Meshtastic & MeshCore Solar Node

MESH-S is a DIY Meshtastic & MeshCore solar node for year-round outdoor use, based on real long-term observations
The project documents the enclosure, component selection, and practical experience

Included

• 3D print data for enclosure, mounting lid, spacer plate, and silica gel compartment

Printing Notes

• ASA recommended (suitable for outdoor use); approx 260 g ASA filament per node

Notes

• DIY project, no certification
• Assembly, wiring, and use at your own risk

Documentation / Assembly Guide

Required Parts (Variant S)

Electronics

• XIAO nRF52840 & Wio-SX1262 (1×, alternative)
• WisBlock The Basic RAK4631 (1×, alternative; optional RAK1901 sensor)
• MPPT Charge Controller CN3065 (1×, alternative)
• MPPT Charge Controller CN3791 (1×, alternative)

Power

• Solar panel 5 V / 2.7 W (118×173 mm) (1×)
• 18650 Case, 4 Slot Parallel (1×)
• 18650 Li‑Ion Cells (4×)

Antenna

• ALFA AOA-868-5ACM, 868 MHz, 5 dBi, N‑Male (1×)
• N‑Type Coaxial Cable U.FL MHF1 to N‑Female, min 15 mm (1×)

Hardware

• Screws M3×12, Hex Socket (18×)
• Brass Inserts M3 (18×)
• Self-tapping Screws 2×10 (17×)
• Vent Amphenol M12 (optional, 1×)

Seal

• Silicone Seal Ø 2 mm, Silicone Foam Sealing Strip (1×)
• Sikaflex 554 (assembly adhesive)
• Silicone Sealant (optional)
• Silica Gel (optional)

3D Parts

• ASA Enclosure (1×)
• Mounting Lid (with LTW) (1×, alternative)
• Mounting Lid (without LTW) (1×, alternative)
• Spacer Plate (1×)
• Silica Gel Compartment (1×)
• ASA filament (≈ 260 g)

Tools

• Hex keys, screwdrivers
• Soldering iron/heating insert for brass inserts
• Side cutters, wire strippers
• Sealant application tool (caulking gun)

Assembly (Step-by-Step)

1. Print 3D parts in ASA (enclosure, lid, spacer plate, silica gel compartment)
2. Insert brass inserts M3 into the designated receptacles
3. Glue the solar panel to the enclosure with Sikaflex
4. (Optional) Additionally seal the gap between the solar panel and the enclosure with silicone sealant
5. Mount the MPPT charge controller and MCU on the spacer plate
6. Mount the N-female connector in the enclosure
7. Connect the solar panel to the MPPT input
8. Connect the battery case to the MPPT output
9. Connect the MCU to the power supply / MPPT (depending on the selected option)
10. Insert and mount silica gel into the silica gel compartment
11. Insert the round cord seal
12. Load the battery case with 18650 cells (check polarity)
13. Close the enclosure and secure it with screws

Test

• Check correct polarity and stable connections
• Test solar charging and battery voltage
• Check antenna connection (firm fit, no tension)
• Check seal all around for a gap-free fit

Tips

• Select only one MCU option and one MPPT charge controller
• Apply sealant sparingly and evenly, observe curing time
• Replace silica gel regularly, especially in high humidity

Perform a brief outdoor function test before final closing
 

Universal Mounting System

Modular mounting concept for different mounting types without enclosure modifications

Round Structures

Suitable for masts with Ø 10–60 mm (horizontal or vertical)
Multiple mounting positions for cable ties or clamps

Rectangular Profiles

Mounting on profiles and frames from 10×10 to 60×60 mm possible

Quick Release Mount

Mechanical quick release for tool-free assembly and disassembly

Magnetic Mounting Option

Optional magnetic attachment (up to Ø56 mm) for temporary mounting on metal surfaces

Magnetic Mount:

Alternative Mounting (without Magnets):

Additional required parts:

• Brass Inserts M3 (4×)
• Screws M3×12 (4×)
• Cylinder Screws M6×12 (2×)
• Round Magnets (2×, max Ø56 mm)
• Compression Springs Ø7×19 mm (2×)

The adapter is not mandatory and can be omitted depending on the mounting type

Project Page (Documentation)

This page contains additional images, assembly instructions, and
background information about the project:

https://mesh-s.org