Path-Q Solar

How should a small business size solar when its operating hours may change next year?

Answer

Size the design using a documented range of current and expected operating schedules rather than current annual consumption alone. Identify which loads change with hours, distinguish energy use from peak demand, and compare an immediate system with a design that preserves room for future expansion.

Key points

  • Model production against the hours when the business is open and equipment operates.
  • Include planned changes in staffing, equipment, refrigeration, HVAC, and production volume.
  • Daytime operation can increase direct solar use, but extended hours may also increase total energy demand.
  • Consider whether the future change is probable enough to justify installing additional capacity now.

What it depends on

  • Current bills and interval load data
  • Expected operating hours and days
  • Equipment and production changes
  • Roof and electrical capacity
  • Expansion or interconnection constraints

Risks and trade-offs

  • Sizing only to current use can miss a known expansion.
  • Sizing to an uncertain forecast can tie up capital in underused capacity.
  • A change in operating schedule can alter self-consumption and savings even if annual energy use stays similar.

Information you may need

  • At least one year of bills, preferably interval data
  • Current and projected operating schedules
  • Planned equipment or production changes
  • Peak-load information
  • Roof, service, and expansion limits

Your next step

What to do next

Request low, expected, and high operating-schedule scenarios with production, self-consumption, system size, and expansion options shown for each.

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