[Request] Set grid over-voltage limit

[hbarthel]

Is your feature request related to a problem? Please describe.

As the grid AC voltage may be 230V +/- 23V my HM-600 detects over voltage sometimes and goes to 0 Watt. For Germany the default seems to be 253V. To get back to 600 Watts it takes about 12 minutes.

Describe the solution you'd like

I know the grid type can be changed with the official DTU to increase the cut-off voltage to 255V. May be you can find out how this works and can be implemented in OpenDTU.

Describe alternatives you've considered

1. Maybe a surge protection plug could help
2. Complain about high voltage at grid carrier :)
3. Use a different phase

But I think the little too high voltage at the Hoymiles can also be caused by my house-installation.

Additional context

No response

[Solarteur]

OpenDTU is a tool to read data from Hoymiles HM-xxx inverters.
If you already suspect that your electrical installation is the reason for the (actually very) high voltages in the grid at home, check the installation or have the installation checked.

[hbarthel]

Well... guess it can also write, e.g. set inverter power. I'll see what the experts say...

[homeautomation2022]

Unsere Hoymiles kommen mit der Voreinstellung: https://github.com/lumapu/ahoy/wiki/Protocol#file-name-de_vde4105_2018
Ändern kann das derzeit nur die originale DTU und wird auch zeitnah kein Feature dafür kommen. Ist auch unnötig, denn die Landesvorgaben sollten auch eingehalten werden. Eventuell ist es auch ein HM aus einem anderen Land, dann gelten andere Regeln, die allgemeinen EU Stromnetzbestimmungen sind natürlich die gleichen.

Achso und was noch wichtiger ist, dein Leitungsquerschitt oder Übergangswiderstände sind dein Problem, da wird zu viel Leistung verbraten, weshalb die Schutzfunktion des Hoymiles greift. Ich glaube nicht, dass dein Stromversorger wirklich für längere Zeit 240V+ auf der Leitung hat!

[hbarthel]

Nach dem Dokument dürfte er erst bei 287.5V abschalten bzw. bei 253V Durchschnitt in 10 Minuten. Das ist bei meinem leider nicht so und daher vermute ich, hat er ein falsches GridProfile. Hab ihn von www.gartenkraftwerke.de

Mal Messung vom Hoymiles mit OpenDTU -> MQTT -> HA (27.03.2023 war hier ein Tag mit Sonne an / Sonne aus):

Schön passend dazu sieht man hier wenn er auf 0 geht genau wenn die Spannung kurz über 253V ist:

Habe gestern (28.03.2023) mal eine andere Phase probiert, die Spannung dort sieht deutlich "hübscher" aus und da hat der HM-600 bisher nicht mehr abgeschaltet bei ähnlichem Wetter. Mir würde erstmal helfen, wenn ich rausfinden könnte, welches Grid-Profile aktiv ist.

Mein Haus ist von 2004, damals gab's schon ordentliche Kabel. Daher würde ich Installationsprobleme ausschließen. Aber um ganz sicher zu sein, kommt bald der Elektriker und baut mir einen Shelly 3EM ein, dann bin ich (noch) schlauer :)

Um mich rum sind etliche PV-Anlagen, eine Fleischerei, eine mechanische Werkstatt mit zig Maschinen, manchmal flackert das Licht.

[mmz06]

Hi there,
Please accept my apologies as I interfere here and therefore, I'm just a user, not a developper, so it's a pure coincidence I met this topic of interest.
According to this online document from HM, it seems the default profile configuration limits the maximum Voltage to 253V instead of 287.5V as mentioned by @homeautomation2022.
This may explain the behaviour seen by @hbarthel.
Now according to the same doc, it seems you need to access "Hoymiles Monitoring Platform", through an official HM DTU to be able to do this change by yourself...

[robbe-23]

I'd also love to know which grid profile is installed. I have two HM300 which have their power factor (I think Germans would call this cos phi ?) locked at 1.0 resulting in a var of basically zero whereas my three HM1200 vary a bit, but still keeping close to 1.0 with a var of below 20. Is there a way to check this without using Hoymiles' DTU-Pro?

[robbe-23]

I can confirm that none of my HM300/1200 had a grid profile installed. I used the cheapest original DTU (€40,- at Shinetech, including an installer account) and after ages of fiddling around in the terrible App / Web-Interface, dealing with the limitations of the cheap DTU (only one inverter allowed), I managed to upload the required grid profile.

Happily back to OpenDTU the only notable difference is that now all inverters' power factor seem locked at 1,000, not only the two HM300, while var remained close to 20 in the three HM1200, all reading taken during maxed out production.

Regarding the OP - I remember that strangely the upper voltage limit in the grid profile (which you can even edit) was above 280V.

[bromic1]

Hi @robbe-23 , can you pls reconfirm that you used the DTU WLite for that? When I want to order at Shinetech they state me that the WLite is only for monitoring not for setting anything. I am also struggeling with grid overvoltage.
Thank you.

[robbe-23]

yes, it worked just fine (see screenshot above). The only difficulty was that the WLite can only be used to configure one inverter, and I have five.

[stefan123t]

@hbarthel the Feature Request has been described in #900 specifically detailled here.

There the Feature Request is to set a known Grid Profile and send it to the inverter.
A second Step would be, to allow changing the values in a Grid Profile within the allowed Ranges, in order to modify the Grid Profile individually.

[robbe-23]

Hi @robbe-23 , can you pls reconfirm that you used the DTU WLite for that? [...]

Yes, I also got mine from Shinetech. The difficulty was that I could only connect one HM at a time. Other than that, no problem setting the grid profile. Actually, I have never touched the WLite again after that, so it is has been resting for a year. If there have been any changes since I am not aware of them.