Free Solar Panel Calculator
System size, output and savings for a rooftop solar array.
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Inputs
Result
System size needed
6.84 kW
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Short answer
System size, output and savings for a rooftop solar array.
What is the Solar Panel Calculator?
System size, output and savings for a rooftop solar array.
How does the Solar Panel Calculator work?
Enter the inputs above and read the result.
Formula
Variables
0.8System derate factor
Explanation
Real arrays lose roughly 20% to heat, wiring and inverter losses.
Examples
Applications
Advantages
Limitations
Common mistakes
Tips
Related concepts
The Solar Panel Calculator sits inside the Everyday & Utility Calculators hub, in the home & energy cluster. Utility usage and household running costs. Understanding the terms below makes the output easier to interpret and easier to compare against neighbouring measures.
Practical use cases and industry applications
Understanding Solar Panel
System size, output and savings for a rooftop solar array. Within everyday & utility calculators, solar panel belongs to the home & energy cluster, where it shares terminology and assumptions with closely related tools.
Learning how solar panel is calculated
Real arrays lose roughly 20% to heat, wiring and inverter losses. Working through the variables one at a time — 0.8 — makes the result reproducible by hand and easier to sanity-check.
Using solar panel to make a decision
Because outputs depend on the assumptions you enter, run more than one scenario before committing to a figure.
How solar panel compares with related measures
kilowatt-hour, tariff, standby load, efficiency rating all describe adjacent aspects of home & energy. Comparing this calculator's output against those measures — using the related tools listed on this page — prevents a single metric from being read in isolation.
Frequently asked questions
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