SolarCalcPro

Off-Grid Solar Energy Calculator

Design your perfect off-grid solar power system with professional-grade calculators. From panel sizing to cable calculations — everything you need in one app.

Explore FeaturesDownload on App Store

Professional Solar Calculators

Six powerful tools to design your complete off-grid solar system

☀️

Solar Panel Sizing

Calculate the exact number of panels needed for your off-grid system based on your energy consumption and location.

🔋

Battery Bank Calculator

Size your battery bank for reliable energy storage. Account for depth of discharge, temperature, and autonomy days.

⚡

Daily Load Calculator

Estimate your daily energy needs by adding all appliances and devices. Automatically sizes your inverter requirements.

🔌

Inverter Sizing

Analyze your power conversion requirements. Calculate continuous and surge power needs for your off-grid system.

🎛️

Charge Controller Sizing

Calculate optimal charge controller specifications based on your panel array and battery bank configuration.

🔗

Cable Sizing

Determine proper electrical cable sizes to minimize voltage drop and ensure safe, efficient power delivery.

Design Your Solar System in 3 Steps

1

Select Calculator

Choose from six professional solar calculators tailored to each component of your system.

2

Enter Your Parameters

Input your specifications — energy needs, location, equipment details, and system requirements.

3

Get Instant Results

Receive precise calculations with detailed breakdowns and professional recommendations.

Why Choose SolarCalcPro?

Works Offline

All calculators work without internet. Perfect for remote site surveys and field work.

Built-in Reference Library

Access solar energy basics, NEC standards, and system type guides right in the app.

Save & Organize

Keep calculation history, mark favorites, and quickly reference your previous designs.

Learn While You Calculate

Comprehensive educational content built right into the app

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Solar Energy Basics

Understand the photovoltaic effect, peak sun hours, system components, and wiring configurations.

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NEC Standards

National Electrical Code requirements for solar installations, safety guidelines, and compliance.

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System Types

Compare grid-tied, off-grid, and hybrid solar systems to choose the right setup.

Trusted by Solar Professionals

4.9
★★★★★

Based on user reviews

Jake M., Solar Installer

★★★★★
Verified

This app is a game changer for field work. I can size panels and batteries on-site without lugging around charts or needing cell service. Saves me at least an hour per job.

2 days ago

Linda P., Electrical Engineer

★★★★★
Verified

The NEC reference library alone makes this worth it. Having cable sizing calculations with voltage drop right in my pocket during inspections is incredibly convenient.

5 days ago

Tom B., DIY Homeowner

★★★★★
Verified

I had zero solar knowledge and this app walked me through sizing my entire off-grid cabin system. Panel count, battery bank, charge controller — everything checked out with my installer.

1 week ago

Sarah K., RV Enthusiast

★★★★★
Verified

Perfect for van life! I redesigned my RV solar setup using the daily load calculator. Finally have enough power for my fridge and laptop without running the generator.

1 week ago

Marcus D., Solar Contractor

★★★★★
Verified

I use SolarCalcPro for quick client quotes on-site. Enter their loads, get panel and battery recommendations instantly. Professional results that close deals faster.

2 weeks ago

Emily R., Engineering Student

★★★★★
Verified

Great learning tool! The reference library explains everything from the photovoltaic effect to wiring configurations. I use it alongside my renewable energy coursework.

2 weeks ago

Robert H., Off-Grid Cabin Owner

★★★★☆
Verified

Sized my entire cabin system with this app — 8 panels, 4 batteries, charge controller, and all the cabling. Everything worked perfectly on the first install.

3 weeks ago

Chris W., Solar Sales Consultant

★★★★★
Verified

When clients ask 'how many panels do I need?' I pull out this app and give them an answer in 30 seconds. The professional results build instant credibility.

1 month ago

Angela T., Master Electrician

★★★★★
Verified

The cable sizing calculator with NEC compliance checks is spot-on. I verify my solar installation wire gauges with this app before every sign-off.

1 month ago

David L., Sustainability Consultant

★★★★★
Verified

Recommend this to all my clients exploring off-grid solutions. The system type comparison guide helps them understand their options before we even start the design phase.

2 months ago

Frequently Asked Questions

Is SolarCalcPro free to use?

SolarCalcPro offers three free calculators: Solar Panel Sizing, Battery Bank, and Daily Load Calculator. Unlock all six calculators and premium features with a SolarCalcPro Premium subscription.

Yes! All calculators and the reference library work completely offline. Perfect for remote site surveys, field work, and areas with limited connectivity.

Our calculators use industry-standard formulas and NEC guidelines. Results include safety margins and professional recommendations to ensure reliable system designs.

SolarCalcPro supports both Imperial and Metric unit systems. Switch between them anytime in Settings.

Yes. All calculations are automatically saved to your history. You can also mark important ones as favorites for quick access.

SolarCalcPro is currently available on iOS. An Android version is planned for the future.

Get in Touch

Have questions or feedback? We'd love to hear from you.

Ready to Design Your Solar System?

Download SolarCalcPro and start calculating today.

Download on App Store