Last updated September 25, 2026. Not a lab test. Hours are arithmetic: published Wh ÷ cited watts. Compressors cycle.
A 12V compressor fridge is a load. Size the battery from two published numbers: the fridge’s watts, and the battery’s watt-hours.
Hours ≈ battery Wh ÷ cited watts.
That divide is a 100% duty-cycle ceiling, not a camp test. Compressors cycle, so real hours are shorter. Run the fridge on a power station’s AC outlet and inverter loss shortens them again. DC 12 V skips the inverter.
Three current catalog units below. Watts, Ah/h, and Wh are the makers’ printed figures. ECO watts, fridge Wh, and duty cycle are marked unknown where the spec table does not print them.
AC chest-freezer sibling: If you need to size a power station for a household chest freezer, see How to size a power station for an AC chest freezer for wall-plug watts and compressor-start surge. This page stays focused on 12V portable coolers.
What everyone gets wrong about fridge runtime on a power station
Three mix-ups show up in almost every fridge-on-battery thread. Off Grid keeps them separate so the math stays honest.
- 12V cooler vs AC chest freezer. This page is portable 12V compressor coolers (ICECO / Dometic / BougeRV class). A household chest freezer that plugs into a wall outlet is a different load — surge, EnergyGuide, and continuous AC. Use the sister guide: How to size a power station for an AC chest freezer.
- Wh marketing vs Wh ÷ W. A big watt-hour number on a station box is not overnight fridge time by itself. Hours ≈ published Wh ÷ the fridge watts (or Ah/h × V) you actually have. That divide is arithmetic, not a camp test.
- Duty cycle. Compressors cycle. A 100% duty-cycle ceiling (Wh ÷ rated watts) is an upper bound. Real hours are shorter. Run the cooler on AC and inverter loss shortens them again; DC 12 V skips the inverter.
Cited watts and Wh on this page stay with the makers named in the shortlist below. We do not invent ECO watts or overnight runtimes.
ICECO 21QT GO20 Dual Zone
ICECO’s US page names it a 21 QT GO20 Dual Zone 12V portable freezer. The official GO20 blog lists 20 L. Interior as a single zone: 13.8 × 9.5 × 9.3 in.
In Max mode ICECO says consumption is around 45 W. The Canada GO20 page says the same as “fully operating for Fast cooling is 45 W.” ECO watts are not published. Fridge Wh is not published. The US page mentions a PB250 battery and does not print a Wh next to it. There is no ICECO Wh ÷ W line.
Dometic CFX3 35 (SKU 9600024617)
Dometic’s US page lists a powered 12 volt cooler, 36 L. Input: DC 12/24 V, AC 120 V. Rated input power (AC): 50 W. Rated input current (AC): 0.78 A at 120 V. Rated input current (DC): 7.5 A. Do not treat 7.5 A as average draw.
Energy consumption at 12 V DC, Ambient @ 90 °F, Internal @ 39 °F: 0.98 Ah/h.
Arithmetic (not a test): 0.98 Ah/h × 12 V = 11.76 Wh per hour under that stated condition. That converts Dometic’s Ah/h row. It is not a field test. The cooler has no published energy store, so there is no matching fridge Wh and no battery-hours line for the box alone.
BougeRV CRD2 V2.0 61QT
BougeRV’s product page lists 61 Qt = 58 L, rated power input 60 W, DC 12/24 V and AC 100–240 V. Optional detachable battery: 240 Wh.
Arithmetic (not a test): 240 Wh ÷ 60 W = 4.0 hours of continuous 60 W draw. That is a 100% duty-cycle ceiling from cited numbers. Duty cycle is not published.
Check BougeRV CRD2 V2.0 61QT at BougeRV
BougeRV CRD2 V2.0 61QT on Amazon
Use the same divide on a power station
Take the station’s published watt-hours and divide by the fridge number you actually have. The 240 Wh kit is the only matching battery Wh on these three pages. 240 ÷ 60 = 4.0 hours at rated input — same ceiling as above, not a test. Dometic’s 11.76 Wh per hour is a consumption rate under a stated condition, not a pack size. ICECO has no official matching Wh, so do not invent an ICECO runtime.
Confirm DC versus AC on the station you own. See the guides hub and portable power stations.
Cited numbers
| Product | Capacity | Cited watts or Ah/h | Arithmetic hours | Source |
|---|---|---|---|---|
| ICECO 21QT GO20 Dual Zone | 21 QT / 20 L | Max ~45 W (ECO unknown) | No matching Wh | ICECO |
| Dometic CFX3 35 | 36 L | 0.98 Ah/h @ 90 °F / 39 °F, 12 V DC; AC rated 50 W | 11.76 Wh/h (Ah/h × 12 V); no matching fridge Wh | Dometic |
| BougeRV CRD2 V2.0 61QT | 61 Qt / 58 L | 60 W rated; optional 240 Wh battery | 4.0 h at 60 W continuous | BougeRV |
Sources
Re-fetched 28 August 2026. Cited numbers match the 24 August research file. No substitutions.
- https://icecofreezer.com/products/21qt-go20-dual-zone-fridge-white
- https://icecofreezer.com/en-ca/products/iceco-go20-flexible-dual-zone-12v-car-fridge (45 W Max)
- https://icecofreezer.com/blogs/iceco-fridge-guidance/go20-small-but-mighty-refrigerator (20 L)
- https://www.dometic.com/en-us/product/dometic-cfx3-35-9600024617
- https://www.bougerv.com/products/12v-compressor-fridge-freezer
- https://www.amazon.com/BougeRV-Portable-Refrigerator-Compressor-Overlanding/dp/B0GHMBX3P1 (ASIN B0GHMBX3P1 confirm only)
Hours ≈ battery watt-hours ÷ the fridge’s cited watts. That is division, not a field test. Compressors cycle, so real hours are shorter than a 100% duty-cycle ceiling.
A discontinued creek turbine will not run a 12V fridge; for river-charger history see our WaterLily turbine alternative guide, then size the battery from the fridge watts below.
Robert DeWitt writes about off-grid power gear for Off Grid Power Boom. Based in Arizona, he uses portable power stations, solar panels, and battery systems regularly in extreme heat—focusing on practical runtime, charging speed, reliability, and real-world usability for camping, RV trips, and home backup.
Editorial focus: portable power stations & solar generators, solar panel setups, batteries/inverters, and off-grid preparedness.