# 12V Fridge Power Consumption Explained (Watts vs Ah/h) > Why a 60 W fridge doesn't use 60 W: rated input vs average draw, Ah/h vs Wh, duty cycle, what independent tests measured, and why our chart is estimated. - Source: https://portablefridgeguide.com/posts/portable-fridge-power-consumption-explained/ - Markdown version: https://portablefridgeguide.com/posts/portable-fridge-power-consumption-explained.md - Last updated: 2026-10-30 --- - [Home](https://portablefridgeguide.com/) - [Guides](https://portablefridgeguide.com/guides/) - Portable Fridge Power Consumption Explained: Watts, Ah/h and Wh per Day Explainer # Portable Fridge Power Consumption Explained: Watts, Ah/h and Wh per Day Updated October 30, 2026 By [Portable Fridge Guide Editorial Team](https://portablefridgeguide.com/about/) [How we research](https://portablefridgeguide.com/how-we-research/) Prices are approximate and change often, so check the current price before you buy. ## Key takeaways - The watts on the listing are a **maximum or rated input**. A compressor fridge cycles on and off, so its **average** draw is a fraction of that. - Dometic rates the CFX3 45 at 8.2 A but publishes an average of 1.03 Ah/h at 90°F, about 12 W, or roughly 300 Wh a day. - **Ah/h × 12 = average watts. Average watts × 24 = Wh per day.** Battery Ah × 12.8 ≈ Wh for a lithium battery. - Only the EcoFlow GLACIER Classic publishes a fridge-mode average draw in our data, so most figures in our power chart are **our estimates** from capacity. ## Our top picks - 1![EcoFlow GLACIER Classic 35L](https://portablefridgeguide.com/_astro/ecoflow-glacier-classic-35.BOvSiZZQ_ZK515Y.webp)Published fridge-mode draw: 0.57 Ah/h, or 165 Wh a day, at 77°F[EcoFlow GLACIER Classic 35L](https://portablefridgeguide.com/fridges/ecoflow-glacier-classic-35/)37 qt · Single zone · Down to -4°F · 45 lb7.6**$$$**$PremiumPrice tier: Premium[Check price on Amazon](https://www.amazon.com/dp/B0F62HMKBX?tag=portablefridgeguide.com-20) - 2![Anker SOLIX EverFrost 2 40L](https://portablefridgeguide.com/_astro/anker-everfrost-2-40.CvK9adOb_27MU9N.webp)Lowest steady-state draw in OutdoorGearLab's test group: 5.8 W[Anker SOLIX EverFrost 2 40L](https://portablefridgeguide.com/fridges/anker-everfrost-2-40/)42 qt · Single zone · Down to -4°F · 50.7 lb8.2**$$$**$PremiumPrice tier: Premium[Check price](https://www.amazon.com/dp/B0DRCNMMZ9?tag=portablefridgeguide.com-20) ### On this page 8 sections - [Why doesn’t a “60 W” fridge use 60 W?](#why-doesnt-a-60-w-fridge-use-60-w) - [What do Ah/h, W and Wh mean?](#what-do-ahh-w-and-wh-mean) - [Why do some specs mention 24 V or AC?](#why-do-some-specs-mention-24-v-or-ac) - [What have independent testers measured?](#what-have-independent-testers-measured) - [Why is our power chart mostly estimates?](#why-is-our-power-chart-mostly-estimates) - [What changes how much power a fridge uses?](#what-changes-how-much-power-a-fridge-uses) - [Bottom line](#bottom-line) - [FAQ](#faq) ## Before you choose - [How Long Will a Battery Run a 12V Fridge? The Math, With Worked Examples](https://portablefridgeguide.com/posts/how-long-will-a-battery-run-a-12v-fridge/) - [What Size Solar Panel Do You Need for a 12V Fridge?](https://portablefridgeguide.com/posts/solar-panel-size-for-12v-fridge/) - [Compressor vs Thermoelectric Cooler: Why Peltier Boxes Aren't Fridges](https://portablefridgeguide.com/posts/compressor-vs-thermoelectric-cooler/) Fridge listings are full of power numbers that look precise and mean different things: “45 W”, “8.5 A”, “0.57 Ah/h”, “165 Wh/24h”. If you add a battery or solar based on the wrong one, you’ll either overspend or run out. This explainer sorts out what each number means, how to convert between them, what independent testers measured, and why most bars in our own power chart are labeled as estimates. We haven’t measured these fridges ourselves. ## Why doesn’t a “60 W” fridge use 60 W? Because a compressor fridge doesn’t run all the time. It runs until the inside reaches the set temperature, shuts off, and starts again when the temperature creeps up. Gear Diary watched this on an [ICECO VL60](https://portablefridgeguide.com/fridges/iceco-vl60-dual-zone/) running from a power station’s DC outlet: about 70 W at start-up, 56–58 W while the compressor ran, and 0 W when it cycled off. So two numbers matter: - **Rated (or maximum) input** is the most the fridge will draw, usually at start-up or in a fast-cooling mode. Dometic says to think of it as the maximum current the unit would ever draw, and to use it for sizing wiring and fuses. - **Average draw** is what the fridge uses over hours, counting the off time. This is the number for battery and solar sizing. Dometic’s [CFX3 45](https://www.dometic.com/en/product/dometic-cfx3-45-9600025318) shows the gap clearly. It’s rated at 8.2 A on DC, about 98 W at 12 V. Its published average is 1.03 Ah/h at 90°F outside and 39°F inside, about 12 W. The average is roughly an eighth of the rating. Dometic’s FAQ shows the logic with an older CFX model: about 3.75 A while running, times the share of time the compressor is on (22% in its example), gives an average under 1 Ah per hour. ## What do Ah/h, W and Wh mean? These are the units you’ll see, and how to convert: | Unit | What it means | Convert | | --- | --- | --- | | **W** (watts) | Power at a moment | W = volts × amps | | **A** (amps) | Current at a moment | At 12 V, A = W ÷ 12 | | **Ah/h** | Average amps drawn over time on a 12 V supply | × 12 = average watts | | **Wh/day** | Energy used in 24 hours | Average W × 24, or Ah/h × 12 × 24 | | **Ah** (battery) | Battery capacity at its nominal voltage | × 12.8 ≈ Wh for a lithium battery | A worked example with real published numbers. EcoFlow rates the [GLACIER Classic 35L](https://portablefridgeguide.com/fridges/ecoflow-glacier-classic-35/) at 0.57 Ah/h in fridge mode (77°F outside, 39°F inside, Eco mode): - 0.57 × 12 ≈ **6.8 W** average. - 6.8 × 24 ≈ **164 Wh** a day. EcoFlow’s own spec says 165 Wh per 24 hours, so the figures agree. - In freezer mode, EcoFlow publishes 1.8 Ah/h, or 520 Wh a day. That’s about three times as much. Batteries and power stations use different units, which is where people trip up. A 12 V battery is rated in Ah. A power station is rated in Wh. A 100 Ah LiFePO4 battery is about 1,280 Wh, while a “300 Wh” power station is roughly the same as a 23 Ah battery. Our [battery runtime guide](https://portablefridgeguide.com/posts/how-long-will-a-battery-run-a-12v-fridge/) does the full math, including how much of each battery is usable. ## Why do some specs mention 24 V or AC? Most fridges run on 12 or 24 V DC and on 100–240 V AC. The current halves at 24 V for the same power. Dometic lists the [CFX5 55IM](https://portablefridgeguide.com/fridges/dometic-cfx5-55im/) at 8.5 A on 12 V and 4.0 A on 24 V. AC ratings (55 W for that fridge) describe the wall side and don’t translate directly to battery use. Some listings mix these up. The [Euhomy 59 Quart](https://portablefridgeguide.com/fridges/euhomy-59qt/) listing gives a 45 W “average power consumption”, but OutdoorGearLab measured 9.2 W at steady state. For battery planning, look for a 12 V Ah/h figure with its test temperatures, and be skeptical of anything else. ## What have independent testers measured? OutdoorGearLab logged power for every cooler it tested. The steady-state numbers are useful for comparing fridges, but OutdoorGearLab doesn’t state the ambient temperature, so we don’t treat them as ratings. | Cooler (as OutdoorGearLab names it) | Steady-state DC draw | Energy in first 6 hours (incl. cool-down) | | --- | --- | --- | | Anker EverFrost 40 | 5.8 W | 35 Wh | | Dometic CFX5 45 | 6.8 W | 41 Wh | | BougeRV 23 Quart | 8.3 W | 50 Wh | | Euhomy 59 Quart | 9.2 W | 55 Wh | | Igloo Iceless VersaTemp 35 (thermoelectric) | 61.7 W | 370 Wh | Two lessons. First, insulation and compressor design matter: the [Anker EverFrost 2 40L](https://portablefridgeguide.com/fridges/anker-everfrost-2-40/) and the CFX5 platform sip power once cold. Second, thermoelectric coolers are in a different league. The Igloo drew about ten times as much as the compressor fridges and still never reached 40°F. See [compressor vs thermoelectric](https://portablefridgeguide.com/posts/compressor-vs-thermoelectric-cooler/). Real camping uses more than a lab steady state. Gnomad Home logged an ICECO VL35 ProS over 123 hours of real use and measured about 508 Wh a day, roughly 1.76 A average. That’s what lid opening, warm food and hot afternoons do. ## Why is our power chart mostly estimates? Estimated power use per day (Wh) Energy per 24 hours at 90°F outside and 37°F inside, scaled from each maker's published average draw. Lower is better. Single zone Dual zone [C20* 190](https://portablefridgeguide.com/fridges/alpicool-c20/)[BougeRV 23 qt* 190](https://portablefridgeguide.com/fridges/bougerv-cr22-23/)[CFX2 28* 220](https://portablefridgeguide.com/fridges/dometic-cfx2-28/)[GO20* 220](https://portablefridgeguide.com/fridges/iceco-go20/)[Glacier Classic 35L 230](https://portablefridgeguide.com/fridges/ecoflow-glacier-classic-35/)[EverFrost 2 40L* 260](https://portablefridgeguide.com/fridges/anker-everfrost-2-40/)[VL45 ProS* 280](https://portablefridgeguide.com/fridges/iceco-vl45-pros/)[CRD2 V2 43 + Battery* 310](https://portablefridgeguide.com/fridges/bougerv-crd2-v2-43-battery/)[CFX5 55IM* 310](https://portablefridgeguide.com/fridges/dometic-cfx5-55im/)[Euhomy 59 qt* 310](https://portablefridgeguide.com/fridges/euhomy-59qt/)[VL60 Dual Zone* 400](https://portablefridgeguide.com/fridges/iceco-vl60-dual-zone/)[CFX5 75DZ* 460](https://portablefridgeguide.com/fridges/dometic-cfx5-75dz/)[VL75 ProD* 460](https://portablefridgeguide.com/fridges/iceco-vl75-prod/) 0200400600 * No published fridge-mode draw: estimated from capacity, calibrated on fridges that publish one, so treat it as rough. Freezer settings, lid opening and warm food all add to these figures. Run your own numbers in the [battery runtime calculator](https://portablefridgeguide.com/tools/battery-runtime-calculator/). Because makers rarely publish a comparable average draw. In our data: - **Only the EcoFlow GLACIER Classic 35L** publishes a fridge-mode average draw with test conditions. - **Dometic publishes figures for the CFX5 sizes we feature, but not in fridge-only mode.** The CFX5 55IM’s 1.55 Ah/h includes the ice maker running. The CFX5 75DZ’s 2.76 Ah/h has one zone freezing. Using them would make those fridges look worse than fridge-only rivals, so our chart uses a fridge-only estimate instead. - **ICECO publishes MAX-mode wattages** (45 W for the VL45 ProS, 57 W for the VL75 ProD). Its manual notes the data is only suitable for laboratory testing. These are not averages. - **Most budget brands publish a single rated wattage** and nothing else. So for every fridge without a usable published average, we estimate from size. At 90°F outside and 39°F inside, we use 110 Wh + 3.4 Wh per liter per day, plus 20% for dual zones. We calibrated that on the published figures we do have: Dometic’s CFX3 45 (about 297 Wh), Dometic’s rating for the CFX5 45 (about 248 Wh), and the GLACIER Classic scaled to 90°F (about 219 Wh). Then we scale every figure to the chart’s 90°F/37°F condition by the temperature gap. Thermoelectric coolers are the exception: they run flat out, so we use their full draw all day. That’s why the Igloo isn’t on the chart at all. By our estimate it uses about 1,490 Wh a day. What this means for you: the chart is good for comparing sizes and types, and a rough guide to battery needs. It isn’t a measurement of any one fridge. If you need precision, measure your own with a shunt monitor like the [Victron SmartShunt](https://www.amazon.com/dp/B0BF636VBX?tag=portablefridgeguide.com-20), or use the Dometic app’s energy graph, which Dometic says shows consumption when running on DC. ## What changes how much power a fridge uses? - **Outside temperature.** The biggest factor. Scaled from Dometic’s figure, a 45-quart fridge uses nearly twice as much at 100°F as at 70°F. - **Set temperature.** Dometic recommends 39°F for refrigeration and notes that even small changes in setting affect consumption. - **Freezer mode.** About three times fridge mode, per EcoFlow’s figures. - **Sun, ventilation and placement.** See our [hot weather tips](https://portablefridgeguide.com/posts/portable-fridge-hot-weather-tips/). - **Lid opening and warm food.** Each adds pull-down work. - **Eco vs Max mode.** Eco usually runs the compressor slower or the fan less. Anker’s runtime claims for the EverFrost 2 are all in Eco mode. ## Bottom line Ignore the headline watts for battery planning. Look for a 12 V average in Ah/h with its test temperatures, convert it to Wh a day, and scale for your weather. Where a maker doesn’t publish one, which is most of them, our chart gives a size-based estimate you can use as a starting point. Put any of them into the [battery runtime calculator](https://portablefridgeguide.com/tools/battery-runtime-calculator/) to see what it means for your battery and solar. ## Don't guess. Calculate. - [🎯 Fridge Matcher](https://portablefridgeguide.com/tools/fridge-matcher/): which fridges fit your trip - [🔋 Battery Runtime](https://portablefridgeguide.com/tools/battery-runtime-calculator/): hours per charge and solar needed - [🧊 Fridge vs Ice](https://portablefridgeguide.com/tools/fridge-vs-ice-cost/): how fast it pays back - [📊 Compare every fridge](https://portablefridgeguide.com/fridges/): sortable spec table ## Frequently asked questions ### How many watts does a 12V portable fridge use? While the compressor runs, typically about 40–60 W; Gear Diary measured an ICECO VL60 at 56–58 W on DC. Averaged over a day it's far less, often roughly 5–20 W once the fridge is cold, depending on size, insulation and the weather. That's about 150–400 Wh a day for most single-zone fridges in warm weather. ### What does Ah/h mean on a fridge spec sheet? Amp-hours per hour: the average current the fridge draws from a 12 V battery over time, at stated outside and inside temperatures. Divide your battery's usable Ah by this number to get hours of runtime. ### Why does my fridge use more power than the spec says? Published figures are measured in steady conditions with the lid closed. Heat, sun on the case, warm food, frequent opening, a colder setting, freezer mode and blocked vents all raise real-world consumption. Gnomad Home measured an ICECO VL35 ProS averaging about 508 Wh a day over 123 hours of camping. ### Do thermoelectric coolers use less power than compressor fridges? No. A thermoelectric cooler runs constantly. OutdoorGearLab measured the Igloo Iceless VersaTemp at about 62 W steady state, versus 5.8–10.8 W for the compressor fridges it tested, and the Igloo still never got below 43.7°F. ## Sources - [Dometic CFX3 45 product page and FAQ](https://www.dometic.com/en/product/dometic-cfx3-45-9600025318) · checked 2026-10-30 — Rated DC input 8.2 A, rated AC input 52 W, energy consumption 1.03 Ah/h at 32°C ambient and 4°C inside; explains rated current vs average consumption; compressor example of current × running time - [EcoFlow GLACIER Classic product page and spec table](https://us.ecoflow.com/products/glacier-classic-portable-refrigerator) · checked 2026-10-30 — Refrigeration 165 Wh/24 h, 0.57 Ah/h; freezing 520 Wh/24 h, 1.8 Ah/h; tested at 25°C/77°F ambient in Eco mode - [OutdoorGearLab: The Best Electric Coolers](https://www.outdoorgearlab.com/topics/camping-and-hiking/best-powered-cooler) · checked 2026-10-30 — Measured steady-state DC draw, power draw while cooling to 35°F and energy used over the first 6 hours for each cooler - [Gear Diary: ICECO VL60 review](https://geardiary.com/2023/07/15/iceco-vl60-review) · checked 2026-10-30 — About 70 W at start-up, 56–58 W on DC while the compressor ran, 0 W when it cycled off - [ICECO VL35/45/60 ProS user manual](https://nomadicsupply.com/wp-content/uploads/2026/05/iceco-vl354560-pros-manual-book.pdf) · checked 2026-10-30 — MAX-mode electrical power by model (VL45 ProS 45 W, VL75 ProD 57 W, GO20 50 W); data only suitable for laboratory testing ## Get new guides by e-mail One short e-mail when Portable Fridge Guide publishes a new guide. No spam, no sharing your address, and you can unsubscribe in one click. E-mail address New posts only · Unsubscribe anytime · [Privacy](https://portablefridgeguide.com/privacy/) Our #1 pick Published fridge-mode draw: 0.57 Ah/h, or 165 Wh a day, at 77°F ![EcoFlow GLACIER Classic 35L](https://portablefridgeguide.com/_astro/ecoflow-glacier-classic-35.BOvSiZZQ_1BQs2x.webp) ### [EcoFlow GLACIER Classic 35L](https://portablefridgeguide.com/fridges/ecoflow-glacier-classic-35/) 7.6 - 37 qt - Single zone - Down to -4°F - Battery included EcoFlow power-station owners who want a cordless fridge with a published, low average draw and IPX4 weather resistance. [Check price on Amazon](https://www.amazon.com/dp/B0F62HMKBX?tag=portablefridgeguide.com-20)[Read the full review](https://portablefridgeguide.com/fridges/ecoflow-glacier-classic-35/) [🔋 Will your battery last? Runtime and solar needs for your fridge, battery and weather.](https://portablefridgeguide.com/tools/battery-runtime-calculator/)[📊 Compare every fridge Sortable chart of every fridge we track.](https://portablefridgeguide.com/fridges/) ## Keep reading [Power ### How Long Will a Battery Run a 12V Fridge? The Math, With Worked Examples How long a battery runs a 12V fridge: usable Ah divided by average draw, adjusted for heat. Worked examples for AGM, LiFePO4, power stations and built-in packs. Updated Oct 30, 2026](https://portablefridgeguide.com/posts/how-long-will-a-battery-run-a-12v-fridge/)[Solar ### What Size Solar Panel Do You Need for a 12V Fridge? How many watts of solar a 12V fridge needs: daily Wh divided by peak sun hours and losses, with worked examples for small, 45-quart and dual-zone fridges. Updated Oct 30, 2026](https://portablefridgeguide.com/posts/solar-panel-size-for-12v-fridge/)[Explainer ### Compressor vs Thermoelectric Cooler: Why Peltier Boxes Aren't Fridges Compressor vs thermoelectric 12V coolers: why Peltier coolers only get 36–40°F below ambient and draw power nonstop, and when each type is worth buying. Updated Oct 30, 2026](https://portablefridgeguide.com/posts/compressor-vs-thermoelectric-cooler/) Published fridge-mode draw: 0.57 Ah/h, or 165 Wh a day, at 77°F Glacier Classic 35L $$$$ Premium Price tier: Premium [Check price](https://www.amazon.com/dp/B0F62HMKBX?tag=portablefridgeguide.com-20)