I have been trying every trick that I or an AI could think of and I cannot get the GET endpoints to work. I have been eyeing /v1/one/realTime as well. If you do manage to figure something out, I’d be excited to know how you did it.
Actually I did manage to get cell voltages of my Tower T10 battery. Use the /v1/device/realTime/data endpoint with the serial number of your battery. Check the response. There is a pointId: SUB point, its value is an array of submodule serial numbers. Take these numbers and bind them and then read again using /v1/device/realTime/data but using the submodule serial number. The response has the cell voltages. At least it worked for my Tower battery.
Thanks Marko, will try to get the cell info. 
I have a Dyness Orion 19.9 kwh whole house battery for my solar system and I’ve been looking to connect it to HA. This looks very promising. I have no software skills when it comes to API. So fingers are crossed.
Hi @ArtanAngus I would be happy to add your Dyness model to the integration. Please create an issue on GitHub with the subject "New Model Dyness Orion" and upload the output from my test script as a TXT file. You can download this file here.
This information will give me a good overview and allow me to add your model. I look forward to hearing from you.
For all other users with new (i.e., currently unsupported) Dyness devices: Please run the test script and upload the complete output in a new issue. Thank you.