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Engine-Off Air Conditioning Runtime Calculator

ENGINE-OFF PLANNING

Estimate battery runtime

Use measured or conservative average current. The result is a planning estimate; ambient temperature, insulation, cycling, cable loss and battery limits change real runtime.

Estimated usable energy—
Estimated runtime—
Battery needed for target—

Verify the selected product's average and maximum current, battery manufacturer's usable-depth guidance, alternator/charger capacity and cable voltage drop before purchase.

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Photography credits

Aircraft: Jelle Vandebeeck, CC BY 2.0. Workboat: Photo: Gordon Leggett / Wikimedia Commons, CC BY-SA 4.0. Caravan: Bahnfrend, CC BY-SA 4.0. Command post: U.S. Army, public domain. These photographs are resized for display and may be cropped to fit the page; the credited photographs retain their original licences. General application photography does not confirm a particular vehicle installation or endorsement.