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InfernoEmbedded / PowerScraper

A scraper for power devices to feed data to OpenEnergyMonitor
GNU General Public License v3.0
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PowerScraper on Solax X1 #5

Closed PAk-CatchFire closed 4 years ago

PAk-CatchFire commented 5 years ago

Hello. I would like to know if this would work on the 485 modbus port othe Solax X1 inverter.

Thank you and great work!!!

deece commented 5 years ago

Probably, but I haven't tested it, so I can't say 100% for sure.

It shouldn't hurt to try though (First just try monitoring rather than battery control).

PAk-CatchFire commented 5 years ago

Thank you!!!

But, do I need anything else on the 485 bus? I was hoping to port your code to a raspberry (or ESP32 in C) and communicate and give only read parametres.

Regards

deece commented 5 years ago

Nope, it should run as-is on a raspberry pi, that's how I run mine (on the same machine as EmonCMS). I just have a USB->RS485 widget to interface the pi to the inverter.

deece commented 5 years ago

If you don't configure Solax-batteryControl in the config, the script won't write to any registers.

PAk-CatchFire commented 5 years ago

Awesome!!! Is it possible to ask the inverter one parameter by one? Do you have an example of the RS485 serial packet?

On the other hand, do you have a register map of the solax inverter? Where did you get all that info? I was searching for it but couldn't find anything.

I read somewhere that this inverter only sends data on demand.

Sorry for all the questions.

deece commented 5 years ago

Yes, have a look at Inputs/SolaxModbus.py. I use a third party Modbus library, but the Modbus protocol is well documented. The call to read_input_registers is (start address, number of sequential registers to read). The offsets in solaxRegisterCallback are relative to the start address.

You can bug a Solax engineer for the read-only register map - I can't share the documentation I have unfortunately.

PAk-CatchFire commented 5 years ago

Thank you @deece I hecked SolaxModbus.py, but in that file you use: reactor.connectTCP and I thought it was a simple RS485 connection, not a TCP socket.

I thought I had to use the Modbus/RTU (RS485) protocol from the file SDM630Modbusv2.

Am I wrong?

deece commented 5 years ago

Oh, whoops, I got confused. I use Modbus/RTU to speak to my power meter. The communication with my inverters is Modbus/TCP.

I expect the registers will be the same regardless of the transport.

deece commented 5 years ago

the SDM630ModbusV2 is an external power meter, it's not related to the Solax inverter communications.

PAk-CatchFire commented 5 years ago

Ok, I see. Would you mind to make a little test on the 485 bus doing the same you do on the TCP port?

Regards

deece commented 5 years ago

My machines don't have RS485 ports, sorry