Arvee AmpSmart

Know your RV electrical limits before you plug in or unplug. Free shore power, off-grid, and solar calculator — no account, no ads, works offline.

Understand your RV electrical system with Arvee AmpSmart — the most comprehensive free RV power calculator available.

Whether you're plugged in at a campground, dry camping off-grid, or planning a battery and solar upgrade, AmpSmart helps you make informed decisions about your RV's electrical system.

THREE CALCULATION FLOWS:

Shore Power Check — Will running these appliances trip my breaker?

• Analyze 15A, 20A, 30A, and 50A hookups
• See total load vs. available capacity at a glance
• Get warnings for overloads, surge/startup risks, and the 80% continuous load rule
• Understand shared circuit limitations on household outlets

Off-Grid Power Budget — How long can I last on battery and solar?

• Model your battery bank by chemistry (Flooded Lead-Acid, AGM, LiFePO4) with accurate depth-of-discharge and efficiency factors
• Add solar panels with location and season-based peak sun hour presets
• Factor in generator support, inverter efficiency, and cold weather derating
• See daily consumption breakdowns, endurance estimates, and solar balance

System Builder — What battery, solar, and inverter setup do I need?

• Set your off-grid goal (days between charges) and let AmpSmart size the system
• Compare battery chemistries side by side (capacity, cost, weight, lifespan)
• Get solar, inverter, and charge controller recommendations for your location
• Enter your existing system to see exactly where it falls short

REAL-WORLD RV APPLIANCE LIBRARY:

• 37 curated presets with practical power values (A/C, microwave, fridge, CPAP, Starlink, and more)
• Three usage modes per appliance: hours/day, minutes/day, or duty cycle %
• Add custom appliances for anything not in the library
• Surge/startup wattage tracked separately for compressor-based loads

LEARN AS YOU GO:

• Contextual help articles at every step explain watts, amps, battery chemistry, solar peak sun hours, inverter efficiency, and more
• Built for RVers who want to understand their system, not just get a number

SHAREABLE REPORTS:

• Generate a branded Power Profile Report from any calculation
• Share with others or download as a file

FREE & PRIVATE:

• Completely free — no ads, no in-app purchases, no paywalls
• No account required — just open and calculate
• No personal data collected — your information stays on your device
• Works offline — no internet connection needed
• Available on iPhone, iPad, and Mac

Made with care by Arvee — the RV trip planning platform that helps RVers stay connected with friends on the road.