Reading Data from Wifi RS485 connector #49
Replies: 11 comments 20 replies
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Really neat idea, love it. Can't contribute at this time as it's out of my field of expertise but I know some people who I'll be sure to run the problem by. |
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@valdiressa Interesting project, thx for sharing it with us :)
Thank you for blazing the trail, who know if we will not be pushed to go this route. |
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Thank you. I think that reading directly from the inverter is definitely the best and most secure way to go. Lets hope I can find more info on the protocols to be able to decode this. Having to check Hex data strings and try to decode this is not simple..... Regards, |
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Also before i'm asked :). After looking at the Pin 3 and 4 and seen that it was very busy I shifted to pins 1 and 2 hoping that it was not but just to find that it was the exact same. |
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That looks like an Espressif chip, which would hold up why I have one on my network, can you post a clearer photo of the back of the shiny metal casing that's near the SMT connector, does it have a chip number or something? |
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Just took mine apart, it's a wroom-02u esp8266! |
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Hi all, spent a few days checking and trying to understand data being sent out but still no luck. Unfornately I am also making some major changes to the system that I probably not need the FOxEss inverter in my setup anymore. If someone else works on this issue let me know I'll help out as much as i can with the data I've already acquired. |
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Yes, many thanks! I've been able to get some data from the inverter, but the addresses don't match up with any specs or definitions. FoxESS don't reply to me asking them for documentation. Do you know what any of the addresses / data fields are? |
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Hi there. Well thats the biggest issue. Lack of documentation. So if you are using this port's RS485 you actually don't need to query anything because the wireless board already queries EVERYTHING that the FOXess cloud tracks. So the answers (data) for our possible queries are already passing on the wire. The issue is exactly that "what is what"? Funny thing is that the same inverter talking to the Meter I did manage to extract data and decode it....but again this is the inverter talking the Meter language and addresses..... The inverter does not use the same protocol on the wireless port. |
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Hello, I'm also trying to figure out how to get modbus data out of the inverter, the documentation says its possible at least over the RS485 port but it also sort of says it should work over ethernet or wifi as well. Has anyone successfully made a modbus connection to the inverter either via wifi or ethernet? I've tried using a few modbus debugging tools but haven't yet been able to make a connection. My last resort idea is to go from RS485 to usb into a low powered device (like a raspberry pi) to use a network proxy. |
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The route I've used is RS485-to-USB, have been getting data reliably for a couple of weeks now. I've been trying to figure out a few more data fields but will share my findings. I'm not sure how much further I can get without proper info from Fox. |
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I have shared my findings (and others have also contributed) here: https://github.com/StealthChesnut/HA-FoxESS-Modbus Hope it helps you in some way! |
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@MattBatesWasNotAvailable |
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I checked this link and its very promissing and one of the guys there actually read data from the RS485 port (NOT the WIFI RS485 port) so its possible. It looks like he had luck on the registers from 10000 to10027 and 11000 to 11095. I didn't try myself and unfortunately i actually disconnected the Foxess Inverter at least for a while as i'm testing other equipment setup at the moment. But there is a problem with reading this Rs485 port "if" you are using a SmartMeter like i am with configured Zero Export. This port is "bombarded" with requests from the Inverter to Chint Meter for updates on the "PowerExport" variable on the meter. It is an immensely busy port. So if you have the same setup that i have/had that will be a problem since if you add another query on the same line for registers in the Inverter that will have lots of timeouts due to the constant reads from the Inverter - Meter comms. That is why my best bet was the RS485 Wifi port.....this is basically always sending data and thats the exact data we are all looking for already. |
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I found more info about protocol. |
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Modbus works there, but it doesn't need any queries - it sends frames every 30 seconds (real time info), so there probably can't be another device on this rs485 line - there will be too much noise. |
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Foxess Sxxxx series? When connecting the meter too? Inverter ask meter and send info frame every 30 sec? |
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Nope, I've T series.
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Hi @So5nA i also have the T25 series and I'm actually using that specific port with 3 and 4 to the METER. Also tried to use 1 and 2 just to find its the same lines as 3 and 4. Different from your setup I do have a Meter there is ALOT of traffic in this line. Inverter being the master does queries much faster than 30s (its actually in the ms) to the Meter to get the Power Export value from the Meter and regulate it self for ZeroExport. On this line i could monitor the communication from the Inverter to the Meter and the Inverter actually used a standard the protocol used to query the CHINT meter. I didn't however try to query the Inverter. But I do not expect to be very successful due to constant traffic on the line. Many of my queries to the Meter (on the same line) had timeouts and could only get replies every 25 secs or so after multiple failures. Example of comms: |
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@So5nA |
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I can test next week Sxxxx, I will try - a parallel connection to the Wifi adapter like in the first post. |
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I have a question about Export Limiter. Does anybody use it? It is possible to get 0w to export. |
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Hi there. I used it. Its possible to get "near 0 to 0" I say that because of the reaction time. How it works is that an independent meter is placed at the Grid input of the site/house and it will monitor the power being exported to the grid and will feedback this info (via RS485) all the time to the inverter. The inverter will throttle down the energy production of the Solar Cells until it reaches 0 and will keep doing that all the time. If the loads increase it will try to increase the production to match if the load drops it will check if its putting out to the grid and cut it down reactively. Because its a reactive process its a "near Zero" export. In my country its not allowed to export so i have to use that. |
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Hi, valdiressa i also try to get the data from the chint. It's a little bit confusing. 3843132012026FCE134C6A2980C9913 Is that correct? How to interpret the raw data? Start Frame | Address Slave/Meter | Function Code | Power data Reg. | Numb. of Reg. to read | Raw data 4 bytes | ?? |
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Yes. |
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For information. |
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Hi all, only just discovered this thread (you guys would've saved me a lot of time 😁) but we've been working on the same thing. I put together a PoC which MITM the WiFi adapter and Fox Cloud and allows you to inject your own modbus read requests etc. You'll need to NAT traffic from the WiFi adapter to the container for this to work. https://github.com/nathanmarlor/fox-local Disappointingly however it seems that the WiFi adapter actually has less access than the standard 485 lines - i.e. PV data is inaccessible. Bizarrely it can access the 60000+ registers which is where individual cell voltages/temperatures reside. Because of this I've decided it's a bit of a dead end - my original intent was to have a fully functioning "Fox Local" which simplified monitoring by not needing an external device, wiring into the 485 connector etc. Hopefully someone else can look at this with a fresh set of eyes and move it along?! 🙂 |
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Hi everyone this is my first time ever posto on Github. I couldn't help posting because I'm been looking on the internet for a solution similar to the one provided by this integration but this is ONLY forum i found anything even remotely related to the extraction of data from a Foxess inverter.
So i've been playing with similar but came to a block in my investigations that i cant see to find a way out. I'm been "sniffing" data that the inverter sends to the wifi card directly from the RS485 connector. The code is ofcourse coded in a way but i cant seem to make sense of find a way to identify each of the values being sent from the port.
There are mostly 3 burst of data that the inverter sends from the connector (there are more but 3 are mostly repetitive) these are something like:
b'0303fd3d0d9e26fdaf99a39f8fffff99a39f9dffff99a39f99fffffffd579b579b95ffffffffffffffffffffffffff3daf380a62c4f8'
b'0303fb3d0d9eaefed3fe4de9dfd22ddeadfea7d9e1d2dfdecdfea5d9e1d2dfde99fea5d9e1d2dfc64ffea5ffffe5c3feb1ffffffffffffffffffffffffffffffa9ffa9ffa3ffc9ffff3393fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffb93836262fc'
b'0303f33d0d9e36fed57b9d9f9d9f9f93939b579b95999f9d9b5f7b9f9f9d5bc73162fe'
it sends mostly one of 35 byte and 30s later 54 bytes and 30s later 164 bytes. Does this all the time. I believe that the esp32 inside the wifi card computes this data and sends it over the internet to the Foxess cloud.
I opened the wifi card and soldered some wires to have access to the RS485 datalines.
I'm tried to make sense out of the data and even made some advances in identifying changes in the stream of data when i make changes to the inverter like shutdown a PV1 input or PV2 input...so data is here and we could extract directly from the inverter just need to understand what calculations are needed to read the attached.
Hope we can start a conversation about this.
Regards,
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