer: 1930052074
Firmwareversie: 3.10.7.R