Introduction

In this tutorial, we will show you how to make an advanced MPPT solar charge controller that accepts a high-voltage solar panel input (up to 80V) and charges 12V or 24V batteries efficiently. MPPT (Maximum Power Point Tracking) technology increases the efficiency of solar charging by extracting the maximum power available from the panel. This controller uses an Arduino Nano, a 16×2 LCD, an ACS712 current sensor, an MC34063 boost/buck IC, an LM358 op-amp, and IRFB4310 MOSFETs for switching.

Materials for the Project

1x Arduino Nano
1x 16×2 LCD
3x Push Buttons
2 x ACS712 Sensor
1 x MC34063 IC
1X LM358 IC
4X IRFB4310 MOSFETs
1X MJE13005 Transistor
1X BC547 Transistor
1 x 1N5809 Diode
1 x 1N4751 Diode
2 x MBR20100CT Diodes
1 x PC817 Optocoupler
1 x 330 uH Inductor
1 x uH Inductor
1 x 1n Capacitor
1 x 100u 50V Capacitor
4 x 1000u 100V Capacitors
2 x 5k Trimpot
1 x 1R Resistor
2 x 100R Resistors
5 x 10k Resistors
1 x 3.3k Resistor
3 x 47k Resistors
3 x 220k Resistors
1 x 1k Resistor
2 x 2 Pin Terminal Block
jumper wires

Download Circuit Diagram

Arduino Code

Gerber files

Circuit Diagram Overview

Sections:

Solar Input Stage (Up to 80V):
- Uses voltage divider for safe Arduino sensing
- Current monitored via ACS712
MPPT Control Stage:
- Arduino runs MPPT algorithm and controls PWM
- MOSFET switching with IRFB4310
- Uses MC34063 or custom buck converter stage
Battery Charging Stage:
- Controlled switching to charge 12V or 24V batteries
- LM358 for voltage level comparison (optional cutoff logic)
Display Section:
- I2C LCD for real-time data: Solar V/I, Battery V, Power

Conclusion

This high-voltage MPPT solar charge controller project is ideal for off-grid or hybrid solar systems. It offers high efficiency, safety, and expandability, charging 12V or 24V batteries from 80V solar input. You can customize the code, battery voltage range, or display features as needed.