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Health

Saturday, September 19, 2026

The array ran at 101% of normal for the sunlight.

Normal23.3 kW array · 3.7 kWh/m² of sunlight
Made82.1kWhwhile the sensor had readings
Expected for the sunlight77.7kWhat this array's 30-day normal
Shortfall0.0kWhwithin normal day-to-day spread
Peak18.6kW80% of the array's kW; air up to 90°F

Power · kW

  • Solar
  • House
  • Expected for the sunlight
01020308 AM10 AM12 PM2 PM4 PM6 PM8 PM

Sunlight · W/m²

  • Sunlight (Tempest)
01,0002,0008 AM10 AM12 PM2 PM4 PM6 PM8 PM
info
A comparable normal day September 9, 2026 had similar sunlight (3.7 vs 3.7 kWh/m²) and made 84.3 kWh, 105% of normal, against 82.1 kWh on this day, peaking at 18.2 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
0.914 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.