Grid Peak Shaving - Toggle

[Hatios]

Hi Kellerza,

Your work on this addon is much appreciated, everything works so well with HA to automate my parallel Sunsynk single-phase setup.

The only thing causing me grief is being able to toggle Grid Peak Shaving on and off.
I have added the custom sensor on Modbus register 293 to enable changing the wattage of Grid Peak shaving, but I've not been able to figure out how to do what's required to enable the toggle.

I understand it is on Modbus register 280 but this is a multi-bit register.
According to the doc it is bits 8-11 responsible for Grid Peak Shaving, with 0 being disabled and 1 being enabled.
I tried to understand how the timer is formatted for similar bitmask requirements but after a couple of hours of trial and error, I wasn't successful.

This causes an issue as the Sunsunk firmware won't export from the battery when Grid Peak Shaving is toggled on, regardless of the selling mode.

If you are able to help, or better yet add this function to the next release, that would be great!

Thanks

[kellerza]

These are three-phase definitions, but using the correct register & adapting the bits it might help you get to the answer

Once you have a working sensor, a PR would be appreciated

0b11 is binary for 3 and << is left shift (*2). The best place to experiment with this is a Python REPL (just run python)

    SelectRWSensor(
        178,
        "Gen peak-shaving",
        options={0b10 << 2: "Disable", 0b11 << 2: "Enable"},
        bitmask=0b11 << 2,
    ),
    SelectRWSensor(
        178,
        "Grid peak-shaving",
        options={0b10 << 4: "Disable", 0b11 << 4: "Enable"},
        bitmask=0b11 << 4,
    ),

[Hatios]

Thanks for coming back to me.

I don't have an IDE setup and unfortunately very little experience with Python, but I'm familiar with editing the mysensors.py file for the addon so I gave this a go on there.
See my example below.

From your above example, is sensor 178 not used for Load Power on the single phase definitions?
I tried using the above like so in the mysensors.py file based on your advice, but unfortunately using 2 or 4 for the shift, or trying sensor 178 or 280 both still yield errors like the below:
09:06:20 WARNING Cannot publish Grid Peak Shaving: value is None
09:06:25 WARNING grid_peak_shaving: Unknown register value 16
09:06:25 WARNING grid_peak_shaving: Unknown register value 16
09:06:31 WARNING grid_peak_shaving: Unknown register value 0
09:06:31 WARNING grid_peak_shaving: Unknown register value 0

For some context, my concern is that my 2 inverters in parallel can draw from the grid at more than the current their MCB is rated for, for quite some time before tripping which causes significant overheating in the consumer unit. I fix this with Grid Peak Shaving which works perfectly, but then all export just stops till that is disabled.
This hasn't been a big problem with the amount of sun we've been having but there was one day where the system topped up the batteries from grid and with other loads in the house (my whole home is on UPS side), the inverters were drawing around 80 amps when this should be limited to 60!
There's the potential for me being away and Grid Peak Shaving being left "off" resulting in damage or tripping a breaker while I'm not there to reset it. I want to automate it being toggled on during grid charging and off during grid export.

Thanks!

[kellerza]

You have to change the 178 to 280. 178 is for three-phase.

Apologies if my first sentence was not clear enough

[kellerza]

You might also have to adapt the actual bits / shift operation to what you see in the modbus register documentation.

[Hatios]

I believe I have this working, without any shifting.
I looked at the error I was getting when just trying the below (not making any changed just in case it sent a weird command but looking at the values in the log):
SENSORS += SelectRWSensor(280, "Grid Peak Shaving", options={0: "Disable", 1: "Enable"},),

This reported back that it unknown value 8192, which is a single bit in the 1 position in the 14th slot which i believe is something to do with "On Grid Always On", not sure what that is but I will leave it alone :D

I then calculated the decimal value of the 14 digits if position 9 was in the on position as 8488.
I updated my sensor line to use these numbers instead of 0 and 1.

SENSORS += SelectRWSensor(280, "Grid Peak Shaving", options={8192: "Disable", 8448: "Enable"},),

Hey presto, now when I toggle the setting on the sunsynk app, it is read correctly in HA and if i toggle it, it works on the inverter too!

I appreciate that this setting is adjusting the entire 16 bit register, but I do not believe I have need to touch any of the other settings that this block seems to contain.