Residential Roofing Integrated Photovoltaic Installation Time Observations in California

A collection of 21 field observations of residential roofing integrated photovoltaic installations in California, with 2 observations for re-roofing projects and 19 for new construction projects. It documents detailed time and motion data for installation activities collected between July 2021 and June 2022 by the Department of Energy.

Use Cases

• Analyze total installation time differences between re-roofing and new construction project categories.
• Compare time stamps for specific installation activities like rough wiring and final electrical wiring processes.
• Study crew break durations captured during each installation day or step.
• Examine project and crew characteristics, product information, and inspection data recorded in Part 1 of the forms.

Strengths

• Provides 21 detailed field observations of real-world installation processes.
• Captures data in multiple time units: total mins, total hours, person mins, and person hours.
• Data collection is structured into defined form parts for project characteristics, time stamps, and crew information.

Limitations

• Very small sample size of only 21 observations limits statistical power and generalizability.
• Data is limited to installations in California, which may not represent practices in other regions.
• The description notes the data was reviewed but may not be comprehensive, indicating potential gaps.

Provenance

Source

Department of Energy, National Renewable Energy Laboratory (NREL).

Collection Method

Field observations captured using structured time and motion forms during installations.

Time Range

July 2021 to June 2022.

Freshness

Data covers July 2021 to June 2022; metadata was last updated in March 2026.

Geography

California, United States.