Compact 12V High-Pressure Washer

A single, portable washer powered from a 12 V source is all I need to keep my car, motorcycle and even the occasional bicycle spotless at home and on road trips. The goal is to combine genuine high-pressure performance with true grab-and-go portability and fuss-free operation.

Power & performance
• Runs from a 12 V car battery or a small lithium pack without tripping fuses or draining the cell too quickly.
• Delivers enough real pressure to lift grit and road film—think well above the gentle garden-hose mist many “12 V washers” offer.
• Compact pump-and-gun layout that packs easily in the trunk next to standard detailing gear.

User experience
The unit should prime quickly, connect to any small water container, and be ready to spray in seconds. Hose, trigger and nozzle changes must be quick-connect; no tools once the kit is built. Overall weight needs to stay light enough for one-handed carry between vehicles.

What I need from you
Please take the concept from idea to a ready-to-assemble kit:

1. Engineering package:
• Pump and motor selection with flow/pressure calculations
• Power circuit or battery module sizing
• Any CAD or enclosure drawings (STEP or STL)

2. Sourcing sheet: links and current prices for every off-the-shelf part, plus alternate suppliers in case of stock issues.

3. Assembly & use guide: step-by-step build photos or renders, wiring diagram, safety notes and a quick-start page so anyone in the family can operate it.

Acceptance will be based on:
• Demonstrated pressure and flow targets in your calculations or test video
• All components purchasable online today
• Clear, reproducible instructions that a hobbyist can follow without special tools

If you already have experience with small DC pumps, pressure-regulating nozzles, or battery-powered detailing tools, your insight will make this project smoother, but creative new ideas are welcome so long as they keep the washer powerful, portable and easy to use.