README.md
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Libre Solar BMS C1

 Tested prototype, only minor issues left.

This repository contains the files for ongoing development of the Libre Solar BMS C1.

Remark: This BMS was previously named BMS 16S100 SC. It was renamed to C1 (with C for compact/centralized) because the maximum current and supported number of cells depend on the parts actually populated on the PCB, so these specs should not be encoded in the PCB name.

The development of this BMS is funded by the ]]>EnAccess foundation]]>.

Schematic: PDF file

Bill of Materials: CSV file or ]]>interactive HTML BOM]]>

Firmware repository: ]]>LibreSolar/bms-firmware]]>



User manual: ]]>libre.solar/bms-c1/manual/]]>

Mechanical CAD file: bms-c1.FCStd

Mechanical BOM: bms-c1_bom_mechanical.csv

Heat sink drawings: 10003_BackPlateAsm.pdf

Test report: testing/v0.3

Features


3 to 16 Li-ion cells in series
Continuous current: 70-100A (depending on used MOSFETs and heat sink)
Cell types: LiFePO4, Li-ion NMC and others (customizable)
Measurements


Cell voltages
Pack voltage
Pack current
Pack (2x) and MOSFET temperatures

Based on Texas Instruments bq76952
Integrated high-side MOSFET switch and current sensor
Espressif ESP32-C3 microcontroller
Communication interfaces:


CAN
USB (CDC-ACM and JTAG)
USART
I2C
Bluetooth Low Energy
WiFi

Hardware features


4-layer PCB
M5 screw terminals
Heat sink at back side

Applications


Off-grid storage
Light-electric vehicles (LEV)



Firmware

The firmware is developed in a separate repository ]]>LibreSolar/bms-firmware]]>.

License

The hardware is licensed under the CERN Open Hardware Licence Version 2 - Weakly Reciprocal.

Documentation is licensed under the ]]>Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) License]]>.