Construction & Architecture / Solar & Energy
Solar vs Grid 25-Year Cost Calculator
Current Electric Bill
Solar System
Analysis Notes
Assumptions: 3% annual electricity rate increase, 0.5% panel degradation, 30% federal tax credit, $200/year maintenance
Not Included: State incentives, SRECs, home value increase, backup power value
Use this solar vs grid 25-year cost calculator to compute solar & energy results from your inputs.
Formula
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