In this Victron application note , it is suggested to interconnect the Multiplus II and SolarEdge direct using the Multiplus K1 to put the SolarEdge into Alternative Power Source (APS). I think it was true before. However, now Multiplus II does not have a real relay but it has an open collector tran…

Hi @moacir , I am facing the same question. And further I am not sure how to configure the aux relay in VEconfig correctly. Help on these topics would be appreciated. :wink: Sebastian

I have used a optocoupler but I did not test it yet. I have used the open collector relay K1 on Multiplus so to signal, as fast as I could, that the inverter should move into APS. However, if you put some thought on it, it just doesn’t make sense. The SolarEdge always be on the AC OUT and, if so, w…

This thread is also being discussed here .

Hi Guys, I had the same issue and the application note is only valid for older Multiplus where K1 was a relay, but e.g. with the Multiplus2 you cannot use K1 so easily due to the OpenCollector contact implementation. I asked Solaredge for the electrical spec of the PRI but they forwarded me the sal…

Hi guys, Totally agree with you! I did this to solve the Victron MP2 K1 relais potential interconnection problem Ordered these 6 small interface 12VDC relais at Amazon: https://www.amazon.nl/dp/B0D8NCQYR4?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1 For €11,+ it’s cheap imho, good enough quality for s…

Have you tried this on the Cerbo GX? The Cerbo has two relays. I guess you don’t need this board anymore?

That’s a new feature isn’t it? But i still want to use the MP2 (K1) inverted relais function

If I were you I would try to integrate via SunSpec. Read this thread. [image] Cerbo GX to show SolarEdge info via Sunspec Modifications No! I gave up on both, collecting the SolarEdge info from Victron and asking questions in this forum. This is something you …

Sunspec will be controlled by the TSO/DSO ! Or you have to be able to write the specific control parameters based on your local grid voltage?

The SolarEdge APS mode, that we use to force using a relay, is only necessary if the grid goes down and your batteries are full charged. In this case, the Multiplus would have no place to put the generated solar power so it will increase its micro-grid frequency to force the SolarEdge reduce its pro…

Multiplus II with SolarEdge integration application note may cause damage

DIY

moacir (Moacir) 26 March 2026 22:42 9

If I were you I would try to integrate via SunSpec. Read this thread.

Topic		Replies	Views
ESS integrating with SolarEdge - Questions DIY beginner , ess , solaredge , multiplus-ii , 3-phase	23	1448	19 April 2025
Multiplus II and SolarEdge integration DIY beginner , multiplus , domestic	5	838	5 March 2025
ESS best practices integration DIY beginner , ess , energy_meter	2	239	28 January 2025
Multiplus+Multi RS Solar Q&A and troubleshooting diy , parallel , ess , multiplus-ii , multi_rs , cerbo_gx	13	804	30 June 2026
Connecting Solaredge inverter to MultiplusII GX via RS 485 Modbus DIY diy , ess , solaredge , multiplus-ii	6	538	5 June 2025

Multiplus II with SolarEdge integration application note may cause damage

Related topics