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Running a Pool Pump on Solar: The Math That Works
Pool pumps are big steady loads — often the best candidate to run on solar surplus. How to time and size so the pool is basically free to run.
WaterFuelAndSolarEnergy.com Editorial Team Updated December 2024 7 min read
A pool pump can draw 1–2 kW and run hours every day — a large, predictable load that often overlaps perfectly with solar output. Timing it into solar hours is one of the simplest high-value moves for a solar home.
- Single-speed pumps waste power; variable-speed pumps use far less
- Run filtration during peak solar hours, not at night
- A timer or smart relay automates this with zero daily effort
- Pair with a battery if you want overnight savings too
Rough daily cost comparison (illustrative)
| Setup | Daily pump load | Solar-covered share |
|---|---|---|
| Night run, no solar match | ~3–6 kWh | 0% |
| Solar-hours run | ~3–6 kWh | High (sunny days) |
| Variable-speed + solar timing | ~1.5–3 kWh | High |
Can I run my whole pool on solar alone?
In many sunny regions, yes for the pump — especially variable-speed. If you also heat the pool, a heat-pump heater running on solar hours is the efficient pairing.