Start with a better plan.
Plan your layout, payload, plumbing routes and electrical systems. Size your battery bank and explore solar requirements. NPPSC connects practical planning with the story of your build.
Available Builder Tools
Practical calculators and planning tools for real-world conversions, upgrades, and nontraditional RV systems.
Plan once. Use it across your build.
Builder Tools are designed to work together. Start with one tool, then use saved planning information in other tools as your build develops.
Logged-in builders get the connected experience. Save planning profiles, reuse information between supported tools, link plans to projects, and bring project components into your planning without starting over each time.
Common Object Shape Library
Browse generic furniture, appliances and equipment in 2D and 3D. Try measurements and orientation, then choose an Object shape in your project component or manual planner item.
Browse object shapesElectrical Builder Tool
Estimate circuit voltage drop, compare copper wire sizes, and review ending voltage for common RV, van, cargo trailer, and off-grid electrical planning.
- Plan wire size and voltage drop
- Save electrical planning profiles
- Reuse saved planning information in supported tools
Battery Bank Sizing Tool
Estimate the battery capacity needed for your off-grid electrical plan based on daily usage and autonomy goals.
- Plan battery capacity around daily energy needs
- Save battery configurations
- Use saved battery plans when sizing solar
Solar Sizing Tool
Estimate the solar array needed to recover daily energy use based on sun-hours, system derate, recovery goals, and planning margin.
- Use a daily energy target from your battery plan
- Save solar plans for later
- Link saved plans to a project
Weight & Payload Planner
Estimate how build components, systems, and supplies affect payload planning and overall build weight.
- Bring project components into weight planning
- Track system and equipment weight
- Understand payload impact before major decisions
Weight & Payload Planner use guide
Place components on a visual layout. Try it without an account; sign in to save.
Plumbing & Electrical Routes
Draw and move system runs on your saved build plan. View the Weight & Payload layout as a read-only overlay; show your routes in the weight planners.
Open Plumbing & Electrical RoutesSign in and choose an existing saved plan. Start new plans in the Weight & Payload Planner.
Planned tools — not yet available
Daily Electrical Load Planner
Build a realistic daily energy estimate from the appliances and equipment you expect to use.
- Add loads appliance by appliance
- Calculate daily watt-hours and amp-hours
- Send energy requirements into battery and solar planning
Water & Tank Duration Tool
Estimate how long fresh, grey, and black tank capacity may last based on crew size and daily usage assumptions.
- Estimate fresh-water duration
- Plan grey and black tank capacity
- Connect water planning to real project needs
Build Budget Tracker Lite
Track estimated versus actual build costs across systems, materials, components, and upgrade categories.
- Plan costs by build category
- Compare estimated and actual spending
- Use project information to build a clearer cost picture
Built around your project.
Builder Tools are being developed as a connected planning system for real-world builds. As more tools become available, saved plans, project information, and components can work together to help you plan, document, and understand your build.
Your calculations are just the beginning.
NPPSC gives builders a place to keep project decisions, components, costs, photos, and progress together. Explore shared work, learn how visibility works, and see what we're preparing for 1.0.
Turn calculations into a build plan.
When registration is open, create an account to save your work, connect planning tools, link plans to projects, and reuse project information as your build develops.