TrailCurrent Solstice Enclosure

TrailCurrent

Printable parts for vehicles.

A collection of 3D printable enclosures, mounts, and accessories for RVs, overland rigs, trailers, and work trucks. Parts share a consistent design language and common fasteners so they stack and mount together cleanly.

👉 Browse the full collection: https://makerworld.com/en/@trailcurrent

Solstice Solar MPPT Monitor Enclosure

Solstice is the solar monitoring module in the TrailCurrent Software Defined Vehicle platform. It watches your solar charge controller and battery pack in real time, feeds the data onto your rig's local network, and keeps working when the cell signal doesn't.

What it does

If you run solar on an RV, van, trailer, boat, or off-grid build, Solstice gives you a clean view of what the panels and batteries are actually doing. State of charge, power in, voltage, current. Visible on any device on your local network, and logged locally so you own the history.

What you're printing

This profile is the 3D-printed enclosure for the Solstice module. It houses an ESP32-based board that interfaces with common MPPT controllers and reports values over the vehicle's data bus. The print includes a base and a cover with integrated mounting tabs and cable pass-throughs.

Recommended material

ABS. Solstice is intended for interior mounting near the charge controller, fuse block, or power panel, so the enclosure does not need UV resistance. ABS gives the temperature tolerance and toughness this kind of install calls for. PLA and PETG are not suitable for this part.

Print settings (as set in the included profile)

Printer: Bambu Lab H2S
Nozzle: 0.4 mm
Layer height: 0.2 mm
Walls: 2 perimeters
Top shell layers: 5
Bottom shell layers: 3
Infill: 15 percent, grid
Supports: tree (auto), 30 degree threshold
Bed: Textured PEI plate at 90 C
Nozzle: 260 C initial layer, 270 C subsequent
Orientation: as loaded in the profile

About the electronics

Solstice is part of an open-source project. The PCB design, firmware, and documentation are published under permissive licenses by the TrailCurrent open-source organization. You source or build the board from the published design and flash the firmware yourself. This Makerworld profile covers only the printed enclosure, so the electronics, wiring, and firmware are separate from this download.

Safety

This enclosure is part of a live DC power monitoring system. Wiring solar panels, batteries, and charge controllers involves voltages and currents that can cause electric shock, arc flash, burns, or fire if done incorrectly. Installation should follow your controller's manual, local electrical code, and sound practice. Do not modify the printed parts in ways that reduce clearance between live conductors and the enclosure walls, or that compromise strain relief on the cable pass-throughs.

About the project

This enclosure is part of TrailCurrent, an open-source Software Defined Vehicle platform. The matching PCB design, firmware, and documentation are released under permissive open-source licenses so you can build, modify, and repair your own module.

About this model

This part belongs to the TrailCurrent collection — a growing set of 3D printable designs for vehicle builds. If you're fitting out a camper, overland truck, trailer, or work rig, browse the rest of the collection on my profile for matching parts. Everything is designed to print cleanly on standard FDM printers without exotic materials or supports where avoidable.

Print it, share it

If you print this, please drop a photo in the Makes tab — it helps other makers discover the design and gives me feedback for the next revision. Comments, questions, and remixes are always welcome.

License

Unless otherwise noted on the individual model page, all TrailCurrent printable files are released under Creative Commons — Attribution 4.0 International (CC BY 4.0). You're free to remix, modify, and print for personal or commercial use. Please credit TrailCurrent when you share a derivative.