Heltec MeshSolar
Solar-powered nRF52840 + SX1262 LoRa dev board with integrated BMS supporting 1-4 cell lithium batteries, MPPT solar charging, and USB PD3.0. Designed for Meshtastic solar nodes.
$54.95
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Specifications
Components
Nordic Semiconductor nRF52840 ARM Cortex-M4 MCU with Bluetooth 5 and 1MB flash
Semtech SX1262 LoRa transceiver supporting 863-928 MHz with +22 dBm output
Overview
The Heltec MeshSolar is a modular development board combining an nRF52840 MCU with an SX1262 LoRa transceiver, designed specifically for solar-powered Meshtastic mesh nodes. It features an integrated battery management system (BMS) supporting 1-4 cell lithium-ion, lithium polymer, or LiFePO4 batteries.
Key Features
- nRF52840 MCU with Bluetooth 5, BLE, and Bluetooth Mesh support
- SX1262 LoRa transceiver with 21±1 dBm TX power and up to 10 km range
- Integrated BMS with MPPT solar charging (18-25V), USB PD3.0, and external DC input
- Multi-chemistry support — Li-ion, Li-Po, and LiFePO4 batteries (1-4 cells)
- Protection circuits — overcharge (4.3V), overcurrent (2A), undervoltage (2.5V), cell balancing (4.2V/100mA)
- M.2 PCIe modular design — MCU module connects to the BMS board via M.2 connector
- Dual IPEX antenna connectors for LoRa and BLE antennas
Interfaces
- 3x SPI, 2x I2C, 2x UART, 4x PWM, QSPI, I2S, PDM, QDEC
- USB Type-C expansion port
- XT30 solar/battery input connector
- PH2.0-8P battery cell interface
- MX1.25-9P screen expansion
- MX1.25-8P GPS/GNSS connector
Specifications
| Spec | Value |
|---|---|
| MCU | nRF52840 |
| Memory | 1MB ROM, 256KB SRAM |
| LoRa Chip | SX1262 |
| LoRa Bands | 863-870 MHz, 902-928 MHz |
| TX Power | 21±1 dBm |
| Range | Up to 10 km |
| Input Voltage | 18-24V |
| Charge Current | ≤1.5A |
| BMS Board Size | 43 x 97 x 11 mm |
| MCU Module Size | 30 x 20 x 3.2 mm |
| Weight | 35g |
| Operating Temp | -40°C to 85°C |
Use Cases
4LoRa Mesh Networking
Building off-grid mesh communication networks using LoRa radio for text messaging, location sharing, and sensor data relay without cellular or internet infrastructure.
Off-Grid Communication
Text messaging and data exchange in areas without cellular or internet coverage.
Environmental Monitoring
Monitoring environmental conditions like temperature, humidity, air quality, and weather data using remote sensors.
Remote Sensor Nodes
Deploy wireless sensor nodes in remote locations using LoRa, NB-IoT, or cellular connectivity.
Where to Buy
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