Calculator Inputs
Use the grid below. Large screens show three columns.
Example Data Table
This sample helps verify the calculator quickly.
| Example Item | Value | Example Item | Value |
|---|---|---|---|
| Fixtures | 24 | Annual Hours | 1200 |
| Existing Wattage | 1500 W | LED Wattage | 900 W |
| Electricity Rate | $0.18/kWh | Demand Charge | $14.00/kW/month |
| Annual Energy Saved | 20,390.40 kWh | Annual Total Savings | $11,005.63 |
| Net Project Cost | $19,920.00 | Simple Payback | 1.81 years |
Formula Used
Connected Load (kW) = Number of Fixtures × Fixture Wattage ÷ 1000
Annual kWh = Connected Load × Annual Operating Hours
LED kWh after controls = LED kWh before controls × (1 − Controls Savings %)
Annual Energy Cost Savings = (Existing kWh − LED kWh) × Electricity Rate
Annual Demand Savings = Peak Demand Reduction × Demand Charge × 12
Total Savings = Energy Savings + Demand Savings + Maintenance Savings
Net Project Cost = Gross Installed Cost − Total Rebates
Simple Payback = Net Project Cost ÷ Annual Total Savings
NPV = −Initial Cost + Sum of discounted annual savings
How to Use This Calculator
- Enter the number of baseball field fixtures being replaced.
- Add the existing fixture wattage and new LED wattage.
- Enter yearly runtime, utility rate, and any demand charge.
- Add expected annual maintenance costs for both systems.
- Enter installed cost, rebate value, controls savings, and discount rate.
- Choose the analysis period in years.
- Press Calculate Savings to show results above the form.
- Download the report using CSV or PDF buttons.
FAQs
1) What does this calculator estimate?
It estimates yearly energy savings, maintenance savings, demand savings, total project cost, simple payback, ROI, NPV, and cumulative cash flow for baseball field lighting upgrades.
2) Why does annual operating time matter so much?
Operating time directly affects annual kilowatt-hour use. More runtime means larger energy bills. High-use sports facilities usually show faster payback from efficient fixtures.
3) What is the peak coincidence factor?
It estimates how much lighting demand overlaps with utility billing peaks. Lower values reduce demand savings. A value near 1 means strong overlap with peak demand periods.
4) Why include maintenance savings?
Older sports lighting often needs lamp replacement, aiming, ballast service, and lift access. LED systems typically reduce those recurring costs, which can materially improve project economics.
5) What does controls savings represent?
Controls savings models extra energy reduction from dimming, scheduling, zoning, occupancy logic, or practice-mode settings. It lowers LED energy use beyond simple wattage reduction.
6) Is simple payback enough for decisions?
Simple payback is helpful, but it ignores the time value of money. NPV and cumulative cash flow provide a stronger long-term investment view.
7) Can rebates change the result significantly?
Yes. Rebates reduce the upfront project cost immediately. Strong utility incentives often shorten payback and raise first-year ROI noticeably.
8) Should I use fixture input wattage or system wattage?
Use the best available real system wattage. That usually includes drivers and practical operating power, which produces more reliable savings estimates.