SuperCalX

Solar Panel Calculator

Estimate solar system size, cost, and payback period.
Calculator
Enter your values
Results
System Size
9.3 kW
Panel Count
24
Net Cost (after 30% credit)
$20,160
Payback Period
11.2 Years
Analysis
Interpretation of the current calculator output

Calculation Summary

The current inputs have been processed for the solar panel calculator. Review the results panel for the computed output and use the charts tab to compare the current values visually.

How to Read It

The main result shows the direct answer for your current inputs. Supporting sections below explain the method, example, and common questions so the result is easier to interpret.

How to Use

Step-by-step instructions
  1. 1Enter your average monthly electric bill.
  2. 2Enter the average peak sun hours for your location.
  3. 3Adjust panel wattage and cost estimates.
  4. 4The calculator will estimate system size and savings.

System Sizing

Calculates the required system size based on energy usage and local sun availability, accounting for system losses (efficiency ~80%).
Size (kW) = (Daily kWh / Sun Hours) / Efficiency

Variables:

kWhEnergy Usage
HoursPeak Sun Hours

Example

Home System

Inputs:

Bill:$150
Sun Hours:4.5
Panel:400W

Steps:

  1. 1.Usage ≈ 1000 kWh/mo
  2. 2.Daily ≈ 33 kWh
  3. 3.Size = 33 / 4.5 / 0.8 ≈ 9.2 kW
  4. 4.Panels = 9200 / 400 = 23
Result:
9.2 kW System, 23 Panels

Frequently Asked Questions

What are peak sun hours?

Peak sun hours are not just daylight hours. They represent the equivalent number of hours per day when solar irradiance averages 1000 W/m². Most US locations get 3-5 peak hours.