Path-Q Solar

How should the operating schedule of a swimming pool pump be factored into a home's solar sizing and daytime self-consumption estimate?

Answer

Treat the pool pump as a potentially useful daytime load: record its power and schedule, then compare its operating hours with expected solar production. Shifting eligible pump operation into daylight can increase self-consumption, but sizing should still reflect the home's full annual load and the pump's seasonal schedule.

Key points

  • Use the pump's actual power draw and run time rather than assuming the nameplate rating equals consumption.
  • Account for reduced or stopped operation during cooler seasons or periods when the pool is unused.
  • Check whether the timer or controls allow safe schedule changes without compromising pool maintenance.

What it depends on

  • Pump power, speed, and run time
  • Seasonal pool-use schedule
  • Solar production by hour and season
  • Other daytime loads
  • Control flexibility and operating requirements

Risks and trade-offs

  • Moving operation to daylight may improve self-consumption but not necessarily reduce total energy use.
  • Oversizing solar around a seasonal pump load can leave excess production outside pool season.
  • A variable-speed pump may have different consumption at different settings.

Information you may need

  • Pump model or measured power use
  • Timer settings and seasonal operating calendar
  • Interval electricity data if available
  • Expected solar production by hour

Your next step

What to do next

Measure or document the pump's seasonal schedule and ask for a sizing estimate with and without daylight load shifting.

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SQ02647