Go Kit Building for Mesh Nodes

Introduction

A well-built mesh go kit allows rapid deployment of a fully functional LoRa mesh node in any environment — whether that is a shelter parking lot, a hilltop relay position, or the back of a command vehicle. This page covers case selection, power systems, antenna options, node hardware, and a pre-deployment checklist.

Case Selection

Weatherproofing is the first priority. The two most common case families are:

• Pelican cases (e.g., 1510 carry-on, 1450 mid-size): High-quality latches, pressure equalization valve, pick-and-pluck foam. IP67-rated. More expensive but very durable.
• Apache cases (Harbor Freight): Functionally equivalent to Pelican at roughly 30% of the cost. IP65-rated. Pre-cut foam available; customizable with aftermarket inserts.

For a single-node portable kit, a mid-size case (Apache 3800 or Pelican 1450) is sufficient. For a multi-node relay kit with a larger battery, the Apache 4800 or Pelican 1510 provides adequate volume.

Power Systems

Battery Chemistry Comparison

Parameter	LiFePO4	SLA (AGM)
Energy density	Higher (lighter for same Ah)	Lower (heavy)
Cycle life	2,000+ cycles	300-500 cycles
Self-discharge	~3% per month	~5% per month
Cold weather performance	Good to -20C (with BMS)	Degrades below 0C
Cost per Wh	Higher upfront, lower lifetime	Low upfront
Recommended use	Primary portable kit	Base-station backup

A 10 Ah LiFePO4 battery at 12V provides 120 Wh of usable capacity (at 80% DoD = 96 Wh). This is adequate for most single-node 12-hour deployments.

Charge Controller

If solar charging is desired, a 10-20W solar panel paired with a 10A PWM charge controller (e.g., Renogy Wanderer or equivalent) is sufficient for a single-node kit. MPPT controllers improve efficiency but add cost. Ensure the controller is rated for LiFePO4 chemistry, which uses a different charge curve than SLA.

Power Budget Calculation

Before deployment, calculate the required battery capacity:

1. Measure or look up the current draw of the node hardware at full transmit and receive. Typical values:
   • T-Beam v1.1 (ESP32 + SX1276 + GPS): approximately 120 mA average (idle/receive), 200 mA peak (transmit)
   • RAK4631 (nRF52840 + SX1262): approximately 15-25 mA average, 50 mA peak
2. Add loads for any accessories: OLED display ~30 mA; USB hub ~50 mA; Raspberry Pi companion ~400 mA.
3. Calculate: mAh required = total_mA x hours divided by efficiency_factor. Use 0.85 for a new LiFePO4 pack.
4. Example: T-Beam (150 mA avg) + OLED (30 mA) = 180 mA x 12 h / 0.85 = 2,541 mAh minimum. A 5 Ah battery provides 2x margin.

Antenna Options

Antenna Type	Gain	Best Use
Stub/whip (stock)	2-3 dBi	Portable, handheld, omnidirectional coverage
Mag-mount whip (915 MHz)	3-5 dBi	Vehicle rooftop, rapid deploy, omnidirectional
Yagi (3-6 element)	8-13 dBi	Point-to-point relay link, fixed direction
Fiberglass vertical (1/2 wave)	5-6 dBi	Elevated fixed relay node, omnidirectional

For most go kits, a 5 dBi mag-mount whip on a metal ground plane (cookie sheet, vehicle roof) provides a practical balance of gain and omnidirectional coverage. Include SMA adapters and short coax pigtails in the kit.

Node Hardware Selection

• LILYGO T-Beam v1.1 or v1.2: Integrated ESP32, SX1276/SX1262, GPS, and 18650 battery holder. Best for portable handheld use. Available with 868/915/923 MHz variants.
• RAK4631 (WisBlock): nRF52840 + SX1262 modular system. Excellent power efficiency, compact. Requires WisBlock Base Board. Best for compact fixed relay builds. GPS available as an add-on module.
• Heltec LoRa32 v3: ESP32-S3 + SX1262 + integrated OLED. Good budget option for fixed relay nodes.

Pre-Deployment Checklist

• [ ] Node firmware updated to latest stable Meshtastic release
• [ ] Node name set to tactical identifier per IAP (e.g., SHELTER-B)
• [ ] Channel/PSK configured to match operational channel plan
• [ ] GPS fix confirmed (cold start may take 2-5 minutes outdoors)
• [ ] Battery charged to 100% and voltage verified (12.8V for LiFePO4)
• [ ] Antenna SMA connector torqued finger-tight plus 1/8 turn (do not over-torque)
• [ ] Coax and antenna tested for continuity (SWR check if meter available)
• [ ] Spare 18650 cells or USB power bank included
• [ ] Meshtastic app (iOS/Android) or web client tested and connected via BLE/WiFi
• [ ] Deployment contact list (COML name, frequency, mesh channel, check-in interval) printed and laminated
• [ ] ICS 214 form (blank) included for activity logging
• [ ] Case latches and pressure valve inspected; foam dry