No status for "inv" inverters?

[pro-sumer]

Have to admit that I'm not using your library, but I am trying to profit from your investigation work. Hope you can still help me out?

My inverter is reported as type "inv", so looking at you code I assumed that I had to make this request to get the inverter's status (I'm trying to obtain the current power in W):

POST /panel/inv/getINVStatusData?plantId=... HTTP/1.1
Content-Type: application/x-www-form-urlencoded; charset=utf-8
Cookie: ...
Host: server.growatt.com
Connection: close
User-Agent: ...
Content-Length: ...

InvSn=...

However, this returns a 404.

What am I doing wrong?

Or does Growatt use something else for this kind of inverter? (When using Proxyman to capture the traffic when accessing the Growatt website, I do indeed see some of the requests from your code, but not this particular one, while the current power is displayed on the web page).

[vtraveller]

This is all much easier than you think. 😀

Open a Chrome browser (any) on a PC. Go to the Growatt page but don't sign in just yet.

Open the Chrome inspector (right click on page then Inspect).

Select Network tab.

Check the Preserve log checkbox.

Login or refresh the page if logged in.

Scroll down to any of the getXXX POSTs that you like the look of.

Note the Request URL in the Headers tab. This may pass parameters.
Note any Payload tab if listed as that's the form data.
Check you like the Response tab.

That's it. If you'd like to capture your findings on my repo I'll be happy to integrate. Don't forget to purge your IDs.

[pro-sumer]

I have been using Proxyman and Safari's developer tools (which should give similar results as Chrome).

I see only these POST requests starting with getInv:

• getInvTotalData
• getInvDayChart

Both do not seem to report the current power, while that is shown on the website.

(there is no get...StatusData request)

It's currently 0 W, so I'll probably investigate a bit more tomorrow, when/if the sun is shining again.

[vtraveller]

Ok. So it's possible that Growatt are rolling out changes in their usual haphazard way.

I'd be looking for the old .do GET requests/POSTs and see if you need to crib the HTML.

I'm sorry I can't offer more help. I can trawl the original Python code before I did what I did, to see a pattern.

This isn't actually my field. I don't typically work with servers or Python, but I am a Software Engineer. I usually decipher what I can see and trigger in these cases.

[pro-sumer]

Think I got the data I was looking for.

It's obj.datas.pac in the result of this call:

https://server.growatt.com/panel/getDevicesByPlantList

[vtraveller]

Ok. So pac = Power AC I'm assuming.

I wonder how that differs from Local Load. There should be a relationship.

[vtraveller]

I thought I'd pull out the 'pac' field to work out what it was:

rawGetDevices()
[
  {
    'dtc': '3701',
    'pac': '-862',
  }
]

rawGetStatusData()
{
  'pdisCharge1': 0.0,
  'chargePower': 0.85, 
  'pactouser': 0.03, 
  'ppv': 1.89,
  'pactogrid': 0.0,
  'pLocalLoad': 1.07,
}

My conclusion is that 'pac' is in Wh, while 'chargePower' - 'pdisCharge1' is the same in 'kWh'. Be it with an inexplicable margin of error, possibly because 'pactouser' needs to be factored in.

If you don't have this data on 'inv', fair enough, that's your only option. However, its also possible 'inv' will migrate to here, so you'll need these variables x 1000. Which is what the helpers do in my library.