Add support for updating inverter registers

[kclif9]

Some registers are available through the http://5.8.8.8/?optType=ReadSetData API. It would be great if we could have support for modifying these registers through the HA integration / solax library. This would let us adjust settings based on the wholesale energy price, or switch work modes when we're wanting to import from grid and protect the battery charge% during low energy prices.

Based on some calls with my X1-Hybrid G3, these are the registers I could ascertain the values from:

Register ID	Register Description	Sample Value
30	Work Mode	See Notes
31	Minimum Capacity (%)	10
35	Charge Max Current (A)	20
36	Discharge Max Current (A)	20
37	Force Time Use Charge Period 1 Start Time (H)	13
38	Force Time Use Charge Period 1 Start Minute (M)	5
39	Force Time Use Charge Period 1 End Time (H)	15
40	Force Time Use Charge Period 1 End Time (M)	0
45	Force Time Use Charge Period 2 Start Time (H)	0
46	Force Time Use Charge Period 1 Start Minute (M)	5
47	Force Time Use Charge Period 1 End Time (H)	15
48	Force Time Use Charge Period 1 End Time (M)	0
61	Force Time Use Charge Period Enablement	See notes
135	Backup Mode Charge From Grid Enabled	See notes
136	Backup Mode Charge Start Time (H)	1
137	Backup Mode Charge Start Time (M)	0
138	Backup Mode Charge End Time (H)	2
139	Backup Mode Charge End Time (M)	30

Registers 53 - 56 contain the Static IP settings. Registers 57 - 60 contain the Default Gateway settings. Registers 153-156 contain the subnet mask. Although I can't see these getting used.

Some notes:

1. Work mode for X1-Hybrid: 0 = Self Use, 1 = Force Time Use, 2 = Backup Mode, 3 = Feed In Priority
2. Hours are always in 24 hours - Single digit if under 10 (I.e. 0 to 23)
3. Minutes have single digit if under 10 (I.e. 0 to 59)
4. FTU Charge Period Enablement: 0 = Both Disabled, 1 = Charge Period 1 Enabled, 2 = Charge Period 2 Enabled, 3 = Both Charge Periods Enabled
5. Backup Mode Charge From Grid Enabled: 0 = Disabled, 1 = Enabled

[squishykid]

I think this is a great idea! I would feel a bit more confident about implementing it if we had a better overview of which inverters supported this. Do you have some reference material?

[kclif9]

I don't have any reference material unfortunately. I saw the API listing over on the solar-meter-modbus github.
https://github.com/Marvo2011/solar-meter-modbus/blob/main/SolaX%20Pocket%20Wifi%202.0%20API.md

There's a few API's they've listed on there.

[bjorn-lebel]

Hi,
first off, great job with the plugin!
I think that this would be a great thing to implement!

What I miss, is to automate the inverter with actions in automation scripts.
Would like to have the option to set it to work mode "Manual - force charge" with the grid electricity price as trigger (for instance).

And to do that we need some "controls" on the plugin/device level.

(I have just installed the inverter so i havent checked what is possible and what is not with it yet)