My situation
• Cerbo GX (firmware v3.63 large)
• 3x Multiplus-II 48V/5000/70-48 (firmware 2623556)
• 3x Voltsmile V10 RPC (firmware: v0.0)
• SolarEdge SE7K-BE0TEBNN4 on AC OUT1 (firmware 4.22.44 and ip-address: 192.168.2.32)
Related settings
The problem
Without battery the solar panels are switching off regulary, due to overvoltage problems in the neighbourhood. Adding a battery enables to save solar energy in the battery in overvoltage situations and deliver it back to the grid later. Unfortunately, solar panels are still switching off, even when battery is not fully loaded and/or grid is in no-overvolt situation.
Solution 1: adapting gridcode?
Try do adapt the gridcode ‘Europe’ is order to switch off AC IN before the solaredge pv is switched off. The Multiplus-II will deliver emergency power on AC OUT1, with a lower voltage (230V) and the Solaredge can continue/reconnect.
All attempts resulted in ‘pendling frequency behaviour’ as can be seen in:
(left part, min-max enabled in the widget)
However, disconnecting AC 1 by a switch, results in AC OUT1 going into ‘emergency power mode’, without even restarting the SolarEdge, but just continues directly after getting 3x 230V !!
(right part of picture above).
So, some difference exists in hardware/software disconnecting!
Solution 2: default gridcode?
Keep using the gridcode ‘Europe’, with default settings.
In this situation PV will switch off before Multiplus disconnects from the grid in overvoltage situations. In this case the batteries will be loaded by the grid. Price will be low, so instead of loading battery from own solar pannels, solarenergy from other people will be used to load the battery. In case overvoltage switches off PV and MP, battery can not be loaded.
Solution 3: solution as described by @JeroenSt
Following the answer as described in:
https://community.victronenergy.com/t/victron-multiplus-2-5000-gx-grid-overvoltage/16728
This solutions reduces the downtime of the solarpanels, as can be seen as follows (left part, until 13:15 hour).
However, playing around with the DESS settings:
– system → maximum import power: 2kW → 3kW
– battery → maximum charge power: 2kW → 3kW
it will work even better, because in case of disconnection of PV, will start loading the batteries from the grid and lowering the (internal) overvoltage. After that, PV is reconnected (right part, after 13:15 hour).
Solution 4: SunSpec as described by @mpvader
See topic: https://community.victronenergy.com/t/help-needed-sma-solar-edge-kostal-enphase-and-others/33869
In this case, the SolarEdge will be controlled by the Cerbo GX in stead of manually manipulating settings as described above. Trying to use this solutions is not working in my situation, because the option:
is missing!
May be this is related to the firmware updates from SolarEdge as described on Github in the following 2 topics:
My question
What would be the best solution for the problem described?
It looks like the SunSpec connection between Cerbo GX and SE7K is only monitoring/reading registers, but not writing in the register to control the SE7K?
