"meters" message contains no data

[felixmartens]

I have two inverters (New HD Wave ones), a battery and a ModbusMeter installed. I can extract a useful "inverter" messages every once a while, but most of the time i recognize a "meter" message every 5min, which JSON Output only contains the correct Time/Data field and the rest of the fields are mostly zero, P2X is sometimes correctly read. Can someone point me to where i can start to debug the decoding so i can decrypt meaningful "meter" messages?

[jbuehl]

It looks like it is done in datadevices.py in class ParseDevice_0x0022 starting at line 441.

[felixmartens]

I found this too, but i am wondering how to find the right values at this point. It seems to me that the given "register"/offset etc isn't correct, but how should i best dissect the dump to get the right values. I already have compiled current Wireshark version including Solaredge plugin. I just don't know where to start.

[Geoff99]

Hi @felixmartens

I may be a bit late offering this suggestion, but if you wade through the explanations in README.ParseDevice.md you will find some hints about how you might (with a bit of tweaking of the code) get some (voluminous) debugging style output from ParseDevice itself, by putting it into "explorer" mode. That can be a bit helpful in figuring out

1. what is the correct format for a field at a particular offset, and then
2. what is the appropriate interpretation of the field.

Step 1) requires perseverance (because ParseDevice in explorer mode just reports almost every decoding of the field I could think of).

Step 2) requires detective work, comparing values from semonitor output against values from the inverter itself (or the SolarEdge website) from the same point in time.

The "meter" device (more precisely the 0x0022 message) is a pain to decode, because it there are multiple repeats of it for the same timepoint. A field (recType) early in any particular 0x0022 message instance signals what interpretation is appropriate for the subsequent fields (offsets) in that message. Depending on the recType, many of the fields appear to be unused (aka are always zero). There are also some fields that do contain non-zero data which I was unable to decode / decipher even after considerable effort.

You can access the internal documentation about what fields actually do hold useful data via a couple of commands in an interactive python session

from se.datadevices import ParseDevice
print ParseDevice.itemDefs()

(NB The code in semonitor has been substantially tidied up since README.ParseDevices.md was written. This import statement is the one to use (the example in the README.ParseDevices.md is out of date)

Sorry I can't help with Wireshark - I'm a novice user of it myself and have not managed to get the solaredge plugin to work for me yet.

Hope that helps a bit.

PS I have an older SE6000 inverter, it is quite possible that with newer inverters the field interpretations and formats have been changed :-(

[charlygolf]

for those trying to make sense of the 0x0022 messages my ideas about the meaning of the recTypes:

2: exported to the grid 3: consumption 4: imported from the grid 6: solar energy consumed on site (selfuse) 9: solar energy

My inverter outputs all these messages every 300sec, and has a consumption modbus meter attached. I am assuming you get other RecTypes with differently configured modbus meters.

Some obvious conclusions: 9 = 6 + 2 (whatever solar energy you don't use on site will be exported to the grid) 3 = 6 + 4 (all energy your site consumes is either solar or imported from the grid)

[Geoff99]

In case it helps other in the future, this is what ParseDevice_0x0022 currently (June 2018) knows about the 0x0022 messages (as seen from an SE6000 inverter). Just possibly (but I have no way of testing) these field definitions may help decipher the recTypes that are not currently recognised.

ParseDevice_0x0022 / meters_0x0022 parses data blocks with seType = 0x0022.
================================================================================
Items are:
Byte (Length)   Word   | Item Name                 
                        : Meaning

____ (______)   ______ | _________________________ 
                        : ________________________________________

0    (  4   )   0.0    | dateTime                  
                        : Seconds since epoch

4    (  1   )   1.0    | recType                   
                        : record Type, determines the interpretation of later fields
                        : 3=Consumption,
                        : 5=Grid Import/Export,
                        : 7=Battery,
                        : 8=Unknown, almost all 0,or very very small,
                        : 9=PV production

5    (  1   )   1.25   | onlyIntervalData          
                        : 1=only interval data has been reported, 0=lifetime data reported as well

6    (  4   )   1.5    | TotalE2Grid               
                        : Wh, Lifetime energy exported to grid (*provided* onlyIntervalData flag is not set)
                        : Wh. Total lifetime energy exported to grid when recType=5 (matches SE LCD panel value)
                        : always 0, when recType=3, or 7, or 8, or 9 because onlyIntervalData=1 (True)

10   (  2   )   2.5    | AlwaysZero_off10_int2     
                        : Padding

12   (  2   )   3.0    | Flag_off12_hex            
                        : Flag
                        : 0x0000->TotalE2Grid reported
                        : 0x0080->TotalE2Grid not reported

14   (  4   )   3.5    | TotalEfromGrid            
                        : Wh, Lifetime energy imported from grid (*provided* onlyIntervalData flag is not set)
                        : Wh. Total lifetime energy imported from grid when recType=5 (matches SE LCD panel value)
                        : always 0, when recType=3, or 7, or 8, or 9 because onlyIntervalData=1 (True)

18   (  2   )   4.5    | AlwaysZero_off18_int2     
                        : Padding

20   (  2   )   5.0    | Flag_off20_hex            
                        : Flag
                        : 0x0000->TotalEfromGrid reported
                        : 0x0080->TotalEfromGrid not reported

22   (  4   )   5.5    | Totaloff22_int4           
                        : Unknown, probably an energy field  (*provided* lifetime flag is set)
                        : Maybe a cumulative net value, it appears to decrease overnight when importing power
                        : Wh. Unknown when recType=5 (generally increasing trend, but falls overnight)
                        : always 0, when recType=3, or 7, or 8, or 9 because onlyIntervalData=1 (True)

26   (  2   )   6.5    | AlwaysZero_off26_int2     
                        : Padding

28   (  2   )   7.0    | Flag_off28_hex            
                        : Flag
                        : 0x0000->Totaloff22_int4 reported
                        : 0x0080->Totaloff22_int4 not reported

30   (  4   )   7.5    | Totaloff30_int4           
                        : Unknown total energy field (*provided* lifetime flag is set)
                        : monotonic increasing so far including overnight.
                        : Maybe something like cum total consumption scaled by about 60%?
                        : Wh. Unknown when recType=5 (steadily increasing trend)
                        : always 0, when recType=3, or 7, or 8, or 9 because onlyIntervalData=1 (True)

34   (  2   )   8.5    | AlwaysZero_off34_int2     
                        : Padding

36   (  2   )   9.0    | Flag_off36_hex            
                        : Flag
                        : 0x0000->Totaloff30_int4 reported
                        : 0x0080->Totaloff30_int4 not reported

38   (  4   )   9.5    | Interval                  
                        : Seconds, Time Interval

42   (  4   )   10.5   | E2X                       
                        : Wh, Energy to X during the interval
                        : always 0 when recType=3
                        : Wh. Energy exported to grid during interval when recType=5 (whenever TotalE2Grid is static, E2X=0)
                        : Wh. Energy into battery when recType=7 (matches battery(0x0030).EIn)
                        : Unknown, when recType=8 (almost always 0, very occasionally has small +ive value)
                        : Wh. PV energy production during interval when recType=9

46   (  4   )   11.5   | EfromX                    
                        : Wh, Energy in from X during interval 
                        : Wh. Consumption when recType=3
                        : Wh. Energy imported from grid during interval when recType=5 (whenever TotalEfromGrid is static, EfromX=0)
                        : always 0 when recType=7 (I expected E from battery but it does not match battery(0x0030).EOut)
                        : always 0 when recType=8 
                        : always 0 when recType=9

50   (  4   )   12.5   | P2X                       
                        : W, Power output to X
                        : always nan when recType=3
                        : W. Power to grid at end of interval when recType=5 (whenever TotalE2Grid is static, P2X=0)
                        : W. Power into battery when recType=7 (is nonzero when E2X is nonzero)
                        : almost always 0 when recType=8 
                        : W. PV power when recType=9

54   (  4   )   13.5   | PfromX                    
                        : W, Power input from X
                        : W. Consumption when recType=3
                        : W. Power from grid at end of interval when recType=5 (whenever TotalEfromGrid is static, PfromX=0)
                        : always nan when recType=7
                        : always nan when recType=8
                        : always nan when recType=9