Path-Q Solar

How should a recent change in household size affect a solar quote?

Answer

A recent household-size change should be reflected by separating temporary past usage from the consumption you expect to continue. Ask for a quote based on actual recent data and another based on a credible future-use forecast rather than blindly using one unusual billing year.

Key points

  • A full year of bills is a starting point, but it may no longer represent the household.
  • Identify which loads changed with the household size and which are independent of occupancy.
  • Expected future residents, work-from-home patterns, EVs, and electric heating can materially change demand.
  • The quote should show modeled production and expected grid purchases under the forecast.

What it depends on

  • Whether the household change is temporary or permanent
  • Annual and seasonal consumption before and after the change
  • Future appliances, vehicles, and heating choices
  • Time of day when the changed loads occur

Risks and trade-offs

  • Sizing only from high historical use can oversize the system if the change is permanent.
  • Sizing only from unusually low recent use can understate future needs.
  • A forecast is uncertain, so assumptions should be documented and tested with alternatives.

Information you may need

  • At least 12 months of pre-change and post-change usage where available
  • Expected occupancy and major appliance changes
  • Planned electrification or EV charging
  • Roof and site constraints

Your next step

What to do next

Prepare a written future-load assumption and request a quote comparing current-use and expected-use system sizes.

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