I just got a call from the grid operator TEN here in Germany, and he see some problem with the AR-N 4105 2018-11 I send him for my installation. The system setup ist:
3 x Multiplus-II 5000 (only connected on AC-In)
1 x VenusGX
1 x EM24
1 x Pylontech Battery Stack (12 US3000 + LV-Hub)
1 x Fronius Symo 8.2-3-M
1 x Kostal Piko 8.3
I calculated for myself with 4000 VA for each MP-II as mentioned in the datasheet as "Maximum apparent feed-in power". So I come to a total of:
3 x 4000 VA + 8200 VA + 8300 VA = 28.500 VA which is < 30 kVA, and therefore no external Grid-Protection (NA-Schutz) is needed.
The grid operator now says, there are 2 Problems:
1. the output power as described in the AR-N 4105 2018-11 is specified as 4,85 kVA, which is to much for one phase. This confused me too, because in the same document there is a comment about a limit of 3 x 4,6 kVA = 13,8 kVA for all ESS - Systems.
2. the sum of power with this numbers is above 30 kVA, so he wants me to build up an external Grid-Protection.
Has anyone else experience with MP-II 5000 in german grid? When I read the certificate second time, I think MP-II 5000 are not covered by this document (Die maximale Anschlussleistung von 13,8 kVA (max 4,6 kVA pro Phase) darf nicht überschritten werden).