WhatsOnTool directory

Solar Panel Quantity Calculator

Round a target array up to whole panels and inspect the resulting DC capacity.

Open this tool

A target array size rarely divides into an exact number of available panels. Whole module rounding changes the installed DC capacity.

Enter the intended target and module rating. Review the resulting capacity and module area before arranging a roof layout.

Inputs and controls

Target DC array

Target and module · kW

Allowed range: 0.001 to 1000000

Module nameplate

Target and module · W

Allowed range: 1 to 10000

Module length

Module footprint · m

Allowed range: 0.01 to 20

Module width

Module footprint · m

Allowed range: 0.01 to 20

How to use

Why use this tool

The comparison keeps target watts distinct from the actual watts produced by a whole panel count.

Before relying on the result

Module area excludes aisles, setbacks, tilt spacing and structures. A whole panel count does not establish an electrically compatible string.

Tool limitations

Module area excludes aisles, setbacks, tilt spacing and structures. A whole panel count does not establish an electrically compatible string.

Questions

Does the count establish a valid electrical string?

No. Voltage, current and inverter limits need separate checks before connecting the modules.

What should I check before using Solar Panel Quantity Calculator?

Check Target DC array, Module nameplate, Module length and Module width. Use the exact units shown beside the controls and replace any example values with your own inputs.

Source page last modified: 2026-10-01T18:56:35+00:00. This profile describes the tool; use its page to run it.

Markdown profile