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A 12 volt fridge uses between 30 and 55 Ah (amp hours) per day on average. This table shows a guideline of average, per day 12 Volt Refrigerator freezer power use. Several brands and models were tested under a variety of conditions including fridge lid open/closing, always closed, adding room temperature liquids, deep freezing and ambient temperature variation.
Let’s use a little bit of safe space to account for opening and closing the fridge, assuming 250 watt-hours per day. We need to know the number of amp-hours we need for our battery. You need to divide the number of watt-hours by the voltage. 250 watt-hours / 12 volts = 20.8 Amp-hours. If you are using a lead-acid battery, you can only use 50% of its capacity. 20.8 amp-hours x (100%/50%) = 41.6 Ah
Now let’s estimate how long this 12V fridge would be able to run on the battery without damaging it. Refrigerator Run Time (hours) = Usable Battery Capacity ÷ Refrigerator energy consumption per hour. Refrigerator Run Time (hours) = 80 Ah ÷ 1.25 Ah/hour. Refrigerator Run Time (hours) = …
On average – 5 amps. To calculate this use the formula – Watts / Volts = Amps per hour. For example, a 60-watt fridge running on a 12-volt power source uses 60 /12 = 5 amps, but only while the motor runs. So, while planning your new kitchen or some upgrade pay attention to circuitry and your fridge amperage. Be safe!
A RV refrigerator or a residential refrigerator for Rv consuming around 150 watts while it is running would be drawing around 12 amps hour from a single 12 V battery. And under these conditions a RV refrigerator alone can run for around 4-5 hours using the 12 V …
As an example, if at 12V your refrigerator compressor uses 4 Amp power, you have to multiply 4 Amp with 12V. This will give you 48 watts. If you live in a warm-weather country, you can be assured that the fridge will work effectively for about 8 hours.
Repeat that in mid-afternoon. He says it rarely comes on in the middle of the night. Yours is: 12v x 3 amp = 36 watts x 4 hours = 144 watt hours daily for your fridge (if his method is correct.) Also use an insulated fridge bag and/or additional insulation like Reflectix.
I am looking at a solar setup that includes a compressor fridge (Secop / Danfoss) and I want to get an idea as to how many amp hours per day the fridge will consume. The fridge is rated to draw 2.5-5A depending on ambient temperature and whether it is in fridge or freezer mode.
A typical 120V fridge will chew up nearly 200 watts of power when running, and burn through almost 2000 watt-hours in a day. For a plugged-in RV, this is no big deal. But for us 12V-only boondocking types, that means that the fridge would drain a 300-amp-hour battery pack every day .
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