Solar PV Calc - Solar Designer

Solar PV Calc is a FREE professional solar power system designer and calculator.

Used by homeowners, solar installers, and engineers to size complete off-grid and

backup solar systems using real engineering formulas.

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⚡ WHAT YOU CAN CALCULATE

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✓ Solar panel array size (Wp) from daily energy needs

✓ MPPT charge controller amperage (sized by array, not load)

✓ Pure sine wave inverter sizing with 25% safety margin

✓ Battery bank capacity (Ah) at 50% depth of discharge

✓ DC & AC circuit breaker ratings

✓ PV string fuses and surge protection devices (SPD)

✓ Complete safety equipment list

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🔧 KEY FEATURES

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✓ Add household appliances with wattage, voltage & daily hours

✓ 12V / 24V / 48V DC system support

✓ Automatic current calculation (I = W/V)

✓ Professional wiring diagrams

✓ Complete materials shopping list with quantities

✓ Step-by-step installation guide

✓ Financial ROI calculator — payback period & 25-year savings

✓ Cable sizing & panel angle calculator (Advanced Tools)

✓ Calculation history — save and compare multiple system designs

✓ Environmental impact — CO₂ saved and trees equivalent

✓ 100% offline — works without internet connection

✓ All data saved locally — no account required

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📐 REAL ENGINEERING FORMULAS

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• Daily Energy (kWh) = Σ(Watts × Hours) / 1000

• Solar Array (Wp) = Daily kWh / (Peak Sun Hours × 0.75)

• Inverter (W) = Total Load × 1.25

• MPPT Controller (A) = Array Wp / Battery V × 1.25

• Battery Bank (Ah) = Daily Wh / (System V × 0.50)

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🌏 DESIGNED FOR THE PHILIPPINES

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• 5 peak sun hours (Philippine average)

• 230V AC, 50Hz standard output

• 550Wp monocrystalline panel sizing

• MPPT models available in the Philippine market

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⭐ PRO VERSION (OPTIONAL)

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Go PRO with a single one-time purchase to enjoy a completely

ad-free experience. All features remain free — PRO only removes ads.

Built by DarskeeWorks — solar engineering meets mobile technology.

Note: This app provides educational estimates for planning purposes.

Always consult a certified solar installer before any actual installation.