Vehicle and Mobile Builds

Vehicle-Mounted Meshtastic Node Build

A vehicle-mounted mesh node extends your coverage as you drive and creates a mobile relay point that dramatically improves network coverage in areas you travel through regularly.

Vehicle Safety Warnings (Read First)

Design Goals for Vehicle Installations

Hardware Bill of Materials

ComponentRecommendedApprox. Cost
LoRa nodeLILYGO T-Beam v1.2 (classic) or T-Beam Supreme (higher-spec)Classic ~$35-45; Supreme ~$50-65 (Rokland/LILYGO listings, as of 2026-06-08)
External antennaTrue 915 MHz magnetic-mount whip with a ground plane (the vehicle roof). Note: the Taoglas FXP73 is a 2.4 GHz flexible adhesive PCB antenna, NOT a 915 MHz mag-mount, and does not provide its own ground plane - do not substitute it here.$25-40
Antenna cableSMA to SMA, 5m, LMR-195 (a 5 m LMR-195 run loses ~1.7 dB at 915 MHz, ~0.36 dB/m - keep it as short as practical, or step up to LMR-240 to roughly halve the loss)$15-20 (current listings, as of 2026-06-08)
Power supply12V to 5V USB buck converter (3A is generous headroom)$8-12 (current listings, as of 2026-06-08)
EnclosureSmall project box or 3D-printed dash mount$5-15
USB cableUSB-A to USB-C, 30cm, right-angle$5

Antenna Mounting Options

The antenna location has the biggest impact on performance:

Power Wiring

12V vehicle fuse panel
 → In-line fuse (sized to the wire gauge), installed within ~15 cm of the tap
 → Buck converter (12V to 5V/3A)
 → USB-C to T-Beam or other node

Recommended wiring gauge: 18 AWG minimum
Fuse sizing: choose the fuse to protect the WIRE, not just the device draw -
an 18 AWG conductor should be protected by a fuse no larger than ~5-7A.
Do not increase the fuse rating to stop nuisance blows without also
increasing the wire gauge.

Place the in-line fuse within a few inches (~15 cm) of the 12V tap/source, before any long wire run, so the entire downstream conductor is protected against a short-to-chassis fire (standard automotive fuse-placement practice). Use an add-a-circuit fuse tap on a non-critical accessory circuit, fuse on the supply side, and secure and grommet wires away from heat and moving parts. If you are not confident wiring into the vehicle, have it installed professionally. Never tap airbag, ABS, or other safety circuits.

Tap from a switched 12V source (ignition-switched) so the node powers off when the vehicle is off. Alternatively, use an always-on source if you want the node to continue operating as a parked relay - but ensure your vehicle battery won't be drained. Add a low-voltage disconnect (LVD) module inline between the 12V tap and the buck converter so the node load is cut before the battery is depleted. For a flooded lead-acid starter battery, set the cutoff around ~12.2-12.4V resting (a starter battery shouldn't routinely be drawn much lower, or the vehicle may not start); the exact threshold depends on battery type. Be aware that any always-on load can leave the vehicle unable to start if left long enough.

Configuration for Mobile Use

# Device role for a mobile/vehicle node (ROUTER_CLIENT was retired in
# firmware 2.3.15 - use CLIENT, or CLIENT_MUTE if it should not rebroadcast):
meshtastic --set device.role CLIENT

# Position update interval for moving vehicle (60 seconds):
meshtastic --set position.position_broadcast_secs 60

# Ensure GPS is enabled for live position (gps_mode enum, not the old boolean):
meshtastic --set position.gps_mode ENABLED

# Keep BLE active for the phone connection. Note: 0 is NOT "always on" - it
# is the default 1-minute timeout. To keep BLE active longer, set a large
# value, e.g. one day:
meshtastic --set power.wait_bluetooth_secs 86400

Portable Go-Kit: Field-Deployable Mesh Node

A go-kit is a self-contained, rapidly deployable mesh node in a single weather-resistant case. It powers up in under 2 minutes. Runtime depends entirely on the battery, the node role, and display use: with the 12V 20Ah LiFePO4 pack specified below, a low-power RAK4631 will run for many days to weeks (see the corrected Power Budget); a small portable pack in client mode would give the shorter 12-48 hour figures sometimes quoted for compact kits.

Go-Kit Design Philosophy

The go-kit must satisfy three constraints:

  1. One-bag portability: Everything fits in a carry-on-sized case. Target weight under 10 lbs including battery.
  2. Rapid deployment: Someone with basic training should be able to set it up correctly in under 5 minutes.
  3. 12+ hour autonomous operation: Sufficient for most emergency activations without resupply.

Go-Kit Bill of Materials

ComponentChoiceNotes
CasePelican 1510 or Nanuk 935Carry-on size, weatherproof. The Nanuk 935 is the carry-on equivalent of the Pelican 1510; the smaller Nanuk 910 holds far less and is not interchangeable.
LoRa nodeRAK4631 WisBlockLowest power; best for battery runtime
Battery20Ah LiFePO4 12V (Dakota Lithium or Battle Born)~256 Wh (12.8V nominal × 20Ah). Powers the node via the buck converter below - this pack runs a RAK4631 for weeks, not hours. Fuse and disconnect required (see safety note).
Inline fuse + disconnectFuse holder sized to wiring + master switchFuse the battery positive lead at the battery terminal and add a master disconnect (see safety note below).
Charge controllerVictron MPPT 75/1012/24V solar charge controller for the 12V LiFePO4 pack. Requires a solar panel with Vmp well above battery voltage (nominal 12V panel, Vmp ~18V).
12V→5V buck/USB regulator12V to 5V USB buck converterRequired. The RAK4631 is a 3.3V nRF52 board powered via its USB/5V input - never feed 12V directly to the board. Wiring path: battery → fuse → MPPT → 12V bus → buck → 5V USB → RAK4631.
Solar panel~25W foldable, nominal 12V (Vmp ~18V)For extended deployments. Must have Vmp ~18V to work with the 75/10 on a 12V battery - a 5V USB-style panel will NOT work with this MPPT controller.
Antenna915 MHz-tuned antenna (BNC base)Use a proper 902-928 MHz antenna. A quarter-wave whip is only ~8 cm at 915 MHz; a generic 40 cm telescoping whip is non-resonant here (~1.2 wavelengths, high VSWR, poor performance). If you want collapsible, use one specifically tuned/loaded for the 902-928 MHz band.
Antenna cableSMA to BNC, 3mAllows antenna placement away from case
DisplayOLED on RAK1921 moduleShows node status without phone

Battery safety: A 20Ah LiFePO4 cell can deliver hundreds of amps into a short - an unfused lead in a metal-tooled kit is an arc-flash and burn hazard. Fuse the battery positive at the terminal (sized to the wiring), include a master disconnect, and secure the battery so it cannot shift and short against tools or the case.

Power Budget

RAK4631 system current depends heavily on role:
 - CLIENT / low-duty roles can average low single-digit to ~15 mA.
 - ROUTER / repeater role keeps the radio in continuous RX and disables sleep;
   community measurements report ~80-100 mA constant for a RAK19007 + RAK4631
   in router mode. Measure your own setup before sizing.

Battery energy (use the pack's real voltage):
 - 12V LiFePO4 (12.8V nominal) x 20Ah = ~256 Wh
 - Capacity-based runtime (voltage-independent): 20,000 mAh / I_avg
     * at 15 mA (low-duty): ~1,333 h theoretical
     * at 100 mA (router): ~200 h theoretical
 - Derate ~2x for self-discharge, conversion losses, and TX:
   roughly 600+ h low-duty, ~100 h in router role.

For a 24-hour deployment:
 - Low-duty need: 24h * 15mA = 360 mAh
 - Router need:   24h * 100mA = 2,400 mAh
 - A 20Ah pack covers either easily; a 2Ah 18650 bank lasts ~5 days
   ONLY at ~15 mA - in router/repeater role (~100 mA) it lasts ~20 h.
   Measure your node's actual average current to size the pack.

Deployment Checklist

Labeling and Documentation

Every component should be labeled inside the kit: