Path-Q Solar

Would extending a business's operating hours change the solar system size it should request?

Answer

It could. Longer hours may increase annual electricity use, but the effect on solar size depends on which equipment runs longer and whether the added use occurs during solar-production hours. Extending into evenings can increase consumption without proportionally increasing direct solar use.

Key points

  • Recalculate equipment run time, HVAC, lighting, refrigeration, and process loads.
  • Separate added daytime use from added evening or overnight use.
  • Include the expected schedule change in the initial design if it is reasonably likely.

What it depends on

  • New opening and closing times
  • Equipment that remains active during added hours
  • Seasonal schedule
  • Solar production profile
  • Whether the business expects further growth

Risks and trade-offs

  • Sizing only from current bills may understate future electricity use.
  • Sizing for speculative growth can increase upfront cost and exports.
  • Later operating changes may also affect storage, demand management, or electrical-service needs.

Information you may need

  • Current and proposed operating schedules
  • Loads affected by the added hours
  • Expected growth and occupancy
  • Hourly or interval consumption data if available
  • Planned changes to equipment

Your next step

What to do next

Prepare a future operating schedule and ask for a design comparison using current hours, committed future hours, and a realistic growth case.

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