What this tool does
Make the schedule, electrical input and tariff assumptions behind a simple one-year and five-year operating-cost comparison explicit.
When to use it
Use it with measured or credible electrical input at the duty condition. For flow/head scenarios, first estimate electrical input with the power calculator.
Inputs and supported units
Each labelled field explains the quantity it expects. Unit-system changes convert existing numeric entries once and keep calculations on a single SI internal basis. Supported shared units include L/min and GPM, metres and feet, kPa and psi, millimetres and inches, kW and hp, and °C and °F as relevant.
Calculation or decision method
Annual total = annual kWh × tariff + annual maintenance
How to interpret the result
Read the primary result with the supporting breakdown and warning. A plausible number is not evidence that every input, operating case or design constraint has been included.
Worked example
A 4 kW scenario operating 8 hours/day for 300 days uses 9,600 kWh/year. At 0.15 currency units/kWh, electricity is 1,440 currency units/year.
Assumptions
Entered power and schedule are representative; tariff is a single user-entered energy rate; maintenance is annual.
Limitations
No demand charge, tariff tier, inflation, discount rate, purchase cost, downtime or replacement timing is included.
Sources
- U.S. Department of Energy — Pump Systems
- U.S. Department of Energy — Pumping System Assessment Tool User’s Manual
- Hydraulic Institute — Combined Pump & System Curves