A 12V fridge drawing 40–60W will run roughly 17–25 hours on a 100Ah lithium iron phosphate battery, assuming 80% practical depth of discharge for around 1,024Wh of usable energy.

That range shifts depending on the fridge's actual power draw, which varies with ambient temperature and how often the compressor cycles. A well-insulated fridge in a 70°F environment pulling 40W average gets you closer to 25 hours; the same fridge working hard in 90°F heat at 60W average drops to roughly 17 hours. A 100Ah LiFePO4 battery holds 1,280Wh at 12.8V nominal — meaningfully more usable capacity than a same-rated AGM, which typically limits you to 50% DOD.

  • Usable energy in a 100Ah LiFePO4 battery: 1,280Wh at 12.8V nominal (1,024Wh at 80% DOD).
  • Typical 12V compressor fridge draw: 40–60W average, depending on ambient temperature and load.
  • Estimated runtime at 40W draw: ~25 hours; at 60W draw: ~17 hours (80% DOD applied).
  • A comparable 100Ah AGM battery delivers roughly 640Wh usable at 50% DOD — about half the runtime.
  • Akiisolo 100Ah LiFePO4 is rated 2,000 cycles at 100% DOD, or up to 8,000 cycles at 50% DOD.