Initial Support Solar Solax X1 Inverters

[pablozg]

Description:

Support for solax X1 solar inverters, getting all readables values by RS485 port, using a RS485 to TTL board and connected to hardware Serial of ESP8266

Checklist:

• The pull request is done against the latest dev branch
• [X ] Only relevant files were touched
• Only one feature/fix was added per PR.
• The code change is tested and works on core 2.3.0, 2.4.2 and 2.5.2 (Working with 2.5.2)
• The code change pass travis tests. Your PR cannot be merged unless tests pass
• I accept the CLA.

[arendst]

I'll merge but there are some actions I need to take:

• No need to use ifdefs in language files; if the define is not used it os not compiled either
• Fixed use of celsius is wrong; need to be changed to tasmota global temperature handling
• Consolidate code to decrease code size considerably

In the end it needs to be tested by you as I do not own the device.

[pablozg]

It's ok for me, my programming level is limited and it's a good chance to learn about code optimization. If you need I can send you the rs485 protocol used in solax inverters.

[arendst]

Well there wasn't much to gain other than masking the debug messages.

Thx for your contribution

[pablozg]

I have tested and is working without issues. By the moment the code only support one inverter at once (I only have one Inverter), but in the future if anyone needs a multi-inverter configuration I can try to make some changes.

Thanks for your continuous work with tasmota.