RV Solar Sizing Calculator

Calculate your RV, camper van, or motorhome solar needs in minutes. Perfect for boondockers, van lifers, and anyone planning off-grid adventures.

This free calculator helps you determine how many solar panels, batteries, and charge controller capacity you need based on your daily energy consumption and travel plans. Want to understand the math? Read our solar sizing guide first.

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PACKAGE INTEREST

Help shape the first RV solar parts-list guides

Shop.Solar is collecting early interest for future RV solar buyer guides and starter parts lists. Run the calculator first to attach your category recommendation, or submit general interest now. This is not ecommerce checkout, and no products are represented as Shop.Solar-vetted yet.

No checkout, preorder, affiliate offer, or Shop.Solar-vetted product claim.

Read the Sizing Guide
BUYER GUIDE TRACKS

RV package concepts mapped from calculator results

These tracks translate the calculator categories into parts-list planning guides. They do not take orders, finalize bills of materials, or endorse products.

Maps from Weekend / Light Use calculator results.

Weekend Light Parts-List Concept

A small planning category for RV owners who want lights, phone charging, fans, and compact DC loads covered for short trips.

Parts-list focus

  • Portable or roof-mounted solar input category
  • Compact charge-control category
  • Small battery-storage category
  • DC-first wiring and fuse-planning category

Validation questions

  • Is the visitor trying to keep essentials topped up or power larger appliances?
  • Does roof space, parking shade, or portable-panel use shape the parts-list category?
  • Would a simple DC-first guide be enough before larger inverter planning?

Track interest in a simple starter guide before adding larger hardware categories.

This is a buyer-guide planning category, not a product offer or finalized bill of materials.

Maps from Boondocking Baseline calculator results.

Boondocking Baseline Parts-List Concept

A mid-size planning category for compressor fridges, fans, lights, device charging, and occasional inverter use during shorter off-grid stays.

Parts-list focus

  • Roof or portable solar input category sized for daily recharge
  • MPPT charge-control category
  • Battery-storage category with room for cloudy-day reserve
  • Occasional inverter-use category

Validation questions

  • Which loads make this more than a weekend setup?
  • How often does the visitor expect shade, winter camping, or multi-day off-grid stays?
  • Does the visitor need alternator or shore-power charging as a backup path?

Track interest in the most common off-grid planning guide before naming specific hardware.

This concept describes equipment categories for review; it does not make product, inventory, or fulfillment commitments.

Maps from Full-Time / Off-Grid and AC-Heavy or Generator-Backup calculator results.

Extended Off-Grid / Backup Parts-List Concept

A larger planning category for full-time RV use, high daily loads, or systems that need backup-charging decisions before any parts list is useful.

Parts-list focus

  • Large solar input category with roof-space review
  • Expanded battery-storage category
  • Inverter and charger-compatibility category
  • Generator, shore-power, or alternator backup-planning category

Validation questions

  • Is the high category driven by continuous daily use, AC appliances, or both?
  • What backup charging path exists when solar production drops?
  • Which documentation would be needed before naming any specific battery or inverter?

Track interest in a larger system-planning guide while keeping backup charging and component review explicit.

This is a planning concept only; high-load systems need component documentation and installation review before any recommendation is made.

Related Resources

RV Solar Sizing Guide

Learn how RV solar sizing works with formulas, examples, and sizing methodology.

RV Solar Setup Guide

Complete guide to installing solar on your RV or camper van.

Residential Solar Calculator

Planning solar for your home? Calculate residential solar ROI and payback periods.

Frequently Asked Questions

How much solar do I need for my RV?

The amount of solar you need depends on your daily energy consumption. Most RVers need between 200-800 watts of solar panels. Use our calculator above to enter your appliances and get a personalized recommendation based on your actual usage patterns.

What size battery bank do I need for boondocking?

For comfortable boondocking, we recommend battery capacity that can store 1.5-2 days worth of your energy needs. Lithium (LiFePO4) batteries are ideal as they can be discharged to 80-90% without damage, unlike lead-acid batteries which should only be discharged to 50%.

How many days of autonomy should I plan for?

Most full-time RVers plan for 1-2 days of autonomy. Weekend campers might only need 1 day. If you plan to camp in cloudy areas or during winter, consider 2-3 days of battery capacity to ensure reliable power during consecutive overcast days.

What's the difference between MPPT and PWM charge controllers?

MPPT (Maximum Power Point Tracking) controllers are 20-30% more efficient than PWM controllers, especially in cold weather or when panel voltage is significantly higher than battery voltage. For systems over 200W, MPPT is strongly recommended despite the higher cost.

Can I run my RV air conditioner on solar?

Running AC on solar is possible but requires a substantial system. A typical 13,500 BTU RV air conditioner draws 1,500-2,000 watts. You'd need 600-800W of solar panels and at least 400-600Ah of lithium batteries to run AC for several hours per day. Most RVers use shore power or a generator for AC.

Should I choose lithium or lead-acid batteries?

Lithium (LiFePO4) batteries cost 2-3x more upfront but last 5-10x longer than lead-acid. They're lighter, can be discharged deeper (80-90% vs 50%), charge faster, and perform better in cold weather. For full-time RVers, lithium usually pays for itself within 3-5 years.

How do I calculate my daily energy usage?

List all your 12V appliances and devices, note their wattage (or amps × 12V = watts), and estimate hours of use per day. For example: LED lights (30W × 4 hours = 120Wh), laptop (50W × 3 hours = 150Wh), phone charging (10W × 2 hours = 20Wh). Our calculator makes this easy with a pre-loaded appliance list.

What's the best solar panel type for RVs?

Monocrystalline panels are most efficient and perform better in low-light conditions, making them ideal for RVs where roof space is limited. Flexible panels are popular for curved roofs but typically have shorter lifespans (5-7 years vs 25+ years for rigid panels).

Need a second look at your RV solar plan?

Share your use case or calculator result. We will use early requests to prioritize RV buyer guides, parts-list categories, and installer-facing support.

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