☀️ Solar Panel Calculator PRO
Estimate system size, energy output, savings, and payback period for solar panel installations.
Dimension Diagram — updates as you type
Roof face with panel layout. Usable area after pitch and shading decides the panel count.
1 Roof Dimensions
Angle affects usable area via cos(angle). 0° = flat, 45° = steep.
2 Panel Specifications
3 Environment & Cost
Average peak sun hours. 4-5 hrs typical, 6-7 in desert climates.
Results
Roof Analysis
System Specifications
Energy Output
Savings & ROI
Cost Breakdown
⚠️ Pre-Export Checklist
- Roof dimensions verified on-site
- Roof structural capacity confirmed for panel weight
- Shading from trees/neighboring buildings assessed
- Local solar permits and HOA requirements checked
- Utility net metering policy confirmed
- Electrical panel capacity verified
- Panel and inverter warranty terms reviewed
Professional Solar Estimation Guide
📐 Formulas & Calculations ▼
Usable Roof Area
UsableArea = Length × Width × cos(angle) × 0.85 (shading factor)
The shading factor accounts for obstructions, setbacks, and orientation losses. Adjust your roof angle to see the impact on usable area.
Panel Count
Panels = UsableArea ÷ PanelArea
Each panel is roughly 17-18 sq ft. A typical 5kW system needs 12-15 panels.
Annual Output
Annual = SystemSize(kW) × SunHours × 365
Output varies by location. 4 sun hours/day is average US, 6+ in Southwest.
Payback Period
Payback = TotalCost ÷ AnnualSavings
Most residential systems pay back in 6-12 years with 25-30 year panel life.
💡 Pro Tips ▼
- South-facing roofs produce 15-25% more energy than east/west in the Northern Hemisphere.
- Micro-inverters are better for partially shaded roofs; string inverters for unshaded arrays.
- Battery storage adds 30-50% to system cost but provides backup power during outages.
- Federal tax credits can offset 30% of total cost — check current incentives in your area.
- Net metering policies vary by utility — confirm buyback rates before calculating savings.
Solar Installation — 3D Preview
Drag to rotate — Scroll to zoom
İlgili Hesaplayıcılar
Frequently used together on the same project.
Client & Quote (prints on PDF & Excel)
Adjustments (applies to exports)
Contingency is added as a separate line on the exported cost summary. Waste % is printed as an advisory reminder.
Project notes (prints on PDF & Excel)
Result compare (A/B)
| Item | Pinned | Current | Change |
|---|---|---|---|
Saved rates auto-apply from your Price Library. Advanced details stay in your browser — nothing is uploaded except inside your own PDF/Excel exports.
📖 Güneş Paneli Hesaplayıcısı Nasıl Kullanılır
Ortalama aylık elektrik tüketiminizi girin.
Konumunuzu seçin veya pik güneş saatlerini girin.
Kurulacak panel wattajını seçin.
Bölgenizdeki watt başına maliyeti girin.
Hesapla'yı tıklayın.
Detayları inceleyin.
📐 Güneş Enerjisi Formülleri
⚠️ Yaygın Hesaplama Hataları
Gelecekteki fiyat artışlarını hesaba katmamak.
Gölgeleri göz ardı etmek.
Çatı durumunu ve yönünü atlamak.
İnvertör verimlilik kayıplarını hariç tutmak.
Tüm maliyetleri dahil etmemek.
💡 Profesyonel İpuçları
Profesyonel site değerlendirmesi alın.
Pil depolamayı düşünün.
Çoklu teklifler alın.
Mevcut teşvikleri kontrol edin.
Çatı durumunu sağlayın.
Orientasyon ve eğimi düşünün.
Düzenli olarak izleyin.
❓ Sıkça Sorulan Sorular
Tüketime bağlıdır. Tipik bir ev için 20-25 panel gerekir.
Ortalama maliyet watt başına 2,50-3,50 dolardır. 6kW sistem teşvik öncesi 15.000-21.000 dolar.
Çoğunun 25-30 yıl garantisi vardır.
Evet, daha düşük verimlilikle elektrik üretir, tipik olarak %10-25.
Minimal bakım: zaman zaman temizlik ve yıllık denetimler.
🏗️ Gerçek Dünya Kurulumları
Güneş paneli hesaplayıcımızı kullanarak doğru sistem boyutu ve maliyetleri belirleyin.
✅Method, Sources & Review
Maintained by theBuildingCalc methods desk· Last reviewedSeptember 23, 2026. This calculator implements the standards and references below; every figure can be rechecked against the formulas and worked example on this page.
Results are estimates, not engineering advice. Verify against local codes and licensed professionals for structural, electrical, and gas work. See ourTerms. Spotted an error? Report it— corrections ship with the next review.