[Feature request] Add SMA Sunny Boy Storage 2.5 support

[emhal]

First of all thank you to all contributors of this project! Battery Emulator is awesome!

I was not able to get the SMA SBS 2.5 to work with Battery Emulator. None of the SMA BYD protocols was working.
The history can be found here (even though the discussion started with another topic): #1599

After some research I found out that the SBS 2.5 expects different CAN messages from a BYD battery than it's bigger brothers SBS 3.7, 5.0 and 6.0. Fortunately dala had some CAN logs of a setup with a SBS 2.5 with a real BYD battery: https://github.com/dalathegreat/byd-h-sma-can
When checking those I found out that the SBS 2.5 expects the battery identifying CAN messages like 558 not only once after the pairing command but constantly. Therefore I changed the code accordingly and got it working.

My implementation is probably not perfect and seems to send CAN messages too frequently (all 13 BYD messages each 100ms) but it is working flawlessly for more than one month now. Therefore I'd like to contribute that piece of code to the project. From one of the last release notes I noticed that InverterProtocolType 13 should be available now and could be used as "SMA-SBS2.5-BYD-HVS-CAN" like mentioned here:
#1912 (comment)
#1959 (comment)

I have the files SMA-SBS2.5-BYD-HVS-CAN.h and SMA-SBS2.5-BYD-HVS-CAN.cpp where can I upload them and who could implement them to the project? Also maybe somebody could further optimize the code? I'd also contribute it by myself to the project and add it as a feature branch with modified files InverterProtocol.h‎ INVERTERS.h and INVERTERS.cpp‎ to make that additional Inverter protocol available but I don't know how to get a contributor of this project.

From what I know besides me there is also @Simply-Johann with the same inverter that can test any new version supporting that new inverter protocol. He already successfully tested a precompiled version from me with this inverter protocol implemented based on the BE release 9.3.5

Thanks a lot in advance!

BR
Frank

Edit: I just realized I can upload the files as a zip archive, so I added them: Archiv.zip
There they are still named as the standard SMA BYD HVS files as that was the way I implemented it to test.

[Simply-Johann]

Many thanks to Frank!
Yes, I initially had a lot of trouble with the "difficult" SMA SBS2.5 – that's true. But with your inverter protocol based on the BE-9.3.5, the SMA SBS2.5 has become very easy to use.
Right now, I'm testing fix #2003 from Dala, based on the BE-10.0.RC4 – I even replaced the LiLyGo T_2CAN for it! (my Think City Battery is also brand new to this wonderful project).
And, I also need the SUN to test both – your inverter protocol and Dala's battery protocol – I'm quite confused at the moment...
To be precise – I NEED Your inverter protocol to even keep the inverter running! Thanks again, I'll report back.

[emhal]

I've just implemented the inverter protocol as "SMA SBS 2.5 compatible BYD Battery-Box HVS" in a just downloaded main branch of BE. Attached a zip file with all modified files and a update file for the Lilygo T2CAN. It is working fine as already with 9.3.5 but now on a BE version 10 base.

@Simply-Johann the attached update file should also include dalas latest Think battery bugfix. You can update from a version 10 and after the update you will be able to choose the new "SMA SBS 2.5 compatible BYD Battery-Box HVS" as inverter for testing.

BE_issue2012.zip

[Venne150]

Ich habe die Lily T2Can auf Version 10 RC4 aktualisiert, allerdings bei der Auswahl der Batterie ist nicht das Protokoll SMA SBS 2.5 zu finden, muss ich nun in einen weiteren Schritt obiges Protokoll hinzufügen ? Aber wie wird das gemacht ?

[emhal]

Nach dem Update auf 10.0 RC4 mein firmware.bin aus dem Zip File per OTA installieren

[Venne150]

Vielen Dank emhal. Es hat alles geklappt.
Nun noch eine weitere Frage zu der Kabel Verbindung SMA Inverter zum Lilygo T-2CAN, da reicht es ja nicht einfach Canh und Can L zu verbinden. Der Wechselrichter benötigt ja die Enable Leitung. Also zusätzlich eine automatische Schützsteuerung über GPIO. Ich habe bei der Anleitung gelesen, das dieses Signal für die LilygoTCan485 die Spannung von 12 V auf 3,3 Volt reduzieren muss. Wie ist das denn nun mit der LilygoT-2Can, muss ich da auch die Spannung reduzieren und wie und wo muss ich diese Enable Leitung anschliessen ?

[Simply-Johann]

@emhal Your 10.0.RC4 Version works perfectly. I only need to adjust the minimum cell voltage (to 2.6 V) and the maximum (to 4.1 V) at Daniel. Otherwise, the emulator complains too early that the cell voltage is too low. Thank You!

@Venne150
Ja, Du brauchst beim LiLyGo T_2CAN auch einen Spannungsteiler, er wird an BE IO46 angeschlossen (als Input).
Die Battery Kontaktore werden über SSR-Relays gesteuert, und die SSRs werden direkt über BE-Outputs gesteuert.
Weil ich nur 2 Kontaktore brauche (Precharge und Main) ist es bei mir so realisiert:
(der Minus für SSRs kommt aus -12V. Dieser Minus ist auch mit der Inverter-Masse verbunden)