How long can a 12V 100Ah battery run a fridge?

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VIDEO CHAPTERS
00:00 Preview
00:29 Estimated Runtimes Of Refrigerators On A 12V 100Ah Battery
00:54 Running My 7 Cu. ft. fridge on a 12V 100Ah Lead-Acid Battery
01:33 Details About The Test
03:34 Results After An Hour And A Few Minutes
04:10 Results After About 7 Hours Of Runtime
05:05 Some More Details To Provide Additional Perspective
05:40 Why I'm Only Using 50% Of My Battery's Capacity
06:54 Conclusion And Additional Resources

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How long can a 12V 100Ah battery run a fridge?

I tested a 12V 100Ah battery to see how long it would power my fridge, and it lasted about 7 hours.

But the runtime of YOUR fridge on such a battery will depend on two factors:

The electricity usage of the fridge, which depends on factors like size, energy efficiency, room temperature, set temperature, fridge fill level, and door openings.
The usable capacity of the battery. While Lithium batteries can be fully discharged, Lead-Acid batteries can only supply 50% of their rated capacity before needing a recharge.

For instance, on average, you could run a 12V car refrigerator for about 100 hours on a 12V 100Ah Lithium battery, which can supply up to 1200 Wh of energy on a single charge.

On the other hand, if you run the same 12V fridge on a 12V 100Ah Lead-Acid battery, which can only supply 600 Wh of energy, you would only get about 50 hours of runtime before having to disconnect the battery.

Naturally, a bigger refrigerator will consume more energy and will drain either of these types of batteries much quicker.

Here are some facts about my specific test:

My refrigerator is mid-sized, approximately 7 Cu. ft. (200L or 210 QT) in capacity, similar to most RV refrigerators.
The refrigerator was filled to about 80% of its capacity.
I set the fridge to its maximum cooling setting for the duration of the test.
The fridge operated at a room temperature ranging from 86°F to 90°F (30°C to 32°C) on the day of the test.

Have you tried running your fridge on a battery? If so, how long did the battery run the fridge? Please tell me in the comments below.

If you have any questions, drop them in the comments, and I'll be happy to help!

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DISCLAIMER:

For general informational purposes only. Nothing in this video is intended to be professional electrical advice. Please consult with a licensed professional in their field of expertise in your jurisdiction.