Norwegian grid code compliance for MultiPlus-II grid-backup

DIY
,
1

Presently I’m preparing a MultiPlus-II for a grid-backup application (single phase, 230 V), in combination with battery and solar PV. The MultiPlus-II is intended to never feed back to the grid. All solar production will be used locally (on the DC side or AC side downstream of the MultiPlus-II). I would be very thankful if anyone can answer the following questions regarding how to ensure Norwegian grid code compliance?

  1. Is there already an applicable “Country / grid code standard” for Norway (or for example a general European setting) to select during MultiPlus-II setup?
  2. Does the MultiPlus-II fulfill an applicable standard to prevent feeding back to the grid in case of a grid power outage (I need to specify this for the grid owner)?
  3. Is any external device (for example from Ziehl) needed?
2

If you’re not exporting electricity, the grid code doesn’t apply to you. And yes, there’s the European standard EN50549-1.

Yes, the LOM function is there.

No, in your case, it’s not needed.

3

Thank you Diessel for your reply!

Regarding the second point, I would probably need to specify if the LOM function fulfills a certain standard. Could that be EN 50549? I found “Certificate ESS EN 50549-1 MultiPlus-II (GX) 3k & 5k”, where it says “Automatic disconnection with single fault tolerance is provided” and that it has been tested according to EN 50549-10:2022.

Regarding the third point, it makes sense what you write, but Victron’s manual “MultiPlus-II External Transfer Switch application” (https://www.victronenergy.com/upload/documents/MultiPlus-II_External_Transfer_Switch_application/179843-MultiPlus-II_external_transfer_switch_application-pdf-en.pdf) states in the table in section 1.4 that for Europe EN50549-1:2019, Ziehl relay UFR1001E required. Could that be only for systems with multiple inverters (as shown in the illustrations there)?

4

External transfer switch required for parallel operation of models above 8kVA

5

Thank you again. In the meantime, I have also received a reply by e-mail from Victron. As I interpret it, the LOM function fulfills EN 50549-1:2019 and has been tested according to EN 50549-10:2022, as I wrote before.

6

All certificates of conformity to various standards for Victron products are publicly available.

Just read the product descriptions carefully.

7

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