EVOHD+ Wrong System Power Values

[intowatt]

Alarm system

EVOHD+
Version V1.03.001

IP150+
V5.06.016

Environment

• RPI
• Python version 3.12.9

Git branch

Paradox Alarm Interface - V3.6.1
Paradox Alarm Interface (Development version)

Describe the bug

Wrong values for
EVOHD+ª System Power Battery Display 0,0 V
EVOHD+ª System Power Dc Display 0,0 V
EVOHD+ª System Power Vdc Display 1,4 V

[JCRundy]

Hello,
I can confirm this problem.
I'm attaching a screenshot of the mqtt topics and babyware values.
Have a nice day and congratulations on the work already done.

EVOHD+ : V1.08.001
IP150+ : V5.06.030
PAI : 3.6.1
HA Core : 2025.5.1
Operating System : 15.2
hardware : Generic x86-64

2025-05-11 20:34:33,609 - INFO     - PAI - Starting Paradox Alarm Interface 3.6.1
2025-05-11 20:34:33,610 - INFO     - PAI - Config loaded from /data/options.json
2025-05-11 20:34:33,610 - INFO     - PAI - Console Log level set to 20
2025-05-11 20:34:33,644 - INFO     - PAI.paradox.interfaces - Starting BasicMQTTInterface Interface
2025-05-11 20:34:33,645 - INFO     - PAI.paradox.interfaces.mqtt.core - MQTT loop started
2025-05-11 20:34:33,648 - INFO     - PAI.paradox.interfaces - Starting HomeAssistantMQTTInterface Interface
2025-05-11 20:34:33,649 - INFO     - PAI - Starting...
2025-05-11 20:34:33,649 - INFO     - PAI.paradox.paradox - Connecting to interface
2025-05-11 20:34:33,649 - INFO     - PAI.paradox.paradox - Using IP Connection
2025-05-11 20:34:33,768 - INFO     - PAI.paradox.connections.ip.connection - Connecting. Try 1/3
2025-05-11 20:34:33,771 - INFO     - PAI.paradox.connections.connection - Connection established
2025-05-11 20:34:33,771 - INFO     - PAI.paradox.connections.ip.commands - Authenticating with IP Module
2025-05-11 20:34:33,778 - INFO     - PAI.paradox.connections.ip.commands - Authentication Success. IP(114) Module version 20, firmware: 5.6, serial: xxxxxxxxxxxx
2025-05-11 20:34:33,789 - INFO     - PAI.paradox.connections.ip.commands - Session successfully established with IP Module
2025-05-11 20:34:33,789 - INFO     - PAI.paradox.paradox - Connecting to Panel
2025-05-11 20:34:33,814 - INFO     - PAI.paradox.paradox - Panel Identified EVOHD+ª version 1.8 build 1
2025-05-11 20:34:33,814 - INFO     - PAI.paradox.paradox - Initiating panel connection
2025-05-11 20:34:33,858 - INFO     - PAI.paradox.hardware.evo.panel - Installer login
2025-05-11 20:34:33,882 - INFO     - PAI.paradox.hardware.evo.panel - Authentication Success
2025-05-11 20:34:33,882 - WARNING  - PAI.paradox.hardware.evo.panel - Winload_connected is still False
2025-05-11 20:34:33,883 - INFO     - PAI.paradox.paradox - Connection OK
2025-05-11 20:34:33,883 - INFO     - PAI.paradox.paradox - Loading data from panel memory
2025-05-11 20:34:33,883 - INFO     - PAI.paradox.hardware.panel - Loading definitions
2025-05-11 20:34:33,883 - INFO     - PAI.paradox.hardware.panel - Updating Definitions from Panel
2025-05-11 20:34:34,149 - INFO     - PAI.paradox.hardware.panel - Zone definitions loaded (0.27s)
2025-05-11 20:34:34,170 - INFO     - PAI.paradox.hardware.panel - Partition definitions loaded (0.02s)
2025-05-11 20:34:34,767 - INFO     - PAI.paradox.interfaces.mqtt.core - MQTT Broker Connected
2025-05-11 20:34:39,775 - INFO     - PAI.paradox.hardware.panel - User definitions loaded (5.6s)
2025-05-11 20:34:39,857 - INFO     - PAI.paradox.hardware.panel - Loading labels
2025-05-11 20:34:39,858 - INFO     - PAI.paradox.hardware.panel - Updating Labels from Panel
2025-05-11 20:34:39,895 - INFO     - PAI.paradox.hardware.panel - Zone labels loaded (0.04s): A, B
2025-05-11 20:34:40,002 - INFO     - PAI.paradox.hardware.panel - Pgm labels loaded (0.11s):   71  PGM 01,     71  PGM 02,     71  PGM 03,     71  PGM 04,     71  PGM 05
2025-05-11 20:34:40,025 - INFO     - PAI.paradox.hardware.panel - Partition labels loaded (0.02s): xxxxxxxx
2025-05-11 20:34:40,054 - INFO     - PAI.paradox.hardware.panel - User labels loaded (0.03s): xxxxx, xxxxx, xxxxxx
2025-05-11 20:34:40,055 - INFO     - PAI.paradox.hardware.panel - Module labels loaded (0.0s): 
2025-05-11 20:34:40,077 - INFO     - PAI.paradox.hardware.panel - Door labels loaded (0.02s): Door 01, Door 02
2025-05-11 20:34:40,077 - INFO     - PAI.paradox.paradox - Running

JC

[ViktorBarzin]

+1.

I'm also experiencing the exact same issue. Here's some details:

Environment

• Panel Model: EVOHD+
• Firmware Version: 1.9 build 0
• PAI Version: 3.7.0
• Connection: Serial Port 2 via CH9121 (Serial-to-Ethernet)
• Home Assistant: Add-on installation

Problem Description

All voltage readings from the panel are incorrect:

Parameter	PAI Reading	Expected (BabyWare)
VDC	1.4V	~14V
Battery	0.0V	~12-13V
DC	0.0V	~14V

Verification: BabyWare shows correct voltage values, confirming the panel hardware and communication are working properly.

Root Cause

Debug logging reveals that the RAM block 1 parser fails to compile:

2026-01-17 16:14:26,043 - DEBUG - PAI.paradox.hardware.evo.parsers - Could not compile parser for RAM address 1. Using the original version.

RAM block 1 contains the voltage data according to parsers.py:

RAMDataParserMap = {
    1: Struct(
        # ...
        "system"
        / Struct(
            # ...
            "power"
            / Struct(
                "vdc" / ExprAdapter(Byte, lambda obj, ctx: round(obj * (20.3 - 1.4) / 255.0 + 1.4, 1), 0),
                "battery" / ExprAdapter(Byte, lambda obj, ctx: round(obj * 22.8 / 255.0, 1), 0),
                "dc" / ExprAdapter(Byte, lambda obj, ctx: round(obj * 22.8 / 255.0, 1), 0),
            ),
        ),
    ),
}

When the compiled parser fails, the fallback uncompiled version appears to read incorrect byte offsets, resulting in raw values of 0 for all three voltage fields.

Debug Logs

Initial values being set:

2026-01-17 16:00:49,819 - DEBUG - Change system/power/vdc from None(initial) to 1.4
2026-01-17 16:00:49,819 - DEBUG - Change system/power/battery from None(initial) to 0.0
2026-01-17 16:00:49,820 - DEBUG - Change system/power/dc from None(initial) to 0.0

MQTT publish:

2026-01-17 16:00:49,925 - DEBUG - MQTT: paradox/states/system/power/vdc=1.4
2026-01-17 16:00:49,925 - DEBUG - MQTT: paradox/states/system/power/battery=0.0
2026-01-17 16:00:49,925 - DEBUG - MQTT: paradox/states/system/power/dc=0.0

Parser compilation error:

2026-01-17 16:14:26,043 - DEBUG - PAI.paradox.hardware.evo.parsers - Could not compile parser for RAM address 1. Using the original version.

Expected Behavior

PAI should read and report correct voltage values matching those displayed in BabyWare.

Possible Solutions

1. Fix the compilation error for RAM block 1 parser
2. Ensure the uncompiled fallback version reads correct byte offsets for EVOHD+ v1.9
3. Add error logging to show why the parser compilation fails
4. Consider firmware-specific parser variants if the RAM structure differs between versions

Additional Context

Other data from the panel (zones, partitions, troubles, etc.) is being read correctly. Only the voltage readings in RAM block 1 are affected.