Create a Reliable Off-Grid LoRa Repeater:
A Community Project Building an effective LoRa repeater isn’t just about adding a battery to a radio. To truly survive the elements and provide a reliable off-grid signal, it requires a robust design incorporating proper weatherproofing, effective power management, and a meticulously organized internal layout. Our recent build demonstrates this, utilizing an ultra-low-power RAK4631 WisBlock paired with a high-capacity “Choice of Battery” cell to create a repeater capable of staying online even through a week of dense “gray days.”This project’s simplicity might catch some off guard. You don’t need a massive budget; some commercial repeaters can reach $500–$600, but a custom-built solution is far more cost-effective and still does same thing. Building a repeater is truly as expensive or as simple as you choose to make it, and our experience proves that you can achieve great results with a smart, streamlined approach. We’ve been building and deploying these nodes with minimal downtime and exceptional performance. Our goal is to encourage others to take the leap and contribute to this growing community project. Whether you’re a seasoned maker or a curious beginner, the resources and support are out there. So, what do you say? Give it a go and help expand a community network that’s already connecting lives and unlocking new possibilities.
1. Parts needed to start your build journey
Success starts with the right parts. Here is the verified list for this build with direct links to sourced components:
| Component | Source / Link |
|---|---|
| RAK4631 WisBlock Starter Kit | View on AliExpress |
| Samsung 58E 21700 Cell | View at Cell Supply NZ |
| 10W 5V Solar Panel | View on AliExpress |
| IP67 Waterproof Enclosure | View on AliExpress |
| 3.7V Charger/Boost Module | View on AliExpress |
| BMS Protection Board | View on AliExpress |
| Vent Plug Breather Valve | View on AliExpress |
| IP68 Waterproof Glands | View on AliExpress |
2. Estimated Build Cost
This “Bay of Plenty” spec offers an incredible performance-to-price ratio. Here is the breakdown (estimates based on early 2026 market rates and Bulk buy or specials at the time of purchasing products):
| Core Component | Estimated NZD |
|---|---|
| RAK4631 WisBlock Starter Kit | ~$50.00 |
| Samsung 58E 21700 Cell | ~$15.00 |
| 10W 5V Solar Panel | ~$22.00 |
| IP67 Enclosure & Hardware | ~$25.00 |
| Charging/BMS Modules | ~$10.00 |
| Antenna & RF Pigtails | ~$50.00 |
| Misc | ~$30.00 |
| TOTAL ESTIMATED COST | ~$200.00ish NZD |
3. Power Architecture & Wiring
To ensure 24/7 uptime, we follow a linear power path that protects the battery while providing the WisBlock with a clean 3.7V–5V feed.
- Solar Input: Panel connects via the IP68 Gland to the Charging Module.
- Battery: Choice of battery (or batteries) connects to the BMS, which then feeds the charger terminals.
- Load Output: Charger/Boost Module connects to the WisBlock via a JST PH 2.0 cable.
The BoomstickNZ Mounting Sleds
To ensure total stability in the field, I’ve developed several mounting sled designs. These are optimized for the high-capacity 18650 or 21700 cells and the WisBlock ecosystem, providing a secure, vibration-resistant home for your electronics.
Note: I have these STL files ready to go for anyone building this spec. If you are using a non-standard enclosure, I can custom-modify these files to fit your specific depth and mounting boss locations.
4. Internal Layout: The 3D Printed Sled
A 3D-printed sled ensures nothing rattles loose and prevents the heavy battery from damaging delicate modules. Use ASA or PETG—PLA will warp inside a sealed box once the summer sun hits it.
4.1. Get the 3D Files
A secure fit is what makes these nodes “bulletproof” in the field. I have designed custom 3D-printed mounting sleds specifically for these IP67 enclosures to ensure the heavy Samsung cells and RAK modules stay exactly where they belong.
- Standard STL Files: I have files ready for the 150X100X70mm and 100x68x50mm enclosures.
- Custom Sizing: If you are using a different box, I can custom-model a sled to fit your specific dimensions.
- Printing Service: If you don’t have a printer but want to build this spec, get in touch and I can run a set off on one of my machines for you.
5. Weatherproofing for the Coast
- Seal the RF: Use Self-Amalgamating Tape on external antenna connections.
- Drip Loops: Leave a loop in the solar cable before it enters the gland.
- Desiccant: Toss a silica gel pack inside before locking the hasp.
Building your own? Join the conversation in the community or reach out for site deployment advice!
6. Join the Network: The MeshCore Map
This repeater spec isn’t just a theory-it’s the current(always looking to improve where I can) standard for the MeshCore backbone across the Bay of Plenty. We currently have approximately 30+ low-powered repeaters active, providing a communication bridge from Whakatāne all the way to Waihi Beach.
Where we are: Our nodes are strategically placed on private land and high points to ensure maximum coverage for the community. By using this standardized solar build, we ensure every “link in the chain” is reliable and easy to maintain.
Are you in a “dark spot” on the map? If you have a high-point property or want to host a node, get in touch to help us bridge the gap!