Solar Spotter & PV Calculator

Expressway Apps

Contains adsIn-app purchases

About this app

Solar Spotter & PV Calculator is a complete solar planning and calculation app designed for homeowners, solar installers, engineers, and anyone interested in solar energy.

Whether you're installing a new rooftop solar system or improving an existing setup, this app helps you adjust panel direction, find the right tilt angle, estimate system size, and better understand potential energy production.

Make informed solar decisions using clear data and practical tools.

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☀️ PRECISION SOLAR SPOT & ALIGNMENT

Incorrect panel direction can reduce solar production.

Using device sensors and real-time GPS location data, the app calculates:

• Current orientation (azimuth)
• Tilt angle (inclination)
• Latitude & longitude
• Optimal south-facing direction
• Recommended tilt based on your location

Values update instantly as you move your device.

Better alignment can help improve energy production and reduce potential energy loss over time.

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🌞 SUN PATH & SHADOW TRACKER

Even small shadows can impact panel performance.

Visualize:

• Real-time sun elevation & azimuth
• Sunrise, sunset & solar noon
• Golden hour & twilight timing
• Shadow length & direction

Use satellite map view with location pin and shadow direction indicator to plan better panel placement.

Avoid common installation positioning mistakes.

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🔋 ADVANCED SOLAR & BATTERY CALCULATORS

Plan your solar system with confidence.

Battery Calculator
Estimate required battery capacity using:
• Battery Ah
• Number of batteries
• Load in watts
• Peak sunshine hours

Solar Energy Calculator
Estimate daily solar generation in kWh based on panel performance.

PV Performance Estimator
Calculate:
• Peak power (kWp)
• Mean yearly production
• Optimal orientation & inclination

Pump Power Calculator
Designed for solar water pumping systems using:
• Flow rate (m³/hr)
• Pump head (meters)
• System efficiency (%)
• Motor efficiency (%)

Accurate calculations help you choose the right system size and avoid unnecessary equipment.

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📐 OPTIMAL ANGLE & SOLAR TIME DATA

Solar efficiency depends heavily on correct tilt and timing.

Access:

• Monthly optimal angle recommendations
• Hour angle
• Equation of time
• Solar time correction
• Sunrise & sunset timing

Matching panel tilt to your latitude can help improve annual energy production.

Small angle adjustments can create measurable output differences.

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💰 SOLAR SYSTEM SIZE & COST ESTIMATION

Before installing your solar system, understand your key numbers.

Estimate:

• Required panel capacity (kWp)
• Roof space utilization
• Inverter oversizing factor
• System voltage
• Electricity cost per kWh
• Monthly consumption coverage
• Basic system value estimation

Make data-driven decisions instead of relying on rough estimates.

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📊 SOLAR EFFICIENCY FEEDBACK

Not sure if your panels are aligned correctly?

The built-in efficiency indicator shows:

• Low efficiency (adjustment recommended)
• Maximum efficiency (optimal alignment)

Optimize your setup for improved solar performance.

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🌍 GLOBAL COMPATIBILITY

Works worldwide using accurate latitude and longitude coordinates.

Suitable for:

• Rooftop solar systems
• Off-grid installations
• Solar water pumps
• Residential & small commercial systems
• Renewable energy students & professionals

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🔒 PRIVACY & PERMISSION

This app requires ACCESS_FINE_LOCATION only to calculate accurate solar position, sunrise/sunset timing, and sun path tracking for your area.

Location data is not stored, shared, or sold.

All calculations are estimations based on user inputs and standard engineering assumptions. Actual results may vary depending on installation conditions. Consult a certified professional for final installation decisions.

Download now and plan your solar setup with better clarity and control. ☀️

Ratings and reviews

100% perfect for adjusting the correct direction and angle of solar panels. The app automatically calculates your exact location and displays active figures on the smartphones screen as it's turned and lifted. Exactly what I was looking for! There are ads displayed after each menu selection is made, but they're not intrusive or prevent the app being used normally. I would give it 10 stars. People giving it less don't understand how to use it, or are using antiquated smartphones with no GPS. Thx.

Good and easy application for beginners. Helped me to obtain maximum solar yield from my home solar setup.

The adds are so many and so big that they cover most of the screen so much so that you can't see the accual information and there is no way to close, move or get around the huge adds to see what the app does.

What’s new

- Improve App Performance & Bug Fix.