@Nanna_Agesen
Can you provide the modbus registers for the TRI power inverters or a link? Its gettings nuts trying to find something at SMA homepage.
Sure - later this evening I’ll try to find it.
My installation has “summation måler”, and I’m looking for the SMA battery inverter 3.5 kwh.
Here is the Modbus documentation I used
Hello,
I tried to read the Modbus data from my Sunny Boy inverter 2.5-1VL40, but untill now I only receive a fixed value of -214748364 on address 30775.
Do I have to transform this value in Paper UI?
When I fill in readTransform=“JS(divide1000.js)” I receive a warning in my logfile.
What am I doing wrong ?
Thats because the value -214748364 cant be translated in the JS script…
I use a modified JS script for my Sunny Boy Storage 2.5 which handle this…
Look in this thread: [SOLVED] Convert an item negative value to 0 (zero)
Hello,
I tried many things, but get the modbus to start working. Only the actual power and total yield values I already discovered. The usual modbus adresses for the other fields didn’t work for me.
I created a rule to recover the daily yield out of the total yield, by storing the start every day.
First, and very important is the fact that my inverter only gives some good values when the sun is shining. For example, the actual value for the power is always the fixed value 214748364 when it’s dark outside. So when you are trying to get your scripts working, do it during the day when the inverter is active. At least for the actual powers etc…
To recover the actual power when the actual power=0, I used a javascript. When I receive a value too high for my maximum production I set the actual value==0.
Things:
Bridge modbus:tcp:inverter [ host="10.0.0.78", port=502, id=3 ] {
Bridge poller sma30529 [ start=30529, length=2, refresh=5000, type="input" ] {
Thing data Total_Yield [ readStart="30529", readValueType="uint32" ]
}
Bridge poller sma30775 [ start=30775, length=2, refresh=5000, type="input" ] {
Thing data Power [ readStart="30775", readValueType="uint32", readTransform="JS(sunpower.js)"]
}
}
Items:
Number Power "Actual Power [%.0f W]" { channel="modbus:data:inverter:sma30775:Power:number" }
Number Day_Yield "Day Yield [%.0f Wh]"
Number Total_Yield "Total Yield [%.0f Wh]" { channel="modbus:data:inverter:sma30529:Total_Yield:number" }
Number Day_Start "Day Start [%.0f Wh]"
Rules:
rule "Reset_Zonnepanelen_Dag"
when
Time cron "0 0 0 * * ?" // every day
then
var Number Zon=Total_Yield.state as DecimalType
Day_Start.postUpdate(Zon)
end
rule "Update Day_Yield"
when
Item Total_Yield received update
then
var Number Zon_Totaal=Total_Yield.state as DecimalType
if (Day_Start.state==NULL) { Day_Start.postUpdate(Zon_Totaal) }
var Number Zon_Start=Day_Start.state as DecimalType
Day_Yield.postUpdate(Zon_Totaal-Zon_Start)
end
sunpower.js
(function(i) {
power=parseFloat(i);
if (power>5000) {power=0;}
return power;
})(input)
I found a very interesting xls file with a lot of sma types and modbus adresses:
https://www.sma.de/fileadmin/content/landingpages/pl/FAQ/SunSpec_Modbus-TI-en-13.xlsx
Click on the second tab (below) and select your sma type.
Regards, Hans
Hi Hans,
Thanks to your example it works a little bit more.
Only the figures are still a constant value. Now divided by 1000.
When I change the ID of the bridge from 2 to 3 nothing changes.
Or do I have to reset ?
Kind regards,
Pieter
Hey Pieter,
While testing, sometimes it works after changing the scripts.
But it is always safe to do a reboot or
sudo systemctl restart openhab2.service
Your current reading for actual power is 2^31=2147483648 (no power).
Then your script should convert it to 0 (zero).
Regards, Hans
Thanks Hans,
A little bit further. No power reading on address 30775.
It’s quite dark today, but the actual reading according to the SunnyBoy webpage is 69W.
According to the SMA manual ID=2
I will check other addresses tonight
After several attempts, I still don’t receive data from my Sunny Boy Inverter.
The XLS-file shows different addresses like 40200 for actual Power. This address gives a result of -1
Meanwhile, I updated OpenHAB to version 2.5.1
Also tried to read other addresses like 30774 and 30776.
Did you look at SMA´s website?
You´ll need to find the specific list of registers for your device.
The best I could find right now online was this one… It will open a Excel document in where you can pick your device:
https://www.photovoltaikforum.com/core/attachment/13916-sma-modbus-ti-en-23-xlsx/
EDIT - Try read register 30053. If it read correctly, you should be reading value 9302 which means, its a “Sunny Boy 2.5”
1 Like
Great… Now all you need to do, is to put in the registers you want to read 
I understand. But when I add the register for actual power, an enormous number appears. something like 4 billion …
Look in the excel sheet I´d link to… Sometimes you need to read a different register to get the “right” power reading. It can be a bit of a pain to find the correct one to read… But a fast look at the sheet, I believe these are the ones you should be reading:
30775 Power W S32 FIX0 RO
30777 Power L1 W S32 FIX0 RO
30779 Power L2 W S32 FIX0 RO
30781 Power L3 W S32 FIX0 RO
Btw, the Excel sheet says nothing about the length of the numbers. Or is there a standard ?
I have added another register. Now I have those strange values again after an OpenHAB restart. I’m suspecting my SMA inverter.
They have to fit into Modbus 16-bit registers/words. Looks to me like this SMA generally uses two words e.g. 32-bit. That still leaves a choice of integer, signed, floating point formats. There’s no way to guess that and you must find out from maker’s docs.
If only we knew what registers you were looking at … need a bit to work with, here.