Calculate PV system availability (uptime) from downtime hours, distinguishing planned vs. unplanned outages.
Input Parameters
Results
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Total Availability
%
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Technical Availability
%
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Equivalent Full Downtime
hours
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Energy Availability
%
Note: Availability is key for PPA and O&M contracts. Industry target is >98% for utility-scale, >99% for commercial. Track planned vs. unplanned separately for O&M optimization.
Reference
Equiv Downtime = Planned + Unplanned + Partial×Severity
Total Availability = (Total − Downtime) / Total × 100
Technical Avail = (Total − Unplanned − Partial) / (Total − Planned)
Energy Avail adjusts for daylight weighting
Target: >98% for utility-scale PV