Close the feedback loop

Compare solar estimates with real results

A forecast becomes more useful when it can be audited. Compare predicted production and savings with monitoring and utility-bill data from the same period, then keep a portable record.

Tool updated October 7, 2026. Supports monthly CSV evidence and explicit missing-data warnings. Uploaded records stay in your browser and are not automatically published.

Runs in your browser

Estimate accuracy check

Compare a proposal or Wattcrunch estimate with monitoring and bill results over the same period.

Comparison period

Estimated production (kWh)Actual production (kWh)Estimated bill savings ($)Actual bill savings ($)

Production error

Enter both estimate and actual

Savings error

Enter both estimate and actual

Validate month by month

Monthly records reveal seasonal bias that annual totals hide. Upload a CSV with month (YYYY-MM), estimated_kwh, actual_kwh, estimated_savings_usd, actual_savings_usd. Savings may be negative; missing values are never treated as zero.

Monthly validation CSVEvidence and normalization notesI have permission to publish these anonymized records and have removed personal data. This declaration is included in the download; it does not publish or verify a case study.

Your values stay in this browser and are not submitted to Wattcrunch. Normalize partial-year comparisons for weather and use the same billing period before drawing conclusions.