Your Current Setup
Current price at your local pump
$/gallon
How many gallons your pump burns per day
gallons/day
Season length (e.g., 180 for irrigation season)
days/year
Engine service, parts, repairs
$/year
Solar System Details
Pump + panels + installation + wiring
$
Up to 50% of project cost (25% typical)
30% through 2032 for solar
Panel cleaning, inverter check, pump service
$/year
Annual % increase in diesel price
%/year
Pump life before replacement
years
Cost to replace pump only (not full system)
$
How many years to project
Your Results
--
Net Solar Cost
(after incentives)
--
Payback Period
--
Annual Savings
(Year 1)
--
Total Savings
(20 years)
Lifetime Cost Comparison
Diesel Only
$0
Solar (Net)
$0
Your Savings
$0

Current Annual Diesel Cost

--
Fuel + maintenance, Year 1

Incentives Received

--
REAP grant + federal tax credit

Diesel Cost in 10 Years

--
With escalation applied

Pump Replacement

--
At year 12
Year-by-Year Breakdown
YearDiesel CostSolar CostAnnual SavingsCumulative SavingsNet Position
What If Scenarios

If Diesel Hits $5/gal

--
Payback period

If Diesel Stays at $3/gal

--
Payback period

Without Any Grants

--
Payback period

With 50% REAP

--
Payback period
Key Assumptions:
Solar panels last 25+ years with 0.5% annual degradation. Diesel engine requires annual maintenance increasing with age. Inflation on diesel applies yearly; solar has near-zero fuel cost. Federal ITC (30%) is a tax credit, not a deduction. REAP grants are competitive; apply early through your USDA state office.
Disclaimer: This calculator provides estimates for planning purposes only. Actual costs and savings vary by location, installer, equipment, and usage patterns. Consult a certified solar installer and tax professional before making investment decisions.