Free Solar Panel Sizing Calculator
Number of solar panels needed to cover energy use.
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Inputs
Result
Panels needed
19
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Short answer
Number of solar panels needed to cover energy use.
What is the Solar Panel Sizing Calculator?
Number of solar panels needed to cover energy use.
How does the Solar Panel Sizing Calculator work?
Enter the inputs above and read the result.
Formula
Variables
Sun hoursAverage peak sun hours for the location
Explanation
System losses (inverter, wiring, dirt) mean real output is lower than the panels' rated capacity.
Examples
Applications
Advantages
Limitations
Common mistakes
Tips
Related concepts
The Solar Panel Sizing 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 Sizing
Number of solar panels needed to cover energy use. Within everyday & utility calculators, solar panel sizing belongs to the home & energy cluster, where it shares terminology and assumptions with closely related tools.
Learning how solar panel sizing is calculated
System losses (inverter, wiring, dirt) mean real output is lower than the panels' rated capacity. Working through the variables one at a time — Sun hours — makes the result reproducible by hand and easier to sanity-check.
Using solar panel sizing 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 sizing 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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These tools share entities, formulas or user intent with the solar panel sizing calculator.
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