Battery Management System BMS Demo Kit with Arduino Mega + Relay
Build a 4-Cell Battery Management System with Arduino Mega and INA219 Sensors
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Build a fully functional 4-cell Li-ion battery management system that monitors each cell’s voltage and current in real time, triggers relay cutoff during over-voltage, under-voltage, or over-current faults, and logs everything on a microSD card — just like the protection circuits inside electric vehicles and solar storage units.
What You'll Build
You'll assemble a DIN-rail mounted BMS prototype that reads individual cell data via four INA219 sensors, displays status on an OLED screen, and records timestamped logs with an RTC module. The dual relay outputs let you physically disconnect the battery pack or load when safety thresholds are crossed.
What You'll Learn
- Calibrate INA219 current/voltage sensors to accurately measure Li-ion cell parameters.
- Interface multiple I2C devices using a TCA9548A multiplexer to avoid address conflicts.
- Program Arduino Mega to implement over-voltage, under-voltage, and over-current logic with relay actuation.
- Log real-time battery data to an SD card with timestamps from a DS3231 real-time clock.
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Mega 2560 | 1 |
| INA219 | 4 |
| TCA9548A I2C Mux | 1 |
| 5V Relay Module | 2 |
| DS3231 RTC | 1 |
| MicroSD Module | 1 |
| 0.96in OLED | 1 |
| 4.7kΩ Resistors | 5 |
| 100nF Caps | 15 |
| PCB Prototype Board | 2 |
| DIN Rail Enclosure | 1 |
| Soldering Iron | 1 |
| Solder Wire | 1 |
Why Buy This Kit Instead of Sourcing Parts Separately
| Factor | Sourcing Separately | Compoden Kit |
|---|---|---|
| Compatibility checks | You verify every part | Pre-tested as a system |
| Build support | Forums and scattered tutorials | AI companion trained on this exact project |
| Time to first working build | Days of debugging | Hours, with step-by-step guidance |
| Shipping coordination | Multiple sellers, multiple delays | One shipment from Bengaluru in 3-5 days |
Who This Kit Is For
This kit is designed for CBSE Class 11-12 students exploring power electronics, B.Tech ECE/EEE undergraduates building mini projects on battery management, and Smart India Hackathon teams prototyping energy storage solutions. It also fits perfectly into ATL Tinkering Labs where students experiment with real-world power systems.
Built and Backed by Compoden
Every Compoden kit ships with an AI build companion trained on this exact project — accessible via a QR code on the box, with WhatsApp and email backup. We've spent 10 years building projects for makers, schools, and institutions across India. If a part fails because of a manufacturing defect, replace it free within 7 days.
What if I get stuck during the build?
Scan the QR code inside the box to chat with the AI companion trained on this exact BMS project. You can also reach us on WhatsApp — we'll help you within hours.
Can I modify this BMS for a 3-cell or 5-cell Li-ion pack?
Yes, with minor code adjustments and additional INA219 sensors on the multiplexer. The AI companion includes a guide for scaling up or down.
Is soldering required, and what if I've never soldered before?
Yes, the kit includes a soldering iron and solder wire. Our AI companion provides a step-by-step soldering tutorial with safety tips for first-timers.
How do I access the logged data on the SD card?
Insert the microSD card into your computer using an adapter (not included). The files are in CSV format, easy to open in Excel or Google Sheets for analysis.
Four cell Li-ion stack with INA219 per cell. Over-voltage, under-voltage and over-current relay cutoff.
What's in this kit
Choose your assembly option:
- Soldering Kit — 25W soldering iron, 60/40 solder wire, flux, and small perfboard for permanent assembly.
- Breadboard Combo — 800-point full-size breadboard with 65-piece jumper wire pack for solderless prototyping.
Other projects you can build
Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items