MPPT charge controller for DIN rail mounting

First prototype tested, but issues should still be expected.

Schematic: PDF file

Bill of Materials: CSV file or interactive HTML BOM

Concept description

This charge controller is mainly developed to test the following features:

• Very compact and modular housing design for DIN rail mounting
• Thermal performance and maximum heat dissipation via internal heat sinks
• Performance of the internal OpAmp of the STM32G431 MCU for current measurement
• Dump-load control for small wind turbines using the existing PV reverse blocking MOSFET

Features

• Solar/Wind input terminal
  • Max. 80V (100V MOSFETs used)
  • DC/DC converter inductor current max. 20A
• Battery output terminal
  • 10 V - 32 V (supporting 12 V and 24 V battery systems)
  • Max. current: 20A (limited by inductor current)
• New STM32G431 ARM MCU with advanced digital power conversion features
• Expandable via Olimex Universal Extension Connector (UEXT)
• Only single LED as power indicator. Additional user interface can be included in separate PCB in front panel housing and connected via UEXT
• CAN interface via RJ45 connectors
• Optional external temperature sensor (10k NTC)
• DIN rail mounting using Phoenix Contact BC series housing