Request to copy your code

[AdyRock]

Hi,

Would you mind if I copy your code and convert it to Node.js for use with Homey?

And to be really cheeky, could you provide a typical request packet for a dummy sn, etc, so I can compare the output from my code to ensure I have got things right?

[StephanJoubert]

Hi @AdyRock , no problem. I wanted to do Node.js as well, but too much stuff on my plate as usual. Will see if I can get hold of some sequences for you.

[AdyRock]

Thank you, much appreciated. How do you get the MODBUS register information for various inverters? I have a Sofar HYD 3600-ES so not sure if the description files in your repo will work for me.

[AdyRock]

I have had some success. My inverter has a different register layout, so I have made a new description file and I now get valid data back most of the time. However, I find occasionally the data is crazy and it seem that the response has the wrong number of bytes. The Solarman V5 packets are perfectly formed with the correct check sum, etc, but the MODBUS payload is fragmented within it, so the first V5 data packet returns the start of the MODBUS registers and then, after the next request, I get a second V5 packet with the remaining MODUS registers. As the code doesn't verify the MODBUS CRC, the result is it decodes the values incorrectly.

Edit: also, I don't receive the second packet until I send a new request, so do you know if there is meant to be any acknowledgment that a packet has been received that might trigger the remaining data to be sent?

Have you seen anything like this?

[StephanJoubert]

I have not seen that behavior exactly, but found that when the registers has a gap, it works better if the request is split into multiple requests, with each one requesting contiguous registers.

[AdyRock]

Yep, I have done that. Maybe I will reduce the block size as my first block goes from 512 to 547, which, in theory, all contain valid data.

[igieon]

@AdyRock i think modbus protocol (registers) is same as in my inverter only that is single phase so your interval is not same as me https://github.com/StephanJoubert/home_assistant_solarman/blob/main/custom_components/solarman/inverter_definitions/sofar_g3hyd.yaml. And when i look into your range 0x512-0x547 its outside of values so probably look into this file and mask which is correct register adress. I think file is correct https://www.facebook.com/groups/2477195449252168/permalink/2895353217436387/.

[AdyRock]

Ah, sorry, the register numbers I gave are in decimal (JSON can't cope with hex), so the a

Name	Decimal reg	Hex reg
Running state	512	200
Fault message 1	513	201
Fault message 2	514	202
Fault message 3	515	203
Fault message 4	516	204
Fault message 5	517	205
Grid A Voltage	518	206
Grid A Current	519	207
Grid B Voltage	520	208
Grid B Current	521	209
Grid C Voltage	522	20A
Grid C Current	523	20B
Grid Frequency	524	20C
Charge/Discharge power	525	20D
Battery Voltage	526	20E
Battery Charge/Discharge current	527	20F
The residual capacity of battery	528	210
Battery Temperature	529	211
Feed in/out power	530	212
The power of the load	531	213
Input/Output power	532	214
The power of generation	533	215
EPS output voltage	534	216
EPS output power	535	217
Generation of one day	536	218
The power sell to grid of today	537	219
The power buy from grid of toda	538	21A
Today consumption of the load	539	21B
Total generation H Byte	540	21C
Total generation L Byte	541	21D
Total power sell to grid H Byte	542	21E
Total power sell to grid L Byte	543	21F
Total energy buy from grid H Byte	544	220
Total energy buy from grid L Byte	545	221
Total Consumption H Nyte	546	222
Total Consumption L Byte	547	223
Reseved	548	224
Reseved	549	225
Reseved	550	226
Reseved	551	227
Reseved	552	228
Reseved	553	229
The countdown time	554	22A
Inverter alert message	555	22B
Battery Cycle times	556	22C
INV bus voltage	557	22D
LLC bus voltage	558	22E
Buck current	559	22F
Grid R Voltage	560	230
Grid R Current	561	231
Grid S Voltage	562	232
Grid S Current	563	233
Grid T Voltage	564	234
Grid T Current	565	235
Generation current	566	236
Battery power	567	237
Inner temperature	568	238
Heat sink temperature	569	239
Country	570	23A
Current dc component	571	23B
Voltage dc component	572	23C
Battery fault message 1	573	23D
Battery fault message 2	574	23E
Battery fault message 3	575	23F
Battery fault message 4	576	240
Battery fault message 5	577	241
Communication board inner message	578	242
Today generation time	579	243
Total generation time High-Byte	580	244
Total generation time,Low-Byte	581	245

[AdyRock]

After splitting the ranges a bit more, I'm still getting the occasional split MODBUS packet. The data is all good, it's just the first V5 packet is missing the data from the last few registers of the MODBUS payload and the second V5 packet contains the remaining register data from the first request plus the data from the second request.