Select Inverter, Mini-Split, or Charge Controller:
Select Solar Panel:
Panel missing?
Select Panel Mounting Method:
How much hotter the cells run than the ambient air: flush roof mounts trap heat (+35 ºC), tilt racks breathe (+30 ºC), ground mounts cool best (+25 ºC). Added to your Max Hot Temp for the hot-weather voltage and current checks.
Bifacial gain defaults by mounting: 5% roof mount · 10% roof tilt · 15% ground mount. Applies only to bifacial modules — enter front-side specs as if there were zero gain, or enter gained specs as a custom panel with 0%.
Mounting Method Temp Adder: —
Is Selected Panel Bifacial? NO
Enter Local Min and Max Temps:
Location
Type a street address, city, postal code or ZIP into the box and press Enter or “Look up temps”, or click “Use my location”. Both temperatures then fill from 30 years of daily weather history for that spot, and the place found is shown under the box. A Canadian postal code the map data doesn't carry resolves to its postal area (the first three characters) and the result says so; type the street address for the exact spot. Both values stay editable.
Minimum Cold
Sets the cold-morning Voc that must stay under the inverter's maximum DC voltage. Exposing the inverter to a colder temperature when any amount of daylight is present may severely damage it. The lookup fills the record low — the coldest day in the 30-year record, the conservative choice. The link under the field switches to the ASHRAE extreme annual mean minimum (the average of each year's coldest day), the statistic NEC 690.7 references. To verify against official ASHRAE design conditions for your nearest weather station, use the free lookup at ashrae-meteo.info (the UCF Solar Reference Map this industry long relied on was discontinued in December 2025).
Maximum Hot
Sets the hot-day cell temperature (with the mounting method's adder) whose Vmp must stay inside the MPPT window. The lookup fills the 98th percentile of daily highs, ≈ the ASHRAE 2% design high. Three standards are acceptable design practice:
- 2% ASHRAE high temperature (most commonly used)
- 0.4% ASHRAE high temperature (required for ETO incentives, more conservative)
- Highest temperature ever recorded (most conservative)
Your Array Report
Panel Specs
- Datasheet
- Net
- Watts (STC):
- 0
- Voc:
- 0
- Vmp:
- 0
- Imp:
- 0
- Isc:
- 0
- Voc Temp (%/ºC):
- 0
- Pmax Temp (%/ºC):
- 0
- Isc Temp (%/ºC):
- 0
Inverter Specs
- # of MPPT Channels:
- 0
- MPPT Voltage Low:
- 0
- MPPT Voltage High:
- 0
- MPPT Voltage Maximum:
- 0
- MPPT #1 Amperage:
- 0
- MPPT #2 Amperage:
- 0
- MPPT #3 Amperage:
- 0
- MPPT #4 Amperage:
- 0
- Max MPPT #1 Wattage:
- 0
- Max MPPT #2 Wattage:
- 0
- Max MPPT #3 Wattage:
- 0
- Max MPPT #4 Wattage:
- 0
- Total Maximum Wattage:
- 0
The report appears here and updates live once the inverter, panel, mounting method and temperatures are all set. You can fine-tune exact panel or string counts per MPPT using the Trial Configuration fields in the report.