Solar Panel Output Calculator

Solar Panel Output is evaluated from Panel Wattage, Number of Panels and Peak Sun Hours per Day. The calculation reports System Size, Daily Output and Annual Output.

Results

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About the Solar Panel Output Calculator

Solar Panel Output is treated here as a quantitative relation between Panel Wattage, Number of Panels, Peak Sun Hours per Day and System Efficiency and System Size, Daily Output, Annual Output and% of Average US Home Covered.

The calculator uses a multi formula configuration. Each reported value is read as a direct evaluation of the stored rules with the declared field formats and units.

Formula basis:
System kW = Panel Watts x Number of Panels / 1,000
Daily Output = System kW x Peak Sun Hours x Efficiency
Annual = Daily x 365

Interpret the outputs in the order shown by the result fields. Optional inputs affect only the outputs that depend on those variables.

Formula & How It Works

The calculation applies the following relations exactly as recorded in the metadata:

System kW = Panel Watts x Number of Panels / 1,000
Daily Output = System kW x Peak Sun Hours x Efficiency
Annual = Daily x 365

Each output field is produced by substituting the supplied inputs into the relevant relation and then applying the declared rounding or text format.

Worked Examples

Example 1: 7 kW system (20 × 350W panels), Phoenix AZ (6.5 peak sun hours)

Inputs

panel_watts: 350 num_panels: 20 peak_sun_hours: 6.5 system_efficiency: 80
System Size: 7 kW. Daily Output: 36.4 kWh/day. Annual Output: 13,286 kWh/yr. % of Average US Home Covered: 125%

With Panel Wattage = 350, Number of Panels = 20, Peak Sun Hours per Day = 6.5 and System Efficiency = 80 as the stated inputs, the result is System Size = 7 kW, Daily Output = 36.4 kWh/day and Annual Output = 13,286 kWh/yr. Each value corresponds to the declared output fields.

Example 2: 5 kW system (15 × 400W panels), New York (4.2 peak sun hours)

Inputs

panel_watts: 400 num_panels: 15 peak_sun_hours: 4.2 system_efficiency: 78
System Size: 6 kW. Daily Output: 19.7 kWh/day. Annual Output: 7,174 kWh/yr. % of Average US Home Covered: 67%

With Panel Wattage = 400, Number of Panels = 15, Peak Sun Hours per Day = 4.2 and System Efficiency = 78 as the stated inputs, the result is System Size = 6 kW, Daily Output = 19.7 kWh/day and Annual Output = 7,174 kWh/yr. Each value corresponds to the declared output fields.

Example 3: 10 kW system (25 × 400W panels), Austin TX (5.2 peak sun hours)

Inputs

panel_watts: 400 num_panels: 25 peak_sun_hours: 5.2 system_efficiency: 80
System Size: 10 kW. Daily Output: 41.6 kWh/day. Annual Output: 15,184 kWh/yr. % of Average US Home Covered: 143%

With Panel Wattage = 400, Number of Panels = 25, Peak Sun Hours per Day = 5.2 and System Efficiency = 80 as the stated inputs, the result is System Size = 10 kW, Daily Output = 41.6 kWh/day and Annual Output = 15,184 kWh/yr. Each value corresponds to the declared output fields.

Example 4: Small starter system: 3 kW (8 × 375W), Seattle WA (3.5 peak sun hours)

Inputs

panel_watts: 375 num_panels: 8 peak_sun_hours: 3.5 system_efficiency: 78
System Size: 3 kW. Daily Output: 8.2 kWh/day. Annual Output: 2,989 kWh/yr. % of Average US Home Covered: 28%

With Panel Wattage = 375, Number of Panels = 8, Peak Sun Hours per Day = 3.5 and System Efficiency = 78 as the stated inputs, the result is System Size = 3 kW, Daily Output = 8.2 kWh/day and Annual Output = 2,989 kWh/yr. Each value corresponds to the declared output fields.

Common Use Cases

  • Calculate daily solar energy output from panels
  • Estimate annual solar electricity production
  • Determine how many panels to meet electricity needs