Commercial Solar ROI Calculator

Comprehensive financial analysis for business solar investments.

System Size (kWp)

Total Project Cost ($)

Annual Production (kWh)

Electricity Rate ($/kWh)

Federal Investment Tax Credit (ITC) IRA provides 30% base + potential adders

MACRS Depreciation

Federal Tax Rate (%)

State Tax Rate (%)

State/Utility Incentives ($)

Annual O&M ($/kW)

Electricity Escalation (%/yr)

Discount Rate (%)

Analysis Period (years)

Results

Net Present Value (NPV)

Gross Project Cost -

Federal ITC Value -

Depreciation Value (NPV) -

State Incentives -

Net Investment -

Year 1 Savings -

Lifetime Savings -

Lifetime O&M -

Net Lifetime Benefit -

Simple Payback -

Discounted Payback -

Internal Rate of Return -

Return on Investment -

Cost per Watt (gross) -

Cost per Watt (net) -

LCOE -

Key Financial Metrics


                        Net Cost = Gross - ITC - Depreciation Value - Incentives

                        NPV = Sum of discounted cash flows - Net Investment

                        IRR = Rate where NPV = 0

                        LCOE = Lifetime Cost / Lifetime Production

5-Year MACRS Schedule

Year	Rate	Notes
1	20%	First year
2	32%	Peak depreciation
3	19.2%
4	11.52%
5	11.52%
6	5.76%	Final year

*Depreciation basis reduced by 50% of ITC claimed