We have 2 Multi 24/5000 in parallel. I´m getting many Error 5 alerts (and shutdowns). They last app. 30 sec and the system goes up again. They usually happen when the generator starts automatically. We are on the 3 to 7,5 kW consumption range.
At first, I checked the AC Out wires(4mm2) for having the same length (which they didn´t, made them same length -1m-) but did not solve the situation.