Solar Panel Calculator
Solar Panel Calculator is a construction estimator that helps you calculate solar panel values from your input data. The formula used is: DailyKwh = Monthly/30; SystemKw = Daily/(SunHrs×Eff%); Panels = ⌈SystemKw×1000/PanelW⌉. Accepts imperial (feet, inches) or metric (metres, cm) units as labelled on each input.
Formula
DailyKwh = Monthly/30; SystemKw = Daily/(SunHrs×Eff%); Panels = ⌈SystemKw×1000/PanelW⌉
Example Calculation
Inputs
- Monthly Electricity Usage: 300 kWh
- Peak Sun Hours per Day: 5 hrs
- System Efficiency: 80 %
- Panel Wattage: 380 W
Suppose you enter: Monthly Electricity Usage = 300, Peak Sun Hours per Day = 5, System Efficiency = 80, Panel Wattage = 380. The calculator applies the formula (DailyKwh = Monthly/30; SystemKw = Daily/(SunHrs×Eff%); Panels = ⌈SystemKw×1000/PanelW⌉) and shows all output values below. Change any input field to immediately see how the result changes.
Frequently asked questions
What is the Solar Panel?
The Solar Panel Calculator is a construction estimator that helps you calculate solar panel values from your input data. Accepts imperial (feet, inches) or metric (metres, cm) units as labelled on each input.
When should I use this calculator?
Use this calculator whenever you need a quick, accurate result for solar panel values from your input data without working through the arithmetic manually.
What units should I enter?
Accepts imperial (feet, inches) or metric (metres, cm) units as labelled on each input.
How accurate are the results?
Provides material and dimension estimates. Actual quantities depend on site conditions, waste, and cutting losses.
How do I interpret the result?
Always add a 10–15 % buffer to material estimates to account for waste, cutting errors, and variations in workmanship.
How can I verify the calculation manually?
Use the displayed formula and work through the numbers step by step. If your manual result differs slightly, check rounding and unit conversions first.
Can I use this for planning and budgeting?
Yes. Run best-case, expected, and worst-case inputs to compare outcomes and make safer planning decisions.