How Long Will 200ah Battery Run A Fridge? + Calculator

12v 200Ah lead-acid battery with 50% depth of discharge will run a small-size camping fridge (2-5 cu. ft.) for about 36-48 hours and a large-sized kitchen fridge (20-25 cu. ft.) for about 12-16 hours.

in this short guide, I’ll explain it with the help of charts and the factors which will affect the 200Ah battery runtime on the refrigerator.

Hate calculations? use the calculator given below to find out the 200Ah battery runtime on a fridge

Battery Runtime Calculator

Battery Capacity
Battery Volts
Select Battery Type
Load Connected with inverter?
Total Load (watts)

Calculator Assumptions

  • Lead-acid battery: 50% DoD (depth of discharge) limit
  • Lithium (LiFePO4): 100% DoD (depth of discharge) limit
  • Inverter efficiency: 90% efficient

Battery Depth of discharge DoD: is the percentage of the battery that has been discharged relative to the total battery capacity. The recommended depth of discharge limit for lead-acid, AGM, and gel batteries is about 50%. Only lithium (LiFePO4) batteries can be fully discharged to 100%.

How To Use The Calculator

  • Battery Capacity: Enter battery capacity in Amp-hours (Ah) in this case it’ll be 200
  • Battery Volts: Enter battery voltage, is it 12, 24, or 48v?
  • Load Connected with inverter? is your fridge running through the inverter or is it running directly from the battery (which is possible if you have a 12v fridge and a 12v battery but in this case also you would have to install a DC-DC voltage regulator to protect the refrigerator from voltage fluctuations)
  • Total Load: Will be the average total power consumption of the fridge (Per hour) including duty cycles, keep reading to figure out the power consumption of your fridge

After putting the values click  CALCULATE “ to find out the estimated runtime of your 200Ah battery on the refrigerator.

Example: how long can a 200ah lithium battery run a fridge

Suppose you have a 12v mini camping fridge (4.5 cu. ft.), which consumes about 700Wh of power in 24 hours, and a 12v 200Ah lithium (LiFePO4) battery. Which can be discharged 100%

How Long Will 200ah Battery Run A Fridge?

12v 200Ah Lithium (LiFePO4) battery will run a 12v mini camping fridge for about 72 hours.

Note: in order to recharge your batteries you’d need the right size solar panel. use my free online solar panel calculator for battery

Related Post: Solar Panel Calculator For Battery

How Much Power Does a Refrigerator Use?

On average latest technology, refrigerators consume about 60-350 watts of power when running and 0.5-2.5kWh per day. but on the other hand, an old technology fridge (manufactured before 2010) consumes about 400- 700 watts of power and 3.2-5.6kW per day.

To calculate the accurate power consumption of your fridge read the product description sheet on your fridge to find out.

What size inverter do i need to run a fridge?

if you have a new model fridge there will be an estimated “yearly power consumption” by the company but if it doesn’t then calculate the wattage consumption of your fridge with this formula (watts = amps*volts)

let’s take my medium size RV fridge as an example (mentioned above)

115 * 1.1 = 126.5

This fridge will consume 126 watts of power when the compressor is running.

Duty Cycle: new technology fridge runs about 8-10 hours per day in total (depending on external or internal factors).

On the other hand, if you have an old technology fridge I’ll have a duty cycle of about 12-15 hours.

126 * 8 = 1000Wh or 1kWh

Medium size RV fridge consumes about 1kWh of power per day with 8 hours of duty cycle.

Note! To get started, the fridge requires a surge wattage (burst of power which will last for a few seconds) which is usually about 2-3 times higher than the continuous wattage consumption of the fridge.

Why am i telling you this? because you’d need the right size inverter to handle this surge wattage. which i have explained in detailed

Must Read: What Size Inverter To Run A Fridge?

Need an easy and accurate solution? use this watt meter to find out the total power consumption of any appliance, place this meter between the outlet and the fridge cable plug and leave it for 24 hours. after 24 hours it’ll show you the total power consumption during this period of time.

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Watch this short and quick video to save electricity usage of your fridge/refrigerator.

How Long Will a 200Ah Battery Run A Fridge? – Chart

Here are some charts on how long will a 200Ah battery will last on a different size fridge.

Fridge TypeEst. Runtime on 200ah lead-acid batteryEst. Runtime on 200ah lithium battery
12v mini fridge (2 cu. ft.)4896
camping fridge (4.5 cu. ft.)3468
kitchen fridge (10 cu. ft.)2448
kitchen fridge (15 cu. ft.)2040
kitchen fridge (20 cu. ft.)1632
kitchen fridge (25 cu. ft.)1224
kitchen fridge (30 cu. ft.)816
Table: how long will a 12v 200ah lead-acid or lithium (LiFePO4) battery will run a fridge


  • 12v 200ah lead-acid battery with a 50% depth of discharge limit will a kitchen size fridge (20 cu. ft.) for about 16 hours.

How To Calculate How Long Will a 200ah Battery Run a Refrigerator

Follow these steps to calculate the 200ah battery life/runtime while running a fridge.


1- Converter battery ah into watt-hours (Wh). to calculate the battery capacity in watt-hours use this formula

Battery capacity in watt-hours = Battery amp-hours (Ah) * Battery Volts 

let’s say you have a 12v 200ah battery

200ah battery in watts = 200 * 12 = 2400 watt-hours 

2- Multiply the battery watt-hours by the battery depth of discharge limit( Default battery depth of discharge limit, Lead-acid battery: 50% DoD limit; Lithium: 100% DoD limit ). Let’s say you have a lead-acid type battery

Battery capacity in wh after DoD limit = 2400 * 50% = 1200wh

3- Multiply the battery capacity after the DoD limit with the inverter efficiency rate to calculate the AC watt-hours ( Most of the inverters are about 90% efficient)

Battery AC watts = 1200 * 90% = 1080 AC watt-hours 

4- Divide the battery AC watt-hours by the total load connected. I’ll take a medium size RV fridge as an example which consumes about 40 watts per hour

200ah battery runtime on a fridge = 1080 / 40 = 27 hours

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Chris Tsitouris is a renewable energy professional with 10+ years of experience as Director of Engineering at Solar Spectrum, previously working as Project Manager at SunPower and Energy Analyst at the National Renewable Energy Laboratory. As a thought leader, Chris has authored numerous articles and research papers.

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