I've purchased a MultiPlus II GX because I've read about the UPS feature everywhere and it sounded like the ideal part for my application.
I've the standard setup with AC coupled PV and critical loads on the AC OUT 1 side, no dedicated meter on the input, Pylontech battery. The critical loads right now only draw about 4W in case that matters.
Out of the box, I can activate "UPS Feature" in the VEConfigure. Once mains is lost, critical loads are supplied from battery and even solar charging works. So far so good.
Problem 1: As soon as I enter a grid code (e.g. for Germany), the UPS feature disappears as a checkbox.
Question: Does that mean that the UPS feature only works when operating in non-compliant mode? If so, why is nobody talking about this anywhere? Why does the documentation seem to be completely silent about this? I understand that grid code is only needed for feeding back but the ESS assistant requires to set a grid code.
Problem 2: As soon as I activate the ESS assistant (with grid code set to "other non-compliant" and "UPS feature" checked), it simply does not perform any UPS function. It seems ESS deactivates UPS.
This seems to contradict what I've read in many postings but simply, things do not seem to work as described. What's going on? See last answer!
How can I set up a MultiPlus II with ESS and UPS feature for critical loads?
It feels like I've followed all the steps but it simply does not work.
Problem 3: How do I activate ESS mode 2 or 3?
Problem 4: I can read lots of values via Modbus TCP. When I try to write register 22 (active input current limit), the write is acknowledged with SUCCESS but the value simply discarded and it jumps back to the 25A set via the VEConfigure. Why?
Problem 5: Via VEConfigure, I can enable/disable the charger. How can this be done via Modbus/TCP or any other network?