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Health

Friday, August 21, 2026

The array ran at 52% of normal for the sunlight; about 47 kWh lost; low for 1 h 15 min in strong sun.

Incident23.3 kW array · 5.5 kWh/m² of sunlight
Made61.6kWhwhile the sensor had readings
Expected for the sunlight109kWhat this array's 30-day normal
Shortfall47.0kWhlost to the fault
Peak8.8kW38% of the array's kW; air up to 100°F

Power · kW

  • Solar
  • House
  • Expected for the sunlight
051015208 AM10 AM12 PM2 PM4 PM6 PM8 PM

Sunlight · W/m²

  • Sunlight (Tempest)
01,0002,0008 AM10 AM12 PM2 PM4 PM6 PM8 PM

What happened when

  • 11:30 AM–12:00 PM output under 60% of normal in strong sun for 30 min (too short to count as an incident on its own)
  • 12:15 PM–1:30 PM output under 60% of normal in strong sun for 1 h 15 min
  • 1:45 PM–2:15 PM output under 60% of normal in strong sun for 30 min (too short to count as an incident on its own)
  • 2:45 PM–3:45 PM output under 60% of normal in strong sun for 1 h
  • 4:00 PM–5:15 PM output under 60% of normal in strong sun for 1 h 15 min
info
A comparable normal day July 19, 2026 had similar sunlight (5.5 vs 5.5 kWh/m²) and made 113 kWh, 106% of normal, against 61.6 kWh on this day, peaking at 19.5 kW.
Power
Powerwall gateway, 15-minute averages from its energy counters
Sunlight and temperature
Tempest weather station on site, about every 10 minutes
Array
23.3 kW DC on this date (two original inverters, 17.8 kW; expansion inverter, 5.5 kW)
Normal
0.843 kW of output per kW of panels per kW/m² of sunlight: the median of the 30 days before
chevron_rightHow this day is judged

Each 15-minute interval's output is divided by its sunlight and the array's kilowatts, and the day is compared with the median of the 30 days before it. Expected output is the sunlight times the array's kilowatts times that median, so a cloudy day expects little and a clear day a lot.

The sensor lies flat and the panels are tilted, so morning and evening intervals read a little differently from midday on every day alike. That is why the comparison is with this array's own recent days rather than a theoretical figure.