Path-Q Solar

Should I wait to install solar until after replacing inefficient appliances?

Answer

Usually, decide the efficiency upgrades first when they are imminent and likely to materially reduce electricity use; then size solar for the resulting load. If the upgrades will add electric demand, such as replacing combustion equipment with electric equipment, include that future load instead of waiting automatically.

Key points

  • Efficiency can reduce the required solar size and project cost.
  • Electrification can increase load even when the new appliance is more efficient for its service.
  • The best sequence depends on timing, roof work, financing, and how confidently the load change can be estimated.

What it depends on

  • Type, timing, and expected energy effect of appliance changes
  • Current and future electricity use
  • Roof and project timing
  • System sizing and financial assumptions

Risks and trade-offs

  • Waiting can delay savings and may expose the project to changing costs or rules.
  • Installing before a large load reduction can result in excess capacity.
  • Delaying solar until uncertain upgrades occur can also postpone a useful assessment.

Information you may need

  • Appliance replacement plans and energy estimates
  • Current bills and future electric loads
  • Roof condition and project schedule
  • Current and post-upgrade solar scenarios

Your next step

What to do next

Ask for two designs—before and after the appliance changes—and compare total project cost, expected production, and savings using verified current assumptions.

Path-Q

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