Pool Pump Running Cost: kWh, Schedule and Savings

Use:

• Daily kWh = pump input kW x daily runtime
• Daily cost = daily kWh x electricity rate
• Monthly cost = daily cost x operating days

If a pump draws 1.2 kW and runs 8 hours per day, it uses 9.6 kWh/day. At $0.18/kWh, that is $1.73 per day or about $52 for a 30-day month. Use measured input watts when possible. Horsepower is not the same as electric input because motor efficiency, service factor, plumbing resistance, and pump speed change the draw.

A single-speed pool pump runs at one speed whether the pool needs that much flow or not. That makes the timer schedule a major bill lever. Start with the current timer:

Do not copy a generic schedule without checking water clarity, sanitation, local conditions, and equipment requirements.

Variable-speed pumps can reduce energy use because moving water at lower speed for longer can be more efficient than pushing high flow at one speed. The right comparison is not just pump price. It is:

• Current pump kWh per day
• Proposed pump kWh per day at the programmed speeds
• Installed cost or net upgrade cost
• Expected operating months
• Electricity rate and time-of-use windows

If the current pump is old, loud, oversized, or near failure, the replacement decision may be stronger than the energy-only payback. If the pump is new and runtime is already low, the case may be weaker.

Pool pumps often run during daylight. That can make them a useful load for rooftop solar because pump runtime can overlap solar production. Before changing solar size, use this order:

1. Estimate pool pump kWh with the Energy Consumption Calculator.
2. Move flexible pump runtime away from peak grid-rate windows where practical.
3. Compare daytime pump kWh with expected solar production.
4. Use the Solar ROI Calculator only after the pump schedule is realistic.

This avoids sizing solar around an inefficient timer that you may change later.

Do not reduce runtime blindly. The pump supports filtration, circulation, heating, and chemical distribution. Changes should keep water safe and clear. Also check non-electric constraints:

• Filter pressure and cleaning schedule
• Pipe layout and head loss
• Pump age and noise
• Local pool-service recommendations
• Whether a heater, cleaner, or water feature needs specific flow

A lower bill is not a win if the result is poor circulation or higher maintenance cost.

Use a clamp meter, smart plug rated for the load, pump controller data, or manufacturer documentation to estimate input watts. Then calculate three scenarios:

1. Current timer and current pump
2. Shorter or shifted timer with the current pump
3. Variable-speed schedule if replacement is already under consideration

The best first move is usually schedule visibility. Once pump kWh is visible, solar sizing, battery sizing, and equipment replacement decisions become cleaner.