Solar Charging Board (3.3V Output)

Simplify your remote IoT, off-grid power management, and hardware prototypes.

Designed specifically for makers and hardware developers, this compact power management board is the perfect backbone for any remote sensor, IoT node, or solar-powered prototype. Engineered around premium Texas Instruments silicon, it seamlessly handles solar charging, battery management, and highly efficient voltage step-down—all on one ready-to-deploy footprint.

With a robust 2A output, this board easily handles the power-hungry transmission spikes of WiFi, cellular, or LoRa modules without browning out your microcontroller. Forget soldering tiny surface-mount power ICs or dealing with messy wiring; with three onboard JST connectors, integrating your solar panel, battery, and load is literally plug-and-play.

Key Features:

• High-Current 3V Output: Features the TI TLV62569DDC step-down (buck) converter, delivering up to 2A of sustained output current. Perfect for 3.3V logic microcontrollers, ESP32s, ESP8266s, and cellular/LoRa IoT nodes that demand heavy current during transmission bursts.
• Intelligent Solar Charging: Powered by the TI BQ25185 battery charger IC, ensuring safe, optimized charging for 1S NMC/LiPo batteries at up to 1A directly from a 5-7V solar panel.
• Plug-and-Play Connections: Three built-in JST connectors dedicated to the Solar Panel (Input), Battery, and Station/Load (Output) for rapid prototyping.
• Visual Diagnostics: Onboard status LEDs for quick troubleshooting ("Charge" and "Fault" indicators).
• Rugged Ready: Planning to deploy your prototype outdoors? Optional conformal coating is available upon request to protect the board from moisture, humidity, and harsh environments.
• Enclosure Friendly: Designed with standard mounting holes that drop perfectly into a polycarbonate enclosure (optional), making the leap from prototype to professional deployment a breeze.

Technical Specifications

• Input Voltage (Solar): 5V - 7V DC
• Battery Compatibility: 1S NMC (Lithium-Ion / LiPo)
• Max Charge Current: Up to 1A
• Regulated Output: 3.3V DC
• Max Output Current: Up to 2A continuous
• Primary ICs: Texas Instruments BQ25185 (Charger) & TLV62569DDC (Buck Converter)
• Board Dimensions: 45mm x 36mm (M3 mounting holes spaced 27mm apart)
• Enclosure Dimensions: 118mm x 67mm x 60mm (External), 106mm x 54mm x 49mm (Internal)

Board Schematic

Enclosure STEP

Whether you are building a custom weather station, an agricultural monitor, or LPWAN node, this board provides the rock-solid power foundation your prototype needs.