Imported from GitHub: Hirusha785/solar-battery-charge-controller-pcb · commit 8adcedc
Description
☀️ KiCad-based LT3652 solar battery charge controller PCB with solar input, battery charging terminals, charge/fault status header, adjustable control, schematic, PCB layout, and 3D renders.
README
Solar Battery Charge Controller PCB
KiCad-based PCB design for an LT3652 solar battery charge controller / solar power regulator. This project includes the schematic, PCB layout, routed board design, connector labeling, and 3D board renders.
The circuit is designed to take a solar input and manage battery charging using the LT3652 charger IC, with battery terminals, solar input options, and a status/control header for CHARGE, FAULT, GND, and SET.
📌 Project Overview
This PCB is a compact solar-powered battery charging controller designed for embedded, portable, and low-power solar applications.
Main functions:
- Solar input regulation
- Battery charging control
- Battery terminal connection
- Charge and fault status output
- Adjustable charge/control setting
- Screw terminal and barrel jack style input support
- KiCad schematic, PCB layout, and 3D visualization
🧩 Main Components
| Reference | Component | Description |
|---|---|---|
| U1 | LT3652 | Solar battery charger IC |
| BT1 | Battery holder / battery cell | Battery connection |
| J1 | Solar input screw terminal | VIN+ and GND input |
| J2 | Battery terminal | V_BAT+ and V_BAT- |
| J3 | Solar input barrel jack | Alternative solar input |
| J4 | Status/control header | CHARGE, FAULT, GND, SET |
| L1 | Inductor | Charging circuit inductor |
| D1, D2 | Diodes | Reverse/current path protection |
| RV1 | Potentiometer | Adjustable control setting |
| C1-C6 | Capacitors | Filtering and stability |
| R1-R7 | Resistors | Feedback, status, and control network |
🔌 Connector Pinout
J1 — Solar Input Terminal
| Pin | Signal | Description |
|---|---|---|
| 1 | VIN+ / SOLAR_IN | Positive solar input |
| 2 | GND | Solar negative / ground |
J2 — Battery Terminal
| Pin | Signal | Description |
|---|---|---|
| 1 | V_BAT+ | Battery positive |
| 2 | V_BAT- / GND | Battery negative / ground |
J3 — Solar Input Barrel Jack
| Pin | Signal | Description |
|---|---|---|
| 1 | SOLAR_IN | Solar input positive |
| 2 | GND | Ground |
| 3 | Switch pin | Barrel jack switch contact, depending on jack footprint |
Note: J1 and J3 are connected to the same solar input net, so they should not be used with two different power sources at the same time.
J4 — Status & Control Header
| Pin | Signal | Description |
|---|---|---|
| 1 | CHARGE | Charge status output |
| 2 | FAULT | Fault status output |
| 3 | GND | Ground |
| 4 | SET | Control / set input |
🖼️ PCB Preview
Schematic
PCB Layout
3D View
⚠️ Safety Notice
This PCB handles battery charging. Incorrect wiring, wrong battery chemistry, wrong charge settings, or poor thermal design can damage components or batteries.
Use proper lab testing procedures:
- Use a current-limited power supply during first power-up
- Do not leave the circuit unattended during initial charging tests
- Confirm the battery type and charging requirements
- Follow the LT3652 datasheet recommendations
- Use proper fuse/protection if used in a final product
👤 Author
Designed by Fernando S.M.H.G.