☀️ 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
관련 계산기
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.
📖 태양광 패널 계산기 사용 방법
평균 월간 전력 소비량을 입력합니다.
위치 또는 피크 일조 시간을 선택합니다.
설치할 패널 와트수를 선택합니다.
지역의 와트당 비용을 입력합니다.
계산을 클릭합니다.
세부 사항을 확인합니다.
📐 태양광 공식
⚠️ 일반적인 계산 실수
미래 요금 인상을 고려하지 않음.
그림자를 무시함.
지붕 상태와 방향을 무시함.
인버터 효율 손실을 고려하지 않음.
모든 비용을 포함하지 않음.
💡 전문 설치 요령
전문 사이트 평가를 받으세요.
배터리 저장을 고려하세요.
여러 견적을 받으세요.
이용 가능한 인센티브를 확인하세요.
지붕 상태를 확인하세요.
패널 방향과 경사각을 고려하세요.
정기적으로 시스템 성능을 모니터링하세요.
❓ 태양광 패널 FAQ
소비량에 따라 다릅니다. 평균 가정에는 약 20~25개의 패널이 필요합니다.
평균 비용은 와트당 $2.50~$3.50입니다. 6kW 시스템은 인센티브 전 $15,000~$21,000입니다.
대부분 25~30년 보증이 있습니다.
네, 효율은 낮아지지만 전기를 생산합니다. 보통 10~25% 출력입니다.
최소한의 유지보수: 주기적 세척과 연간 점검.
🏗️ 실제 설치 예
태양광 패널 계산기를 사용하여 적절한 시스템 규모, 패널 수, 비용을 결정하세요.
✅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.