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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Choose your RV solar path

Portable power station vs component RV solar

Once you know your approximate power needs, the next decision is the buying path. A self-contained station and a component build solve different problems, so this comparison starts with the use case instead of a merchant.

Disclosure: Shop.Solar may earn a commission if you buy through links on this page. This does not change your price. We present merchant options to help compare buying paths; Shop.Solar does not certify that any product is installation-ready for every RV.

Portable power station path

Simpler setup for camping and backup power

A portable power station can make sense when you want a self-contained battery and inverter with solar input, fewer component decisions, and easy movement between the RV, campsite, and home backup use.

  • Good fit for weekend trips, vanlife, emergency backup, and appliance-ready power.
  • Less wiring design than a component build, but expansion and repair choices can be more limited.
  • Use this path when simplicity matters more than custom system design.
View portable power options

Component RV solar path

Expandable build with panels, controller, and battery

A component RV solar build can make sense when you want to size panels, charge control, storage, inverter capacity, and backup charging as separate decisions.

  • Good fit for roof-mounted solar, larger battery banks, and long-term off-grid planning.
  • More flexible than a self-contained station, but it requires more design and installation review.
  • Use this path when expansion and component choice matter.
View component solar options

Calculator-first path

Size your RV loads before choosing either path

If you are not sure how much daily energy you need, start with the Shop.Solar calculator before choosing a portable station or component build.

  • Estimate daily watt-hours from actual appliances and usage hours.
  • Compare battery and panel size before looking at merchant options.
  • Use this path when your loads or travel style are still unclear.
Calculate your RV solar needs
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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.

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Read the Sizing Guide

Next Shop.Solar Planning Steps

Follow these clean internal paths to compare sizing, ROI, incentives, and tool choices without relying on duplicate or query-parameter URLs.

RV solar sizing guide

Use the formulas, examples, and calculator methodology before choosing a buyer path.

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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?

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