About · Data Sources — Solar Payback Calculator
About This Tool
The Solar Panel Payback Calculator is a static web tool that instantly computes solar investment payback periods and 25-year cumulative savings for Korean residential and commercial installations. No login required. All calculations run in your browser — input data is not sent to any server.
- Operated by: bal.pe.kr (comsamo84@gmail.com)
- Tech: React 19 + TypeScript + Vite + Tailwind CSS
- Deployment: AWS S3 + CloudFront
Data Sources
- Regional insolation: Korea Meteorological Administration KHIS (2021–2025 average peak sun hours)
- Installation cost (180 万KRW/kW): Ministry of Trade, Industry and Energy gazette + KNREC reference pricing (2026)
- Electricity rate (140 KRW/kWh): KEPCO residential tariff (2026 progressive tier average)
- Efficiency (80%): Temperature loss 10% + inverter 5% + wiring/other 5%
- Subsidy (10–50%): KNREC Renewable Energy Dissemination Program (2026)
- Panel lifetime (25 years): IEC 61215 standard and manufacturer performance warranty
Disclaimer
This tool provides reference calculations only. Actual payback depends on panel orientation, shading, weather, panel degradation, and future electricity tariff changes. Always obtain multiple quotes from KNREC-registered installers before making investment decisions. bal.pe.kr assumes no liability for investment decisions based on these calculations.