SolarDataLogger

This repo has submodules

• To clone: git clone --recurse-submodules -j8 REPO_URL
• To pull latest versin: git pull --recurse-submodules

What is all this

Firmware for custom data logger for Victron MPPT charge controllers via the Ve.Direct port/protocol.

Features

• Power via 9v-20v input or USB
• ESP32-C6 RISC-V CPU
• Wifi 6 support and provisioning credentials via BLE
• Receive, parse, and publish data from a Victron MPPT controller
• Publishes: panel voltage, battery voltage, panel current, battery current, serial number, etc
• Publish data via MQTT in InfluxDB line protocol format
• Onboard temperature and humidity sensors (AHT20)
• Support for optional add on board with current sensor (INA226) and solid state relay (CMX60D10)
• WS2812 LED for status information
• CP2102N USB Uart for programing and logging
• USB port direct to ESP32-C6
• Remote control via MQTT command channel

Supported Victron MPPT Controllers

Supports both the smaller MPPT controllers that have load output and control:

• MPPT 75/10
• MPPT 75/15
• MPPT 100/10
• MPPT 100/20

Also support larger MPPT controllers without load output via a INA226 Current sensor on an add-on board:

• MPPT 100/30
• MPPT 100/50
• MPPT 150/35
• MPPT 150/45
• MPPT 150/60
• MPPT 250/70

The Details

This is a Platform IO project. Last tested with ESP IDF 5.3.1

• /lib contains drivers and victron parser
• /src contains main program

Edit platform.ini to set some global variables and config parameters.

• INA226_PRESENT: Set this to one if you have a INA226 connected. Otherwise 0.
• AHT20_PRESENT: Set this to 1 if you have a AHT20 connected. Otherwise 0.
• SENSOR_LOCATION: Set this to any string you want. It will be included in the mqtt message. No more than 24 characters
• SENSOR_TYPE: Set this to whatever you want. i.e. ESP32-C6 or ESP32-S3. No more than 24 characters

MQTT

Channels

• Influx data is sent to MQTT_TOPIC
• Command should be submitted to the channel named mac address + "-cmd" i.e. FFEEDDCCBBAA-cmd
• Commands responses are sent to the channel named mac address. i.e. FFEEDDCCBBAA

Support remote MQTT Commands

• ota - Perform an OTA Update
• rbk - Roll back to previous version
• rst - Reboot
• png - Get a pong back
• tmp - Get current temp in C
• hum - Get current humidity
• mem - Get free heap memory
• ver - Get firmware version

OTA

• Firmware is download via https from any URL. The firmware looks for a file that is the mac address in all caps.
• Firmware URL is defined in : OTA_BASE_URL (without the filename)
• Rememeber you need to configure partitions.csv 1mb partition is not enough.

WiFi Provisioning

• To make a QR Code for provisioning use the following JSON string and fill in appropriate values: {"ver":"v1","name":"PROV_123456","pop":"abcd12345","transport":"ble"}
• Use the mobile app called "ESP BLE Provisioning"
• In menuconfig make sure that: Component config -> Bluetooth -> Bluetooth controller -> Controller Options is set to BLE not Dual Mode.

What can you do with it?

Grafana Dashboard Example

To Do

• Fix math for INA226 current sensor and address twos compliment
• CMX60D10 Relay Driver
• Some way to configure it without recompiling
• Redo design in KiCad instead of EasyEDA and add to repo
• Finish add onboard with INA226 and CMX60D10
• Code clean up. Comments, proper error handling, review memory managment, null point checks, etc
• Add remote commands for reading voltage and current data
• MQTT TLS Support

Done

• WS2812 Driver
• OTA Updates
• Wifi Provisioning via BLE