https://github.com/mkrasselt1/ve.bus-library

ESP32 Arduino/PlatformIO library for Victron Multiplus VE.Bus RS485 communication
https://github.com/mkrasselt1/ve.bus-library
arduino esp32 ess inverter multiplus platformio rs485 vebus victron
Last synced: about 2 months ago
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ESP32 Arduino/PlatformIO library for Victron Multiplus VE.Bus RS485 communication
Host: GitHub
URL: https://github.com/mkrasselt1/ve.bus-library
Owner: mkrasselt1
License: other
Created: 2026-04-11T17:11:00.000Z (2 months ago)
Default Branch: main
Last Pushed: 2026-04-20T10:17:40.000Z (about 2 months ago)
Last Synced: 2026-04-20T12:29:59.028Z (about 2 months ago)
Topics: arduino, esp32, ess, inverter, multiplus, platformio, rs485, vebus, victron
Language: C
Homepage:
Size: 96.7 KB
Stars: 0
Watchers: 0
Forks: 0
Open Issues: 0
Metadata Files:
- Readme: README.md
- License: LICENSE
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README

          # VEBus — ESP32 Arduino Library for Victron Multiplus

PlatformIO / Arduino library for communicating with a **Victron Multiplus** inverter/charger over **VE.Bus RS485** from an ESP32.

Tested on the **[LilyGo T-CAN485](https://github.com/Xinyuan-LilyGO/T-CAN485)** board.

## Credits & Sources

This library is a clean-room refactor of the excellent work by **PepeTheFroggie**:

> **[Victron-VE.Bus---esp32](https://github.com/PepeTheFroggie/Victron-VE.Bus---esp32)**

> Full ESS firmware for ESP32 including WiFi dashboard, Shelly power meter

> integration, SoC tracking, and VE.Bus protocol implementation.

Protocol reference and additional features derived from:

> **[j9brown/victron-mk3](https://github.com/j9brown/victron-mk3)**

> Python Home Assistant component via MK3 USB — comprehensive VE.Bus

> protocol implementation including device state control, RAM/setting

> read/write, and firmware version queries.

> **[pv-baxi/esp32ess](https://github.com/pv-baxi/esp32ess)**

> ESP32 ESS controller with extensive protocol documentation.

> **[Victron MK2 Protocol v3.14](https://www.victronenergy.com/upload/documents/Technical-Information-Interfacing-with-VE-Bus-products-MK2-Protocol-3-14.pdf)**

> Official Victron protocol specification.

## Features

- Internal FreeRTOS task handles all RS485 RX/TX with correct sync timing

- Thread-safe command queue — call any command from any core

- **ESS power setpoint** with automatic acknowledgement tracking

- **Flexible RAM variable reading** — read any combination of up to 6 RAM variables per request

- **Setting read/write** — read and write all Multiplus configuration settings

- **Device state control** — query state, force absorption/float/equalise

- **Switch state control** — on, off, charger-only, inverter-only

- **Firmware version** query (auto-chained two-part request)

- **Setting & RAM variable info** — query scale, offset, default, min, max

- Decodes charger/inverter status, LED bitmask, DC current, temperature, AC input limits

- Auto-direction support for MAX13487E transceiver

- Comprehensive constants for RAM IDs, setting IDs, device states, LED/switch bitmasks

## ESS Setpoint Semantics

The setpoint controls power exchange on the **AC-IN (grid) side**, not AC-OUT:

| Value | Effect |

|-------|--------|

| `+300` | Invert 300 W from battery toward grid (reduces import / feeds back) |

| `-300` | Charge battery with 300 W from grid |

| `0` | Standby — grid pass-through only |

## Hardware — LilyGo T-CAN485

The T-CAN485 uses a **MAX13487E** RS485 transceiver with auto-direction

(no DE pin — the driver enables automatically when data is sent).

| Signal | GPIO | MAX13487E Pin |

|--------|------|---------------|

| RS485 RX | 21 | RO (pin 1) |

| RS485 TX | 22 | DI (pin 4) |

| /RE (receiver enable) | 17 | /RE (pin 2) — active-low, used as RTS |

| /SHDN (shutdown) | 19 | /SHDN (pin 3) — **must be driven HIGH!** |

> **Important:** GPIO 19 controls the transceiver shutdown pin. If left

> floating or driven LOW, the transceiver is completely off (no RX or TX).

> The example calls `digitalWrite(19, HIGH)` in `setup()` before

> `vebus.begin()`.

### Hardware modification required

The T-CAN485 has **100pF capacitors (C9, C11)** and a **common-mode choke

(L2)** on the RS485 A/B lines. These are designed for typical Modbus speeds

(9600–19200 baud) but can cause signal integrity issues at the VE.Bus baud

rate of **256000 baud**.

**Remove the following components** near the RS485 transceiver for reliable

operation at 256 kbaud:

- **C9** (100pF) — on the B line

- **C11** (100pF) — on the A line

- **L2** (SDCW3225S-2-102TF, common-mode choke) — between transceiver and connector

The 120Ω termination resistor (R6) and TVS protection diodes can stay.

### Wiring

Connect **3 wires** between the T-CAN485 screw terminals and the Multiplus

VE.Bus RJ45 connector:

| T-CAN485 | Multiplus VE.Bus RJ45 |

|----------|-----------------------|

| A | Pin 3 (Data+) |

| B | Pin 4 (Data−) |

| GND | Pin 5 (GND) |

> **RS485 requires a ground connection.** Without GND the common-mode voltage

> drifts and the receiver reads noise.

## Quick Start

```cpp

#include 

VEBus vebus;

void setup() {

    pinMode(19, OUTPUT);

    digitalWrite(19, HIGH);      // enable MAX13487E (/SHDN HIGH)

    vebus.begin(21, 22, 17);    // RX, TX, /RE — LilyGo T-CAN485

}

void loop() {

    // Queue commands — the library sends them at the right time

    vebus.setESSPower(300);      // push 300 W from battery toward grid

    vebus.requestReadRAM();      // request battery voltage + AC power

    if (vebus.hasNewData()) {

        vebus.clearNewData();

        Serial.printf("Bat: %.2f V  AC: %d W\n",

                      vebus.getBatVolt(), vebus.getACPower());

    }

    delay(5000);

}

```

### Reading extended RAM variables

```cpp

// Read mains voltage, mains current, inverter voltage, output power

const uint8_t ids[] = {

    VEBUS_RAM_UMAINS_RMS, VEBUS_RAM_IMAINS_RMS,

    VEBUS_RAM_UINVERTER_RMS, VEBUS_RAM_OUTPUT_POWER

};

vebus.readRAMVars(ids, 4);

// Later, check for response:

if (vebus.hasRAMVarResponse()) {

    for (int i = 0; i < vebus.getRAMVarCount(); i++)

        Serial.printf("  RAM[%d] = %d\n", i, vebus.getRAMVarValue(i));

    vebus.clearRAMVarResponse();

}

```

### Reading and writing settings

```cpp

// Read absorption voltage (setting ID 2)

vebus.readSetting(VEBUS_SETTING_UBAT_ABSORPTION);

if (vebus.hasSettingResponse()) {

    // Raw value /100 = volts (e.g. 5680 = 56.80 V)

    Serial.printf("Absorption: %.2f V\n", vebus.getSettingValue() / 100.0f);

    vebus.clearSettingResponse();

}

// Write AC input current limit (setting ID 6)

vebus.writeSetting(VEBUS_SETTING_IMAINS_LIMIT, 160);  // 16.0 A

```

### Device state and switch control

```cpp

// Query device state

vebus.requestDeviceState();

if (vebus.hasDeviceStateResponse()) {

    Serial.printf("State: %d  Sub: %d\n",

                  vebus.getDeviceState(), vebus.getDeviceSubState());

    vebus.clearDeviceStateResponse();

}

// Force charge mode

vebus.forceDeviceState(VEBUS_FORCE_ABSORPTION);

vebus.forceDeviceState(VEBUS_FORCE_FLOAT);

// Switch modes

vebus.setSwitchState(VEBUS_SWITCH_STATE_ON);            // charger + inverter

vebus.setSwitchState(VEBUS_SWITCH_STATE_CHARGER_ONLY);  // charger only

vebus.setSwitchState(VEBUS_SWITCH_STATE_INVERTER_ONLY); // inverter only

vebus.setSwitchState(VEBUS_SWITCH_STATE_OFF);            // both off (sleep)

```

## Examples

### `basic_ess` — Serial console control

Full example with automatic no-sync recovery and interactive serial commands:

| Serial input | Action |

|-------------|--------|

| `` | Set ESS power (-1875..1875 W) |

| `w` | Wakeup (switch ON) |

| `s` | Sleep (switch OFF) |

| `co` | Charger-only mode |

| `io` | Inverter-only mode |

| `v` | Request firmware version |

| `d` | Request device state |

| `r` | Read extended RAM (mains V/A, inverter V/A, output W, SoC) |

| `fa` | Force absorption |

| `ff` | Force float |

| `fe` | Force equalise |

| `rs ` | Read setting by ID |

| `ws  ` | Write setting |

| `ri ` | Query RAM variable info (scale/offset) |

| `si ` | Query setting info (scale/offset/default/min/max) |

| `h` | Show help |

### `mqtt_ha` — MQTT with Home Assistant auto-discovery

Publishes all Multiplus data as HA entities. RAM variables are read in two

batches per cycle (6 + 4 IDs), device state is polled once per cycle.

**Sensors (23):**

| Sensor | Source | Unit |

|--------|--------|------|

| Battery Voltage | `getBatVolt()` | V |

| AC Power | `getACPower()` | W |

| DC Current | `getDCCurrent()` | A |

| Temperature | `getTemp()` | °C |

| Charger Status | `getChargerStatus()` | — |

| ESS Power | local setpoint | W |

| Mains Voltage | RAM ID 0 | V |

| Mains Current | RAM ID 1 | A |

| Inverter Voltage | RAM ID 2 | V |

| Inverter Current | RAM ID 3 | A |

| Output Power | RAM ID 16 | W |

| Mains Power | RAM ID 15 | W |

| Battery Current | RAM ID 5 | A |

| State of Charge | RAM ID 13 | % |

| Mains Frequency | RAM ID 8 | Hz |

| Inverter Frequency | RAM ID 7 | Hz |

| LED On / LED Blink | `getLEDon()` / `getLEDblink()` | — |

| AC Input Min / Max / Actual | `getMin/Max/ActInputCurrentLimit()` | A |

| AC Input Config | `getAcInputConfiguration()` | — |

| Device State | `requestDeviceState()` | — |

| Charge Sub-State | `getDeviceSubState()` | — |

| Checksum Faults | `getChecksumFaults()` | — |

**Binary Sensors (2):**

| Sensor | Source |

|--------|--------|

| VE.Bus Sync | `hasNoSync()` |

| DC Allows Inverting | `dcLevelAllowsInverting()` |

**Controls (8):**

| Entity | Type | Details |

|--------|------|---------|

| ESS Power Setpoint | Number | -1875..1875 W |

| Switch State | Select | on / off / charger_only / inverter_only |

| Wakeup Multiplus | Button | — |

| Sleep Multiplus | Button | — |

| Force Absorption | Button | — |

| Force Float | Button | — |

| Force Equalise | Button | — |

Firmware version is published once (retained) at MQTT connect.

### `raw_test` — RS485 hardware test

Minimal hex dumper that bypasses the library — useful for verifying RS485 wiring.

## PlatformIO

The `platformio.ini` at the repo root has environments for all examples:

```bash

pio run -e basic_ess    # Serial console ESS control

pio run -e mqtt_ha      # MQTT → Home Assistant

```

## API Reference

### Initialisation

```cpp

void begin(int rxPin, int txPin, int dePin, int core = 0);

```

Starts UART at 256000 baud and launches an internal FreeRTOS task on the

specified core (default: 0). The task runs a tight loop with no delay to

catch sync timing.

### ESS Power

```cpp

void setESSPower(int16_t watts);

```

Queue an ESS power setpoint. Resets the command queue first (only the

latest setpoint matters). Must be sent at least every 60 seconds or the

Multiplus enters passthrough mode.

### Legacy RAM Read

```cpp

void requestReadRAM();           // request battery voltage + AC power

float   getBatVolt();            // battery voltage [V]

int16_t getACPower();            // AC power [W], positive = inverting

bool    hasNewData();            // response arrived

void    clearNewData();

```

### Flexible RAM Variable Read

```cpp

void readRAMVars(const uint8_t *ids, uint8_t count);  // up to 6 IDs

bool    hasRAMVarResponse();

void    clearRAMVarResponse();

uint8_t getRAMVarCount();

int16_t getRAMVarValue(uint8_t index);  // 0..count-1

```

### RAM Variable Write

```cpp

void writeRAMVar(uint8_t id, uint16_t value);

```

Writes to RAM only (no EEPROM). The acknowledgement is signalled via `isAcked()`.

### Setting Read

```cpp

void readSetting(uint8_t id);

bool     hasSettingResponse();

void     clearSettingResponse();

uint8_t  getSettingId();

uint16_t getSettingValue();

```

### Setting Write

```cpp

void writeSetting(uint8_t id, uint16_t value);

bool isSettingWriteAcked();

void clearSettingWriteAcked();

```

Writes to both RAM and EEPROM (persistent across power cycles).

### Switch State

```cpp

void setSwitchState(VEBusSwitchState state);

void requestSleep();   // shorthand for VEBUS_SWITCH_STATE_OFF

void requestWakeup();  // shorthand for VEBUS_SWITCH_STATE_ON

```

### Device State

```cpp

void requestDeviceState();

void forceDeviceState(VEBusForceState action);

bool    hasDeviceStateResponse();

void    clearDeviceStateResponse();

uint8_t getDeviceState();     // see VEBusDeviceState enum

uint8_t getDeviceSubState();  // see VEBusChargeSubState enum (when state=Charge)

```

### Firmware Version

```cpp

void requestVersion();         // auto-chains part 0 → part 1

bool     hasVersionResponse();

void     clearVersionResponse();

uint16_t getVersionLow();

uint16_t getVersionHigh();

```

### Setting & RAM Variable Info

```cpp

void requestSettingInfo(uint8_t id);

bool hasSettingInfoResponse();

void clearSettingInfoResponse();

const VEBusSettingInfo& getSettingInfo();

// VEBusSettingInfo: { id, scale, offset, defaultValue, minimum, maximum }

void requestRAMVarInfo(uint8_t id);

bool    hasRAMVarInfoResponse();

void    clearRAMVarInfoResponse();

uint8_t getRAMVarInfoId();

int16_t getRAMVarInfoScale();

int16_t getRAMVarInfoOffset();

```

### Broadcast Data (decoded from periodic Multiplus frames)

These values are updated continuously without sending any commands:

```cpp

// Frame 0x80 — Charger/Inverter condition

float getDCCurrent();              // battery current [A]

float getTemp();                   // device temperature [°C]

byte  getChargerStatus();          // operating mode byte

bool  dcLevelAllowsInverting();    // battery voltage sufficient?

// Frame 0x41 — MasterMultiLED

byte  getLEDon();                  // LED on bitmask (VEBUS_LED_*)

byte  getLEDblink();               // LED blink bitmask

byte  getLEDstatus();              // status register

byte  getAcInputConfiguration();   // AC input config byte

float getMinInputCurrentLimit();   // min AC input limit [A]

float getMaxInputCurrentLimit();   // max AC input limit [A]

float getActInputCurrentLimit();   // actual AC input limit [A]

byte  getSwitchRegister();         // switch register (VEBUS_SWITCH_*)

```

### Status

```cpp

bool     hasNoSync();          // no sync frame for > 1 s

bool     isAcked();            // last write command acknowledged

void     clearAcked();

uint32_t getChecksumFaults();  // RX checksum error counter

```

## Constants Reference

### RAM Variable IDs (`VEBUS_RAM_*`)

| ID | Constant | Description |

|----|----------|-------------|

| 0 | `VEBUS_RAM_UMAINS_RMS` | Mains voltage RMS (V) |

| 1 | `VEBUS_RAM_IMAINS_RMS` | Mains current RMS (A) |

| 2 | `VEBUS_RAM_UINVERTER_RMS` | Inverter output voltage RMS (V) |

| 3 | `VEBUS_RAM_IINVERTER_RMS` | Inverter output current RMS (A) |

| 4 | `VEBUS_RAM_UBAT` | Battery voltage (V) |

| 5 | `VEBUS_RAM_IBAT` | Battery current (A, signed) |

| 6 | `VEBUS_RAM_UBAT_RMS` | Battery ripple voltage |

| 7 | `VEBUS_RAM_INVERTER_PERIOD` | Inverter period (Hz = 10/value) |

| 8 | `VEBUS_RAM_MAINS_PERIOD` | Mains period (Hz = 10/value) |

| 9 | `VEBUS_RAM_SIGNED_AC_LOAD_CUR` | Signed AC load current |

| 10 | `VEBUS_RAM_VIRTUAL_SWITCH` | Virtual switch position |

| 11 | `VEBUS_RAM_IGNORE_AC_INPUT` | Ignore AC input state |

| 12 | `VEBUS_RAM_RELAY_STATE` | Multi-functional relay state |

| 13 | `VEBUS_RAM_CHARGE_STATE` | State of charge (~0.5% res.) |

| 14 | `VEBUS_RAM_INVERTER_POWER` | Inverter power, filtered (W) |

| 15 | `VEBUS_RAM_MAINS_POWER` | Mains power, filtered (W) |

| 16 | `VEBUS_RAM_OUTPUT_POWER` | Output power, filtered (W) |

| 17 | `VEBUS_RAM_INVERTER_POWER_UF` | Inverter power, unfiltered |

| 18 | `VEBUS_RAM_MAINS_POWER_UF` | Mains power, unfiltered |

| 19 | `VEBUS_RAM_OUTPUT_POWER_UF` | Output power, unfiltered |

> Use `requestRAMVarInfo(id)` to query the per-device scale and offset for

> converting raw values to physical units. Typical: voltage ×0.01, current ×0.1.

### Setting IDs (`VEBUS_SETTING_*`)

| ID | Constant | Description |

|----|----------|-------------|

| 0 | `VEBUS_SETTING_FLAGS0` | Primary flags (16-bit bitmask) |

| 1 | `VEBUS_SETTING_FLAGS1` | Secondary flags |

| 2 | `VEBUS_SETTING_UBAT_ABSORPTION` | Absorption voltage (raw/100 = V) |

| 3 | `VEBUS_SETTING_UBAT_FLOAT` | Float voltage (raw/100 = V) |

| 4 | `VEBUS_SETTING_IBAT_BULK` | Bulk charge current (A) |

| 5 | `VEBUS_SETTING_UINV_SETPOINT` | Inverter output voltage |

| 6 | `VEBUS_SETTING_IMAINS_LIMIT` | AC input 1 current limit |

| 7 | `VEBUS_SETTING_REPEATED_ABSORPTION_TIME` | Repeated absorption time |

| 8 | `VEBUS_SETTING_REPEATED_ABSORPTION_INTERVAL` | Repeated absorption interval |

| 9 | `VEBUS_SETTING_MAX_ABSORPTION_DURATION` | Max absorption duration |

| 10 | `VEBUS_SETTING_CHARGE_CHARACTERISTIC` | 0=variable, 1=fixed, 2=fixed+storage |

| 11 | `VEBUS_SETTING_UBAT_LOW_LIMIT` | Low battery cutoff (raw/100 = V) |

| 12 | `VEBUS_SETTING_UBAT_LOW_HYSTERESIS` | Low battery hysteresis |

| 13 | `VEBUS_SETTING_NUM_SLAVES` | Number of slaves connected |

| 14 | `VEBUS_SETTING_THREE_PHASE` | 0=3ph, 1=split 180°, 2=2-leg 120° |

| 44 | `VEBUS_SETTING_LOWEST_UMAINS` | Minimum acceptable mains voltage |

| 46 | `VEBUS_SETTING_HIGHEST_UMAINS` | Maximum acceptable mains voltage |

| 49 | `VEBUS_SETTING_IMAINS_LIMIT_AC2` | AC input 2 current limit |

| 60 | `VEBUS_SETTING_FLAGS2` | Additional flags |

| 61 | `VEBUS_SETTING_FLAGS3` | Additional flags |

| 64 | `VEBUS_SETTING_BATTERY_CAPACITY` | Battery capacity |

| 81 | `VEBUS_SETTING_GRID_CODE` | Grid code (0=none, 1=active) |

> Use `requestSettingInfo(id)` to query scale, offset, default, min, and max

> values for any setting.

### Device States (`VEBusDeviceState`)

| Value | Constant | Description |

|-------|----------|-------------|

| 0 | `VEBUS_STATE_DOWN` | System down |

| 1 | `VEBUS_STATE_STARTUP` | Starting up |

| 2 | `VEBUS_STATE_OFF` | Switched off |

| 3 | `VEBUS_STATE_SLAVE` | Slave mode |

| 4 | `VEBUS_STATE_INVERT_FULL` | Inverting (full) |

| 5 | `VEBUS_STATE_INVERT_HALF` | Inverting (half) |

| 6 | `VEBUS_STATE_INVERT_AES` | Inverting (AES) |

| 7 | `VEBUS_STATE_POWER_ASSIST` | Power assist |

| 8 | `VEBUS_STATE_BYPASS` | Bypass / passthrough |

| 9 | `VEBUS_STATE_CHARGE` | Charging (see sub-states) |

### Charge Sub-States (`VEBusChargeSubState`)

| Value | Constant | Description |

|-------|----------|-------------|

| 0 | `VEBUS_CHARGE_INIT` | Initialising |

| 1 | `VEBUS_CHARGE_BULK` | Bulk charge |

| 2 | `VEBUS_CHARGE_ABSORPTION` | Absorption charge |

| 3 | `VEBUS_CHARGE_FLOAT` | Float charge |

| 4 | `VEBUS_CHARGE_STORAGE` | Storage mode |

| 5 | `VEBUS_CHARGE_REPEATED_ABSORPTION` | Repeated absorption |

| 6 | `VEBUS_CHARGE_FORCED_ABSORPTION` | Forced absorption |

| 7 | `VEBUS_CHARGE_EQUALISE` | Equalisation |

| 8 | `VEBUS_CHARGE_BULK_STOPPED` | Bulk stopped |

### Switch States (`VEBusSwitchState`)

| Value | Constant | Description |

|-------|----------|-------------|

| 0x04 | `VEBUS_SWITCH_STATE_OFF` | Both charger and inverter off |

| 0x05 | `VEBUS_SWITCH_STATE_CHARGER_ONLY` | Charger on, inverter off |

| 0x06 | `VEBUS_SWITCH_STATE_INVERTER_ONLY` | Inverter on, charger off |

| 0x07 | `VEBUS_SWITCH_STATE_ON` | Both charger and inverter on |

### Force States (`VEBusForceState`)

| Value | Constant | Description |

|-------|----------|-------------|

| 0 | `VEBUS_FORCE_INQUIRY` | Read state only |

| 1 | `VEBUS_FORCE_EQUALISE` | Force equalisation charge |

| 2 | `VEBUS_FORCE_ABSORPTION` | Force absorption charge |

| 3 | `VEBUS_FORCE_FLOAT` | Force float charge |

### LED Bitmask (`VEBUS_LED_*`)

| Bit | Constant | LED |

|-----|----------|-----|

| 0 | `VEBUS_LED_MAINS_ON` | Mains present |

| 1 | `VEBUS_LED_ABSORPTION` | Absorption charging |

| 2 | `VEBUS_LED_BULK` | Bulk charging |

| 3 | `VEBUS_LED_FLOAT` | Float charging |

| 4 | `VEBUS_LED_INVERTER_ON` | Inverter active |

| 5 | `VEBUS_LED_OVERLOAD` | Overload warning |

| 6 | `VEBUS_LED_LOW_BATTERY` | Low battery warning |

| 7 | `VEBUS_LED_TEMPERATURE` | Temperature warning |

### Switch Register Bitmask (`VEBUS_SWITCH_*`)

| Bit | Constant | Meaning |

|-----|----------|---------|

| 0 | `VEBUS_SWITCH_REMOTE_CHARGE` | Remote interface charger state |

| 1 | `VEBUS_SWITCH_REMOTE_INVERT` | Remote interface inverter state |

| 2 | `VEBUS_SWITCH_FRONT_UP` | Front panel switch UP |

| 3 | `VEBUS_SWITCH_FRONT_DOWN` | Front panel switch DOWN |

| 4 | `VEBUS_SWITCH_CHARGE` | Active: charger enabled |

| 5 | `VEBUS_SWITCH_INVERT` | Active: inverter enabled |

| 6 | `VEBUS_SWITCH_ONBOARD_REMOTE_INV` | Onboard remote inverter switch |

| 7 | `VEBUS_SWITCH_REMOTE_GENERATOR` | Remote generator selected |

## License

MIT — see [LICENSE](LICENSE).

Original firmware by PepeTheFroggie, MIT licensed.
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