Construction & Architecture / Solar & Energy
Solar vs Grid 25-Year Cost Calculator
Implementation Specifications
This calculator is planned and documented. The formulas and guidance below are ready for implementation.
Required Inputs
- Solar system cost
- Tax incentives
- Monthly electric bill
- Annual electricity rate increase
- Solar production degradation (0.5%/year)
- Inverter replacement cost (year 15)
- Annual maintenance
Formulas & Calculations
Grid: Year N cost = Monthly bill × 12 × (1 + Rate increase)^N
Grid 25-year total = Σ(Year N costs)
Solar: Initial cost - Incentives + Inverter replacement + (Maintenance × 25)
Solar production Year N = Year 1 production × (1 - 0.005)^N
Grid costs avoided = Σ(Production Year N × Electricity rate Year N)
Total savings = Grid total - Solar total
Status: Specification complete, implementation pending
To implement: Create app/components/calculators/solar-vs-grid-25-year-cost-calculator.tsx and register in app/lib/calculator-registry.ts