How Long Can a 12V Fridge Run on a 100Ah Lithium Battery

A 12V fridge can run for approximately 33–66 hours on a 100Ah lithium battery, depending on the fridge’s energy consumption, ambient temperature, and battery efficiency. Lithium batteries provide 80–90% usable capacity (80–90Ah), and runtime is calculated by dividing usable capacity by the fridge’s average hourly amp draw (1.2–2.5A).

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How Do You Calculate the Runtime of a 12V Fridge on a 100Ah Lithium Battery?

To calculate runtime, divide the battery’s usable capacity (80–90Ah for lithium) by the fridge’s average amp draw. For example, a fridge drawing 1.5A per hour would run for 80Ah / 1.5A ≈ 53 hours. Factor in the fridge’s duty cycle (how often it runs) and ambient temperature for accurate estimates.

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