Builder Tools
Practical calculators and planning helpers for builders documenting real-world conversions, upgrades, and nontraditional RV systems.
Electrical Builder Tool
Estimate branch circuit wire size, overcurrent protection, and ending voltage for common RV, van, cargo trailer, and off-grid electrical planning.
- Publicly usable without login
- Optional save/load profile workflow for logged-in users
- Useful for early planning and quick branch-circuit checks
Battery Bank Sizing Tool
Estimate the battery capacity needed for your off-grid electrical plan based on daily usage and autonomy goals.
- Daily amp-hour planning
- Usable capacity guidance
- Good companion to electrical load planning
Solar Sizing Tool
Estimate solar wattage and basic panel sizing guidance for battery charging and daily energy recovery.
- Panel wattage planning
- Daily charging estimates
- Useful for off-grid system design
Daily Electrical Load Planner
Add common devices and estimate daily watt-hours and amp-hours for a more realistic picture of system demand.
- Appliance-by-appliance planning
- Daily usage totals
- Foundation for solar and battery sizing
Water & Tank Duration Tool
Estimate how long fresh, grey, and black tank capacity may last based on crew size and daily usage assumptions.
- Fresh water duration estimates
- Waste tank planning
- Useful for off-grid and travel endurance
Weight & Payload Planner
Estimate how build components, systems, and supplies affect payload planning and overall build weight.
- Component weight planning
- Payload awareness
- Useful before buying major systems
Build Budget Tracker Lite
Track estimated versus actual build costs across systems, materials, and upgrade categories.
- Budget planning by category
- Estimated vs actual totals
- Helpful for documenting real build decisions