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Building a maximum power point tracker (MPPT) - The Byte Sized Engineer | DigiKey
Powering your electronics project using a solar panel can be fun, but how do you know if you're extracting and utilizing all the power a panel can provide? I built a maximum power point tracking solar charge controller to make sure I could extract all the power available from my solar panel.
Full bill of materials can be found here: https://www.digikey.com/en/mylists/list/6UR93Q1BYV Github repository with all source files can be found here: https://github.com/bytesizedengineering/mppt-charge-controller
Byte Sized Engineer channel - https://www.youtube.com/@bytesizedengineering Maker.io - https://www.digikey.com/en/maker DigiKey’s Blog – TheCircuit https://www.digikey.com/en/blog Connect with Digi-Key on Facebook https://www.facebook.com/digikey.electronics/ And follow us on X https://twitter.com/digikey
Video Chapters: 00:00 Introduction 00:27 Solar panel specifications 02:09 Measuring a power curve 04:12 Graphing a power curve 05:18 Using a buck converter SMPS 06:08 Designing my own MPPT charge controller 06:35 Using the typical application circuit of the BQ24650 07:36 Assembling the custom PCB 09:23 Testing and troubleshooting the PCB 12:03 Writing MPPT firmware 13:35 Connecting a solar panel to the MPPT charge controller
Part List
| Image | Manufacturer Part Number | Description | Available Quantity | Price | View Details | |
|---|---|---|---|---|---|---|
 |  | BQ24650EVM-639 | EVAL BOARD FOR BQ24650 | 23 - Immediate | $970.48 | View Details |
|  | SI7288DP-T1-GE3 | MOSFET 2N-CH 40V 20A PPAK SO8 | 81665 - Immediate | $13.56 | View Details |
|  | IHLP2525CZER100M01 | FIXED IND 10UH 3A 105 MOHM SMD | 20443 - Immediate | $7.76 | View Details |
| | IHLP2525CZER1R5M01 | FIXED IND 1.5UH 9A 15 MOHM SMD | 7189 - Immediate | $7.76 | View Details |
|  | BAT54C | DIODE ARR SCHOTT 30V 200MA SOT23 | 6149 - Immediate | $0.98 | View Details |
|  | LTST-C190GKT | LED GREEN CLEAR CHIP SMD | 773134 - Immediate | $0.98 | View Details |
| | LTST-C190KRKT | LED RED CLEAR CHIP SMD | 1875371 - Immediate | $1.14 | View Details |
|  | WSL1206R0200DEA | RES 0.02 OHM 0.5% 1/4W 1206 | 9414 - Immediate | $16.99 | View Details |
| | WSL1206R0100DEA | RES 0.01 OHM 0.5% 1/4W 1206 | 10391 - Immediate | $17.56 | View Details |
|  | CGA5L1X7R1V106M160AC | CAP CER 10UF 35V X7R 1206 | 2298 - Immediate | $6.37 | View Details |
|  | GRM21BZ7YA475ME15L | CAP CER 4.7UF 35V X7R 0805 | 18123 - Immediate | $2.21 | View Details |
|  | CGA3E1X7R1V105K080AC | CAP CER 1UF 35V X7R 0603 | 21965 - Immediate | $1.80 | View Details |
|  | CGA2B3X7R1V104K050BB | CAP CER 0.1UF 35V X7R 0402 | 170231 - Immediate | $0.90 | View Details |
| | CGA5L3X7R1V225K160AB | CAP CER 2.2UF 35V X7R 1206 | 3807 - Immediate | $2.78 | View Details |
|  | C0402C220K5RACTU | CAP CER 22PF 50V X7R 0402 | 16746 - Immediate | $1.14 | View Details |
|  | RR0816P-104-D | RES SMD 100K OHM 0.5% 1/16W 0603 | 727928 - Immediate | $0.82 | View Details |
|  | RNCF0603DTE499K | RES SMD 499K OHM 0.5% 1/10W 0603 | 10374 - Immediate | $0.82 | View Details |
| | RR0816P-363-D | RES SMD 36K OHM 0.5% 1/16W 0603 | 15918 - Immediate | $0.82 | View Details |
|  | RC0603FR-075K23L | RES 5.23K OHM 1% 1/10W 0603 | 118116 - Immediate | $0.82 | View Details |
| | RMCF0603FT30K1 | RES 30.1K OHM 1% 1/10W 0603 | 234909 - Immediate 365000 - Factory Stock | $0.82 | View Details |
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