Vattenfall S34U18 (Sanxing SX631) change

[Spitfire69]

For the S23U18 model (Sanxing SX631) that Vattenfall is distributing now you have to increase the buffer slightly. I tried with #define BUF_SIZE 60 and it seems sufficent.

[psvanstrom]

Cool, I will add it to the main branch and update the README with info about the Sanxing SX631 meter 👍

[Spitfire69]

Yes, please do that. I have been running mine fine since a week ago now with no issues whatsoever.

[psvanstrom]

Fixed in https://github.com/psvanstrom/esphome-p1reader/pull/29 👍

[Slamkryp]

@Spitfire69 Hi! I have a few questions for you :-)

First of all, did you have any problems with getting this to work except from the buffer? I cant get it to work, i get the data from the meter but i get crc fail. What hardware are you using?

And iam interrested in what data you get from the meter as i dont get very much from my sanxing (dont have it in front of me right now) but i only think its like 8 lines and no voltages och individual phase data at all.

Looking forward for you answer :-)

[Spitfire69]

Hi, I’m using a Wemos D1 mini and it has been working flawlessly for over a month now. As mentioned the only thing needed was to extend the buffer. However before I did that I got CRC errors so my suggestion is to just add more bytes and test. Good luck!

[Slamkryp]

Ok, iam using D1 mini, tried increasing buffer to 100 (was 60, but i dont know what it was when you made yours) and still no luck with crc :-(

So for now i bypassed the crc check and now i get data to home assistant but the energy dashboard is still blank.. well well..

Hi, I’m using a Wemos D1 mini and it has been working flawlessly for over a month now. As mentioned the only thing needed was to extend the buffer. However before I did that I got CRC errors so my suggestion is to just add more bytes and test. Good luck!

[Slamkryp]

@Spitfire69 What does your sanxing output? this is what i get from mine, would like to compare your output with mine

[21:43:03][D][data:265]: 0-0:96.1.1(SANXING SMART ELECTRIC)

[21:43:04][I][crc:276]: Telegram read. CRC: E7C2 = 8B77. PASS = NO

[Spitfire69]

Edit: The output below is of course the output to HA not the output from the meter…I will see if I can fetch that to. If I recall right it was the 0-0:1.0.0 or 0-0:96.1.1 string that was too long (a long ID string) and you do not seem to have the same output at all.

Yours is not even close…has Vattenfall installed your or is it a standard Sanxing? If that is the case I guess they have different firmware.

Here’s my output:

[21:46:43][I][crc:276]: Telegram read. CRC: 84C3 = 84C3. PASS = YES [21:46:43][D][sensor:113]: 'Cumulative Active Import': Sending state 1905.56995 kWh with 3 decimals of accuracy [21:46:43][D][sensor:113]: 'Cumulative Active Export': Sending state 6.24500 kWh with 3 decimals of accuracy [21:46:43][D][sensor:113]: 'Cumulative Reactive Import': Sending state 0.00100 kvarh with 3 decimals of accuracy [21:46:43][D][sensor:113]: 'Cumulative Reactive Export': Sending state 761.00598 kvarh with 3 decimals of accuracy [21:46:43][D][sensor:113]: 'Momentary Active Import': Sending state 2.46200 kW with 3 decimals of accuracy [21:46:43][D][sensor:113]: 'Momentary Active Export': Sending state 0.00000 kW with 3 decimals of accuracy [21:46:43][D][sensor:113]: 'Momentary Reactive Import': Sending state 0.00000 kvar with 3 decimals of accuracy [21:46:43][D][sensor:113]: 'Momentary Reactive Export': Sending state 0.74100 kvar with 3 decimals of accuracy [21:46:43][D][sensor:113]: 'Momentary Active Import Phase 1': Sending state 0.11300 kW with 3 decimals of accuracy [21:46:43][D][sensor:113]: 'Momentary Active Export Phase 1': Sending state 0.00000 kW with 3 decimals of accuracy [21:46:43][D][sensor:113]: 'Momentary Active Import Phase 2': Sending state 0.12500 kW with 3 decimals of accuracy [21:46:43][D][sensor:113]: 'Momentary Active Export Phase 2': Sending state 0.00000 kW with 3 decimals of accuracy [21:46:43][D][sensor:113]: 'Momentary Active Import Phase 3': Sending state 2.22300 kW with 3 decimals of accuracy [21:46:43][D][sensor:113]: 'Momentary Active Export Phase 3': Sending state 0.00000 kW with 3 decimals of accuracy [21:46:43][D][sensor:113]: 'Momentary Reactive Import Phase 1': Sending state 0.00000 kvar with 3 decimals of accuracy [21:46:43][D][sensor:113]: 'Momentary Reactive Export Phase 1': Sending state 0.16300 kvar with 3 decimals of accuracy [21:46:43][D][sensor:113]: 'Momentary Reactive Import Phase 2': Sending state 0.02600 kvar with 3 decimals of accuracy [21:46:43][D][sensor:113]: 'Momentary Reactive Export Phase 2': Sending state 0.00000 kvar with 3 decimals of accuracy [21:46:43][D][sensor:113]: 'Momentary Reactive Import Phase 3': Sending state 0.00000 kvar with 3 decimals of accuracy [21:46:43][D][sensor:113]: 'Momentary Reactive Export Phase 3': Sending state 0.60500 kvar with 3 decimals of accuracy [21:46:43][D][sensor:113]: 'Voltage Phase 1': Sending state 231.89999 V with 3 decimals of accuracy [21:46:43][D][sensor:113]: 'Voltage Phase 2': Sending state 232.00000 V with 3 decimals of accuracy [21:46:43][D][sensor:113]: 'Voltage Phase 3': Sending state 227.89999 V with 3 decimals of accuracy [21:46:43][D][sensor:113]: 'Current Phase 1': Sending state 0.90000 A with 3 decimals of accuracy

[Slamkryp]

@Spitfire69 Can you please paste the meter output instead of what esphome p1-reader sends to home assistant? :-)

[sosandstrom]

@Slamkryp @Spitfire69 are you using 115200 baud and 8N1 (inverted) ? For some reason, my ESP32C3 cannot read any data from S34U18, but other meters such as L+G E360 work just fine.