Off Grid Power System Controller Kit with Arduino Uno + Relay
Build a Complete Off-Grid Solar Power Controller with Arduino Uno – MPPT Charger, Relay Load Cut, and SD Card Logging
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Imagine a small solar panel charging a battery while you track every milliwatt, and a relay automatically cuts the load to prevent deep discharge. With this kit, you'll build exactly that—an off-grid power controller that logs solar input, battery voltage, and load current to an SD card with timestamps. It’s a practical introduction to solar energy systems, perfect for science fairs, engineering projects, or understanding renewable energy.
What You'll Build
A functional off-grid power system controller that harvests solar energy using a 6V panel, stores it in a 4-cell LiPo battery pack through an MPPT charging algorithm on the Arduino, and automatically disconnects the load via a 5V relay when battery voltage drops too low. Three INA219 sensors monitor solar input, battery status, and load consumption simultaneously, with all data logged to a microSD card along with a real-time clock stamp for later analysis.
What You'll Learn
- Design an MPPT algorithm to maximize solar panel power transfer to a LiPo battery
- Interface multiple I2C sensors (INA219) using an I2C multiplexer (TCA9548A) on Arduino
- Implement battery protection logic with a relay cutoff based on voltage thresholds
- Log sensor data to an SD card with timestamps from a DS3231 RTC for energy auditing
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Uno R3 | 1 |
| INA219 | 3 |
| TCA9548A I2C Mux | 1 |
| Solar Panel 6V 2W | 1 |
| IRF540N MOSFET | 1 |
| TP4056 Module | 1 |
| 18650 Cell | 4 |
| 5V Relay Module | 1 |
| 1N5819 Diode | 3 |
| 0.96in OLED | 1 |
| MicroSD Module | 1 |
| DS3231 RTC | 1 |
| 100nF Capacitors | 10 |
| PCB Prototype Board | 2 |
| 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
Designed for intermediate makers: CBSE Class 11-12 students exploring solar energy for physics or electronics projects, B.Tech ECE/EEE students prototyping renewable energy systems for hackathons or design challenges, and ATL Tinkering Lab mentors guiding students in power electronics. If you’ve built a basic Arduino project and want to understand real-world energy monitoring, this kit connects theory to practice.
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 on the box to access the AI companion trained on this exact project, or reach us on WhatsApp for step-by-step guidance from our support team.
Does this kit include a pre-programmed Arduino?
The Arduino comes unprogrammed so you can learn the coding and logic. The AI companion provides the complete code and explains every line.
Can I scale this to a larger solar panel?
The kit uses a 6V 2W panel for safe learning, but the principles apply to larger systems. The INA219 sensors can measure up to 26V and 3.2A, so you can later upgrade components.
Is soldering required?
Yes, the kit includes a soldering iron and solder wire, and you’ll assemble the circuit on prototype PCBs. Detailed schematics are provided in the AI companion.
Solar panel charges LiPo via MPPT. Load relay cuts at low battery. INA219 logs all energy flows to SD.
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.
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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