The MPPT Li-Ion CN3791 Charger Board efficiently charges single-cell Li-ion batteries from solar panels using maximum power point tracking (MPPT), making it ideal for off-grid, battery-powered, and solar-powered embedded projects. Start IoT and wearables development with the ultra-compact NULA Mini ESP32-C6, featuring WiFi 6, Bluetooth 5.3, and Thread/Zigbee connectivity in a breadboard-compatible 25.33x25.33mm form factor. Built around Espressif's powerful ESP32-C6-MINI-1-N4, this board delivers wireless capabilities with power efficiency. Perfect for smart home nodes, IoT sensors, and battery-powered devices requiring wireless protocols, this board combines the latest connectivity standards with maker-friendly features like Qwiic connectors and Arduino, MicroPython and ESP-IDF support. Engineered for both prototyping and production deployment, the NULA Mini features 512KB high-performance SRAM, 4MB Flash memory, and 6 versatile GPIO pins supporting UART, SPI, I2C, PWM, and 12-bit ADC functions. Due to its small footprint, it's very convenient for breadboard prototyping. The integrated Qwiic/STEMMA QT connector enables tool-free sensor integration, while the JST battery connector with onboard power management supports 3.7V Li-Ion batteries for portable applications. Ultra-low power consumption with hardware security features, including secure boot, flash encryption, and hardware crypto engines makes this ideal for professional IoT deployments requiring both performance and security. A USB-C to USB-C cable is included in the package, so you can start programming right out of the box. This board represents the perfect balance of advanced wireless capabilities and maker accessibility, supporting Wi-Fi 6 efficiency, Bluetooth mesh networking, and Thread/Matter compatibility for future-proof IoT projects. The breadboard-compatible design with bottom-mounted ESP32-C6 maximizes prototyping space while LEGO-compatible mounting holes enable secure project integration. Complete open-source hardware design with documentation ensures unlimited customization possibilities for both hobbyist and professional applications. View our full range of Soldered Electronics products here. Features Easily program and get started using Arduino and MicroPython Wi-Fi 6 Connectivity: Integrated 802.11ax for high-efficiency, low-latency IoT applications. Bluetooth 5.3 LE: Supports mesh networking, long-range, and high-speed data transfer. Thread/Zigbee Ready: IEEE 802.15.4 radio for Matter-compatible smart home devices. Single-Core RISC-V CPU: 32bit, 160MHz Ultra-Low Power: 7µA deep sleep mode for extended battery life. Integrated Battery Management: Onboard JST connector and charger for 3.7V Li-Ion batteries. Qwiic/STEMMA QT Connector: Plug-and-play connectivity for a wide range of sensors. Hardware Security: Secure boot, flash encryption, and cryptographic hardware acceleration. Compact Form Factor: Breadboard-friendly design at just 25.33x25.33mm. Multi-Protocol Operation: Concurrent WiFi, Bluetooth, and Thread/Zigbee communication. Ample Memory: 4MB Flash and 512KB SRAM for complex applications. USB-C for Power and Programming: Modern, robust connector for data and power. Resources Full product documentation Hardware details Pinout drawing Package Contents 1x NULA Mini ESP32-C6 (no headers) 1x USB-C to USB-C cable