Path-Q Solar

How should a small business determine whether a solar quote includes testing of power quality for sensitive equipment?

Answer

Do not infer power-quality testing from a general commissioning statement. Ask the installer to identify the measurements, locations, operating conditions, instruments, standards or acceptance criteria, reporting, and corrective obligations included in the quote.

Key points

  • Clarify whether testing covers voltage, frequency, phase balance, harmonics, transients, flicker, and interruptions, as relevant to the equipment.
  • Identify whether measurements occur at the inverter, service entrance, distribution panel, and sensitive equipment connection.
  • Testing should cover relevant operating states, including solar production, major loads, and transitions.
  • The contract should state who investigates and pays for corrective work if results fall outside agreed limits.

What it depends on

  • Sensitivity and manufacturer requirements of connected equipment
  • Electrical design and point of common connection
  • Relevant testing method and acceptance criteria
  • Operating conditions during testing
  • Existing facility power-quality conditions

Risks and trade-offs

  • A standard commissioning test may confirm output without detecting problems affecting sensitive equipment.
  • Power-quality issues may originate in the facility or utility system rather than the solar equipment.
  • Testing adds cost but can reduce production interruptions and troubleshooting uncertainty.

Information you may need

  • Equipment manufacturer power-quality requirements
  • Installer's detailed commissioning checklist
  • Test instruments, locations, duration, and report format
  • Existing power-quality history or incident records
  • Corrective-action and warranty terms

Your next step

What to do next

Request a line-item power-quality testing scope and have the facility's electrical specialist confirm that it addresses the business's sensitive loads.

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SQ03247