Free Farm Solar Calculators

Three independent tools to size, budget, and optimize your solar water pumping system. No signup required. No sponsored content.

Trusted by farmers in Texas, California, and the Midwest

Choose Your Calculator

Each tool is built for a specific decision in your solar pump journey. Pick the one that matches where you are right now.

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Diesel vs Solar ROI

Financial

Compare lifetime costs and find your payback period when switching from diesel to solar pumping. Includes USDA REAP grants and 30% federal tax credit.

  • 20-year cost projection
  • USDA REAP + ITC built in
  • Diesel price escalation model
  • What-if scenarios
Calculate My Savings
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Solar Pump Sizer

Engineering

Calculate total dynamic head, pump horsepower, and solar array size. Basic mode for quick estimates, Advanced mode for full TDH engineering.

  • Basic & Advanced TDH modes
  • DC, AC, and VFD systems
  • System recommendation
  • Budget estimate included
Size My Pump
S

Water vs Battery

Design

Compare the cost of storing water in a tank versus storing energy in batteries for cloudy days and nighttime pumping.

  • 20-year lifecycle cost
  • LiFePO4 vs poly tank
  • Hybrid recommendation
  • Space requirements
Compare Storage

New to Solar Pumping?

Start with our beginner's guide to solar water pumps, then come back and run the numbers. The calculators will make a lot more sense once you understand the basics.

Read the Beginner's Guide
Note: All calculators are for estimation purposes only. Results depend on your specific location, equipment, and installation. Always consult a certified solar installer and tax professional before making investment decisions. Calculators updated for 2026 USDA REAP and federal ITC rates.