Installer tools

Small tools that show their working

Utilities for the jobs that sit either side of a design — quick to use on site, and transparent about how they reached an answer. Free, no account needed.

DC cable calculator
Size a PV string or array cable. Works out the two minima separately — current-carrying capacity after correction, and the CSA needed to hold your chosen volt-drop criterion — recommends the larger standard size, and shows every factor and source behind it.
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Something you calculate on every job and would rather not? Tell us — this list is meant to grow.

DC cable calculator