How Long Will a 12V Fridge Run on a Leisure Battery?

Updated: 23 September 2026 · EuroVan Shop

How long will a 12V fridge run on a leisure battery?

A 12 V compressor fridge typically runs for about 1.5 to 4 days on a 100 Ah lithium battery with no charging at all. That range is an estimate, not a promise: it assumes a fridge listed at 22 to 30 W, about 90 Ah of usable capacity, and no other appliances on the battery.

The answer moves a lot with three things: how many hours a day the compressor actually runs, how big your battery really is, and whether anything puts energy back in (solar, alternator charging or a campsite hook-up). With a charging source, a well-sized system keeps the fridge running indefinitely.

12V fridge power consumption: watts, amps and amp-hours

Fridge power consumption is easiest to read in three steps: watts (W) tell you the draw, amps (A) tell you the current on your 12 V circuit, and amp-hours (Ah) tell you how much of your battery a day costs.

• Amps = watts ÷ volts. A fridge drawing 25 W on 12 V pulls about 25 ÷ 12 ≈ 2.1 A while the compressor runs.
• Ah per day = amps × hours running. At 2.1 A, 12 hours of compressor running is about 25 Ah; 24 hours is about 50 Ah.
• Label maximum vs real use. The higher figure on the label (for example 40 W on the VanCool 50 L SVR, 70 W on the 90 L DCR) is the compressor's maximum, reached while it pulls a warm cabinet down to temperature. Once cold, the draw drops to the figures in the table below.

On a 24 V system the same fridge draws half the current, so the Ah figures halve too; the energy used (Wh) is the same.

How much power does each VanCool fridge use?

The table uses the consumption listed for each VanCool model and two example scenarios. Assumptions: 12 V circuit; “100%” means the compressor runs at the listed figure all day, a prudent upper estimate close to the daily figures on our product pages; “50%” is an example where the compressor runs half the time. Real results depend on temperature, ventilation and use.

The two SVR models are the low-consumption choice of the range: 20 to 25 W in real use.

Compare all VanCool fridges

What decides how long the compressor runs?

The compressor's running time, often called the duty cycle, decides your real consumption far more than the size of the fridge. A compressor fridge switches on when the cabinet warms up and off when it reaches the set temperature, so anything that brings heat in makes it run longer.

• Ambient temperature: a van parked in summer sun is much warmer than the air outside. The hotter the van, the longer each cycle.
• Ventilation: the compressor must get rid of heat. Our DCR pages ask for at least 10 cm of free space behind the fridge with ventilation grilles; the 140 L and 170 L need 59 mm behind, or an exterior vent grille opposite the cooling unit. A boxed-in compressor works harder and cools less well.
• Door openings and warm food: every opening lets cold air out, and a bag of warm shopping takes a long pull-down.
• Thermostat and freezer: a −18 °C freezer costs more than a compartment left warmer. Set what you need, not the coldest setting.

Will a 12V fridge drain my leisure battery?

A 12 V fridge will drain your leisure battery only if it uses more energy each day than your charging puts back. On its own, a fridge is usually the largest continuous load in a van, so it is the appliance that sets your autonomy.

These are estimates with no charging and nothing else on the battery. Lead-acid and AGM batteries are generally not discharged much below half; lithium batteries allow deeper use. For the 140 L and 170 L we recommend 100 Ah as a minimum, and 200 Ah if the van also runs other equipment. The DCR fridges add a low-voltage protection that stops the compressor before the leisure battery is drained.

Can a solar panel keep a 12V fridge running?

Yes, in good weather a roof panel can cover a compressor fridge's daily use, but output varies so much with season and location that you should treat every figure as a rough estimate.

A simple way to estimate: panel watts × hours of equivalent full sun ÷ 12 V. For example, a 200 W panel with 4 hours of good summer sun gives about 800 Wh, or roughly 65 Ah before losses: more than a VanCool fridge uses in our table. On a grey winter day the same panel might give only a fraction of that. For the 85 L SVR, a 100 Ah lithium battery and a 150 W panel cover it comfortably in summer.

Charging from the alternator while you drive also refills the battery; on short trips in winter it is often the most reliable source.

Running a 12V fridge on 230 V hook-up

Every VanCool fridge is native 12/24 V, so it runs straight from the leisure battery without an inverter, and it does not run on 230 V directly. On a campsite hook-up or at home, you plug it in through our 230 V to 12 V converter (10 A / 180 W). The fridge then leaves the battery alone.

The converter comes with a 12 V 1/2/OFF selector switch: when the fridge is wired to both the battery and the converter, it draws from only one source at a time.

How to make your battery last longer

The cheapest way to gain autonomy is to help the compressor run less.

• Pre-cool the fridge on hook-up or while driving before a stay off-grid.
• Load food that is already cold, and keep the fridge reasonably full.
• Open the door briefly and plan what you take out.
• Keep the ventilation grilles clear and the space behind the fridge free.
• On the DCR models, use turbo only after shopping and night mode to switch the display off.
• Park in the shade when you can.

Still choosing a size? Read how to choose a 12V fridge.

Frequently asked questions

How long will a 12V fridge last on a 100Ah battery?

As an estimate, a VanCool fridge listed at 22 to 30 W runs about 1.5 to 4 days on a 100 Ah lithium battery with no charging, and about 1 to 2 days on a 100 Ah AGM battery. It depends on how often the compressor runs.

How many amps does a 12V compressor fridge draw?

Divide the watts by 12. A 25 W fridge draws about 2.1 A while the compressor runs, and a 30 W fridge about 2.5 A. The label maximum is only reached while pulling a warm cabinet down to temperature.

Will a 200W solar panel run a 12V fridge?

On a sunny summer day, often yes: 200 W with about 4 hours of good sun gives roughly 65 Ah before losses, more than our fridges use. In winter or bad weather it can be far less, so plan a battery reserve or alternator charging.

Can I run a VanCool fridge on 230 V?

Not directly. They are native 12/24 V fridges. On a campsite socket, use our 230 V to 12 V converter (10 A / 180 W), which includes a selector switch so the fridge draws from one source at a time.

Does a 24 V system use less power?

It draws half the current, so the amp-hour figures halve, but the energy used in watt-hours stays the same. All VanCool fridges run on 12 V and 24 V.

Related guides

• How to choose a 12V fridge for your campervan
• Compressor vs absorption fridges for campervans
• Cool box or built-in fridge for a campervan?