almohajer / mppt-2420-hc

MPPT charge controller with HS load switch and CAN bus

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