Why limiting to 16A while EMH1 is supported till 32 one phase?

[Checcone]

Hello! I'm wondering why you decided to limit it to 16 A, any limitation by the propetary registry?

Thank you

[matfroh]

thanks @Checcone for starting the discussion.
There is a beta-release now available for testing!
I created this code from scratch as nothing was existing and wanted a rapid way to steer my 11kw (16A 3-phase) setup. There are different version of the ABL EMH1 charger on the market, some supporting only 16A, some supporting 32A, some supporting only 1 phase, some working on 3 phases, some limited in the hardware, some setup by jumpers and some setup by software. I went with what worked for mine.
The hardware's API documentation will not tell you if the device is in a 16A mode or a 32A mode and I wrote my code for my own setup :-).
I have now rewritten the code to properly select at installation if your setup is a 16A or 32A. Keep in mind, I don't touch the configuration of the charger, but will accepte 32A as a maximum value for the slider.
I have as well kept the it as 16A or 32A choice, as the charger can be setup either in 1-phase or 3-phase, to avoid confusion.

Let me know if the beta-release works so that I can release. On my 16A setup it works both as an update and as a fresh install. If you have already installed it as a 16A, you will need to re-install to be offered the choice to select either 32A or 16A.

Let me know.

[matfroh]

reading the log from the ABL software, it seems there is a way to read the maximum hardware limitation:
Looking at the ABL log:
asc_tx_conv :0103000F0005E8
asc_rx_conv >01030A0F3F010B010B0109010978
The response shows register 15 = 0x0F3F = 3903 decimal, and 3903 / 244 = 16.0 exactly.
Here's a simple function that could read this:

def read_max_current_setting(self) -> Optional[int]:
    """Read the maximum current setting from register 0x000F."""
    _LOGGER.debug("Starting read_max_current_setting()")
    try:
        if not self.serial or not self.serial.is_open:
            _LOGGER.error("Serial port %s is not open", self.port)
            return None

        # Read register 0x000F (same as ABL software)
        message = bytes([self.slave_id, 0x03, 0x00, 0x0F, 0x00, 0x01])  # Read 1 register
        lrc = self._calculate_lrc(message)
        formatted_message = b':' + message.hex().upper().encode() + format(lrc, '02X').encode() + b'\r\n'
        
        self.serial.write(formatted_message)
        raw_response = self.serial.readline()
        response = raw_response.decode(errors="replace").strip()

        if not response.startswith(">"):
            _LOGGER.error("Invalid response: %s", response)
            return None

        # Parse response to get register 15 value
        stripped_response = response[1:]
        data_part = stripped_response[6:-2]  # Skip header, remove LRC
        
        # Extract register 15 value
        reg15_value = int(data_part[0:4], 16)
        
        # Convert to amperage: divide by 244
        max_current = round(reg15_value / 244.0)
        
        _LOGGER.info("Max current setting: %dA (raw value: %d)", max_current, reg15_value)
        return max_current
        
    except Exception as e:
        _LOGGER.exception("Error reading max current setting: %s", str(e))
        return None

This should read the current limit setting (16A or 32A) correctly. The math register_value / 244 gives the amperage directly.

[Checcone]

Hi! I'm on a business trip this week, I'm coming back to you the next one. I'll test it and I'll let you know.

…

On Sun, Sep 14, 2025, 11:11 matfroh ***@***.***> wrote: thanks @Checcone <https://github.com/Checcone> for starting the discussion. There is a beta-release <https://github.com/matfroh/abl_emh1_modbus/releases/tag/v.1.4.1beta>now available for testing! I created this code from scratch as nothing was existing and wanted a rapid way to steer my 11kw (16A 3-phase) setup. The hardware's API will not tell you if the device is in a 16A mode or a 32A mode and I wrote my code for my own setup :-). I have now rewritten the code to properly select at installation if your setup is a 16A or 32A. Keep in mind, I don't touch the configuration of the charger, but will accepte 32A as a maximum value for the slider. I have as well kept the it as 16A or 32A choice, as the charger can be setup either in 1-phase or 3-phase, to avoid confusion. Let me know if the beta-release works so that I can release. On my 16A setup it works both as an update and as a fresh install. If you have already installed it as a 16A, you will need to re-install to be offered the choice to select either 32A or 16A. Let me know. — Reply to this email directly, view it on GitHub <#8 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BTZ5EGTR4HY7YFUKQ2J2SOL3SUWLZAVCNFSM6AAAAACBXUCPP6VHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTIMZZGUZTGOA> . You are receiving this because you were mentioned.Message ID: ***@***.***>

[matfroh]

perfect thanks!
I have created 3 betas:

1. with current code adding the selection: beta 1.4.1
2. with newer code reducing errors and "unknown" readings : beta 1.4.1.1
3. with newer code with the capability to autodetect the maximum hardware beta 1.4.1.2

if you could test all of them, would be great!

keep us posted here