Path-Q Solar

When should I ask an installer to model multiple electricity-use scenarios instead of one forecast?

Answer

Ask for multiple scenarios whenever future electricity use is uncertain or likely to change materially. This is particularly important before adding electric heating, cooling, vehicles, batteries, major appliances, home additions, or changes in occupancy.

Key points

  • Request at least a current-use case and realistic higher- and lower-use cases.
  • Include timing of use, not just annual consumption, because solar production and demand may occur at different times.
  • Ask how each scenario changes system size, self-consumption, export, storage value, and electrical-service needs.
  • Require the installer to identify assumptions rather than presenting one forecast as certain.

What it depends on

  • Planned changes in occupancy or equipment
  • Hourly or seasonal demand pattern
  • Solar design and potential battery operation
  • Uncertainty in future energy behavior

Risks and trade-offs

  • A design optimized for high future use may be underused if plans change.
  • A design based only on current use may become undersized and costly to expand.
  • More scenarios add complexity but reduce the risk of making a decision from a fragile forecast.

Information you may need

  • Recent bills or interval usage data
  • Planned appliances, heating, vehicles, and building changes
  • Expected timing of those changes
  • Preferences for cost, bill reduction, export, and resilience

Your next step

What to do next

Provide the installer with a written list of likely load changes and request a side-by-side scenario report with assumptions and design consequences.

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