Path-Q Solar

How should a business verify whether its solar system is delivering the expected energy production and bill savings?

Answer

A business should reconcile measured solar production, site consumption, exported or imported energy where applicable, and electricity bills against the original design and financial assumptions for comparable periods.

Key points

  • Separate solar production from total facility consumption.
  • Compare actual output with weather-adjusted expectations and account for downtime, shading, soiling, and curtailment.
  • Check bill line items, demand charges, time-based charges, export treatment, and other charges rather than comparing only total bill amounts.

What it depends on

  • Production and interval data
  • Business load profile
  • Utility bill structure
  • Original production and savings assumptions

Risks and trade-offs

  • A lower bill does not prove the system met its production target, and high usage can mask savings.
  • Changes in operating hours, tariffs, rates, or demand can change savings independently of solar output.
  • Metering or monitoring errors can distort the reconciliation.

Information you may need

  • Solar production data
  • Interval consumption and meter data
  • Bills before and after installation
  • Original proposal assumptions and system downtime

Your next step

What to do next

Build a monthly reconciliation that compares production, consumption, bill components, and assumptions, then ask the installer or utility for clarification on unexplained differences.

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