Path-Q Solar

Can solar offset electricity use from a workshop or detached building?

Answer

Often, if the workshop or detached building is electrically connected in a way that allows the solar system's output to serve its loads. If it has a separate meter, service, or utility account, whether one system can offset both loads depends on the electrical arrangement and applicable interconnection and billing rules.

Key points

  • Loads on the same connected electrical system can generally be included in the combined consumption analysis.
  • A separate building may need adequate feeder capacity, wiring, and protective equipment.
  • Separate meters or accounts can change whether energy is treated as serving the same premises.
  • The workshop's tools, heating, compressors, and intermittent loads may affect peak demand.

What it depends on

  • Electrical connection between the buildings
  • Metering and utility-account arrangement
  • Workshop equipment and operating schedule
  • Feeder, panel, service, and solar-system capacity

Risks and trade-offs

  • Long feeders can add cost and electrical losses.
  • Intermittent high-power tools may require capacity beyond annual energy needs.
  • A separate service may require a distinct design or approval path.

Information you may need

  • Single-line or electrical connection details
  • Meter and account configuration
  • Workshop equipment ratings and usage
  • Building distance, feeder capacity, and proposed solar location

Your next step

What to do next

Have an electrician and solar designer review the metering and connection arrangement, then model the combined loads before assuming the workshop can be offset.

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Some details may depend on your location, installer, utility, incentives, regulations, or specific property.

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