Pathfinder BMS (Presale)

$199.99

This is currently a presale! This means the BMS you are ordering has not been manufactured yet. We need enough orders for the first run to keep the unit cost down.

The lead time for the first orders is estimated April 2025. Everything about this project has taken longer than we thought so far, so please be aware that the delivery date may get pushed back.

Don’t worry, cancelations will be accepted.

The pricing will be adjusted after the presale- expect it to increase! Tentatively the regular price will be around $250 and up to $300 for Tesla kits. This will be adjusted to account for tariffs, if that’s still a thing…

News & Updates

PDF Datasheet

The Pathfinder BMS is a Battery Management System for 3 to 16 cell Lithium Batteries, Designed from the ground up for DIY use.

Available on pre-order
This item will be available on April 30, 2025.

Terminal Board Selection: *

This should match your cell count. Every Pathfinder BMS comes with 1 balance wire terminal board. (Tesla kits also come with Tesla module adapter boards and wires as shown)

4 cell screw terminals $0.00 6 cell screw terminals $0.00 8 cell screw terminals $0.00 12 cell screw terminals $0.00 16 cell screw terminals $0.00 12 cell (2x 6s Tesla) screw terminals $0.00 Tesla Kits $0.00

For Tesla module plug-n-play kits, choose your battery revision.
Not sure? Read: How to identify Tesla Rev. A-B-C modules

6 cell (1 Tesla module) Revision A +$22.00 6 cell (1 Tesla module) Revision B +$22.00 6 cell (1 Tesla module) Revision C +$22.00 12 cell (2 Tesla modules) Revision A +$44.00 12 cell (2 Tesla modules) Revision B +$44.00 12 cell (2 Tesla modules) Revision C +$44.00
SKU: PathfinderV1 Categories: ,

Description

The Pathfinder BMS by Overkill Solar is a Battery Management System designed for DIY LiFePO4, NMC, and LTO batteries. 

It has been designed and engineered entirely by Overkill Solar, drawing on our years of experience supporting the various JBD BMSs which are now discontinued. 

From the ground up, this BMS design is focused on DIY use, unlike most others which are industrial designs aimed at battery manufacturers.

Engineering, Assembly, Testing, and Distribution are done in Naples, FL. Programming is mostly done in Canada, and the components are manufactured in a variety of cheaper countries.

It can operate with battery voltage up to 64V and current up to 170 amps at 100% duty cycle. It features an advanced user interface with a built-in OLED display, user input buttons, Bluetooth and WIFI connectivity, OTA & UF2 firmware updates, MQTT for Home Assistant, and status LEDs.

The cell count is field configurable from 3 to 16 cells for LiFePO4 or LTO, and 3 to 14 cells for NMC. (More than 14 cells of NMC would exceed the 64v maximum)

 The Solid state high current switch is on the positive side of the battery for simplified installation and compatibility, and includes Pre-Charge and Pre-Discharge circuits. 

The BMS’s basic functions are controlled by the Texas Instruments BQ76952 BMS chip, paired with the BQ34Z100 Fuel Gauge chip for advanced State of Charge tracking. 

The ESP32-S3 host controller configures and monitors the BMS chips, and provides an advanced user interface.

The BMS is constructed with an efficient and serviceable open frame design. The typical configuration includes: 

  • Base plate with a 1 amp passive balancer and several mounting options for surface mounting or DIN rail
  • Main board with Texas Instruments’ BQ76952 BMS chip and BQ34Z100 Fuel Gauge chip, MOSFET solid state switch, Solid brass Main terminals, Pre-Charge and Pre-Discharge circuits, and integrated copper heat sink.
  • User Interface board with OLED display, input buttons, and ESP32 microcontroller with USB, Bluetooth and WIFI
  • Balance wire terminal board with a variety of preconfigured options.

Additional information

Weight 2 lbs
Dimensions 9 × 6 × 1.5 in
Pathfinder Terminal Board

12 cell Tesla Kit, 16 cell, 4 cell, 6 cell Tesla Kit, 12 cell, 12 cell (2x Tesla Screw), 6 cell, 8 cell
Revision: (Choose Rev.A, Rev.B, or Rev.C - Must match your battery)

Rev.A, Rev.B, Rev.C
SKU PathfinderV1
Product ID 9025649

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