Path-Q Solar

Should I include electricity used by a detached workshop when sizing solar?

Answer

Include the workshop's consumption if it is supplied through the same electrical account and meter, or if the project will legally and technically combine the loads. If it has a separate account or meter, it generally needs separate analysis and may require a separate system or interconnection.

Key points

  • The key issue is whether workshop consumption appears on the same account and can be served by the proposed system.
  • Include seasonal and occasional workshop loads, not just the connected equipment nameplates.
  • Large motors, welders, compressors, or heating equipment can affect inverter and service requirements as well as annual energy use.
  • A detached building may require separate wiring, equipment, or permitting review.

What it depends on

  • Whether the workshop is on the same meter and account
  • Distance and electrical connection between buildings
  • Workshop equipment and operating schedule
  • Whether backup power is also desired
  • Site and interconnection requirements

Risks and trade-offs

  • Ignoring the workshop can understate system size and expected savings.
  • Including loads that are not actually connected to the account can overstate the system need.
  • High-power intermittent equipment may require electrical upgrades even if annual energy use is modest.

Information you may need

  • Utility account and meter arrangement
  • Workshop equipment list and estimated operating hours
  • Monthly or interval consumption if available
  • Existing feeder capacity and distance between buildings

Your next step

What to do next

Confirm whether the workshop is on the same meter, then provide its equipment list and usage schedule for a combined load review.

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