Path-Q Solar

Which planned changes in electricity use should I account for before accepting a solar system design?

Answer

Account for planned electric vehicles, heat pumps, electric water heating, induction cooking, pool or spa equipment, home additions, electrification of appliances, business expansion, and changes in occupancy or operating hours. These changes can materially alter the appropriate system size and, where relevant, storage needs.

Key points

  • Estimate when each new load will begin and how often it will operate.
  • Separate loads that may be shifted to sunny hours from loads that require evening or backup coverage.
  • Ask for designs based on current use and credible future-use scenarios rather than an unsupported maximum.

What it depends on

  • Timing and size of planned loads
  • Current consumption profile
  • Desired backup coverage
  • Roof, electrical, and budget constraints

Risks and trade-offs

  • Oversizing for uncertain future use can increase cost without equivalent value.
  • Undersizing before electrification may require later changes that are more expensive or constrained.

Information you may need

  • Current bills or interval usage
  • Planned equipment capacities and schedules
  • Occupancy or business changes
  • Backup and future expansion goals

Your next step

What to do next

Create a dated list of likely load changes and ask installers to show how each scenario affects system size, production, and storage recommendations.

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