Solar Estimator

DevByDesign

About this app

Tired of overpaying for electricity? Take control with Solar System Cost Calculator — a powerful offline solar sizing tool built specifically for Pakistan.

Simply enter your monthly electricity usage (kWh), required backup hours, and your current electricity rate. The app instantly calculates and prices a complete solar system tailored to your needs.

☀️ SOLAR PANELS

Choose from a pre-loaded catalogue of real solar panels from leading manufacturers:

• LONGi Solar
• Jinko Solar
• JA Solar
• Trina Solar
• Canadian Solar
• Astro Energy

The app supports P-type and N-type modules from 540W to 610W.

Panel quantity is calculated using:

• Your daily energy demand
• 5.5 peak sun hours
• 15% real-world system loss correction

🔋 BATTERY BANK

Select from high-quality LiFePO4 batteries from:

• Inverex
• Pylontech
• Narada
• Crown
• Exide

Available battery configurations include:

• 25.6V
• 48V
• 51.2V

Battery quantity is calculated using:

• Backup hour requirement
• Battery voltage
• Depth of discharge
• Charge efficiency

⚡ INVERTER SELECTION

Browse hybrid and on-grid inverters from trusted brands:

• Inverex
• Knox
• Growatt
• Fronus
• Huawei
• Solis

Supported inverter sizes:

• Single-phase and three-phase models
• Capacity from 3 kW to 12 kW

The app automatically warns you if the selected inverter is undersized for your system.

💰 FULL COST BREAKDOWN

Get a complete financial overview including:

• Itemised cost for panels
• Battery bank cost
• Inverter cost
• Earthing and installation estimate

Includes a visual pie chart showing percentage cost distribution.

All pricing is displayed in Pakistani Rupees (PKR).

📈 ROI & PAYBACK ANALYSIS

Understand the financial return of your solar investment:

• Estimated annual energy generation
• Annual savings based on your electricity rate
• Payback period in years
• Return on investment (ROI %)

🌱 WHY THIS APP?

✅ Works 100% offline — no internet required
✅ Pre-loaded with real market prices in PKR
✅ Covers the most popular solar brands in Pakistan
✅ Uses engineering-grade solar formulas
✅ No account required
✅ No ads, no tracking, no data collection
✅ Completely free to use

What’s new

Third release of Solar System Cost Estimator.

Features:
• Calculate solar system size based on monthly electricity usage
• Automatic solar panel quantity calculation
• Battery bank sizing based on backup hours
• Inverter size recommendation with safety margin
• Complete system cost breakdown in PKR
• ROI and payback period analysis
• Preloaded database of solar panels, batteries, and inverters
• Clean and modern solar-themed interface
• Works 100% offline with no data collection