MPPT charge controller with HS load switch and CAN

Prototype built and tested, development ongoing (some issues might still be open).

Schematic: PDF file

Bill of Materials: CSV file or interactive HTML BOM

Firmware repository: LibreSolar/charge-controller-firmware

This charge controller design is the replacement for the MPPT 2420 LC. We are also working on an integration of MPPT control algorithms for wind turbines.

Features

• Solar 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)
• Load terminal: 20A
• New STM32G431 ARM MCU with advanced digital power conversion features
• Expandable via Olimex Universal Extension Connector (UEXT)
• Two bi-color (red/green) LEDs for status indication. Additional user interface can be included in separate PCB in front panel housing and connected via UEXT
• CAN interface via RJ45 connectors

Mechanical design

• TO-220 MOSFETs can be screwed to large heat sink at the back
• Plastic cover under development