Charge Controller Firmware

Flexible firmware based on Zephyr RTOS for MPPT and PWM solar/wind charge controllers.

GitHub repository: LibreSolar/charge-controller-firmware

Features

• Running on Zephyr RTOS
• STM32F0, STM32L0 and STM32G4 series MCUs
• Different battery types supported (lead-acid, Li-ion)
• Monitoring of voltage, current and temperature
• Maximum power point tracking (MPPT) algorithm based on Perturb and Observe (P&O)
• Load output with deep-discharge protection
• CAN bus and serial interface with ThingSet protocol
• OLED display support

Supported boards

The software is configurable to support different charge controller PCBs with STM32F072, low-power STM32L072 or most recent STM32G431 MCUs:

• Libre Solar MPPT 2420 HC
• Libre Solar MPPT 2420 LC
• Libre Solar MPPT 1210 HUS
• Libre Solar PWM 2420 LUS

API documentation

The documentation auto-generated by Doxygen can be found here.

Development

The firmware is under active development and you are welcome to participate.

GitHub repository: LibreSolar/charge-controller-firmware