Commercial Solar Calculator
Commercial solar calculator with research-backed O&M costs at $17 per kW per year, 7% APR, and 3.5% utility rate increases
Estimate your savings with accurate, research-backed calculations.
You set these
94 kW
10%
$3,000
90%
10 yrs
Locked averages
Loan APR avg
7.00%
Utility increase/yr avg
3.5%
O&M rate NREL avg
$17/kW-yr
Cost per watt avg
$1.65/W
Auto-calculated system and maintenance
| Estimated system cost | $155,100 |
| Estimated panels (~440W each) | 214 panels |
| Annual O&M ($17/kW-yr) | $1,598/yr |
| Monthly O&M | $133/mo |
Loan breakdown
Down payment
$15,510
Loan amount
$139,590
Monthly loan payment
$1,621
Total interest paid
$54,930
Monthly cash flow
During loan: total monthly cost
$2,054
$1,621 loan + $133 O&M + $300 remaining bill
During loan: monthly savings vs utility
$946
Payback and return
True breakeven
1 yrs 4 mo
After loan: monthly savings
$3,676
25-year cumulative cost
Without solar (3.5%/yr increase)With solar (loan + O&M + remaining bill)
25-yr utility cost
$1,402,195
25-yr solar cost (all-in)
$390,199
25-yr net savings
$1,011,995
ROI
652%
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