🔋 12 Volt Fridge Battery Runtime Calculator
Calculate exactly how long your 12V fridge will run on your battery bank — for RV, camping, van life & off-grid use
Usable DOD
Usable DOD
Usable DOD
Usable DOD
| Battery (Ah) | 40W Fridge | 50W Fridge | 60W Fridge | 80W Fridge | Battery Type |
|---|---|---|---|---|---|
| 100Ah AGM | 7.4 hrs | 5.9 hrs | 4.9 hrs | 3.7 hrs | AGM (50% usable) |
| 200Ah AGM | 14.7 hrs | 11.8 hrs | 9.8 hrs | 7.4 hrs | AGM (50% usable) |
| 100Ah LiFePO4 | 11.8 hrs | 9.4 hrs | 7.9 hrs | 5.9 hrs | LiFePO4 (80%) |
| 200Ah LiFePO4 | 23.5 hrs | 18.8 hrs | 15.7 hrs | 11.8 hrs | LiFePO4 (80%) |
| 300Ah LiFePO4 | 35.3 hrs | 28.2 hrs | 23.5 hrs | 17.6 hrs | LiFePO4 (80%) |
| 400Ah LiFePO4 | 47.1 hrs | 37.6 hrs | 31.4 hrs | 23.5 hrs | LiFePO4 (80%) |
* Assumes 35% duty cycle, 90% system efficiency, no solar charging
| Fridge Size | Typical Wattage | Avg Amps (12V) | Duty Cycle Avg | Effective Amps/hr |
|---|---|---|---|---|
| 12L Portable | 25–35W | 2.1–2.9A | 30–40% | 0.7–1.2 A/hr |
| 25L Portable | 35–45W | 2.9–3.8A | 30–40% | 1.0–1.5 A/hr |
| 40L Portable | 45–55W | 3.8–4.6A | 35–45% | 1.3–2.1 A/hr |
| 55L Portable | 55–65W | 4.6–5.4A | 35–50% | 1.6–2.7 A/hr |
| 65L RV Fridge | 65–80W | 5.4–6.7A | 40–55% | 2.2–3.7 A/hr |
| 90L RV Fridge | 80–100W | 6.7–8.3A | 40–60% | 2.7–5.0 A/hr |
| Solar Panel Size | 3 Peak Sun Hrs | 5 Peak Sun Hrs | 7 Peak Sun Hrs | Typical Use |
|---|---|---|---|---|
| 100W Panel | ~22 Ah/day | ~37 Ah/day | ~52 Ah/day | Small camp setup |
| 200W Panel | ~45 Ah/day | ~74 Ah/day | ~104 Ah/day | RV fridge + extras |
| 300W Panel | ~67 Ah/day | ~111 Ah/day | ~156 Ah/day | Full RV off-grid |
| 400W Panel | ~89 Ah/day | ~148 Ah/day | ~208 Ah/day | Van life / cabin |
* Assumes 75% panel efficiency / real-world derating factor
Many people that spend time in travel homes, trucks or camping, praise 12 volt fridge units. They do not need a usual wall plug because these devices connect directly to the power system of your car. Because wall power runs on a different circuit, use the 12 volt tie to help keep everything stable and the whole electrical setup works well during your journey.
Two main types stand before you: portable models or ones that are built in specially. Those portable 12 volt fridge units usually have compressor coolers and allow you to control the temperature level easily, what makes them reliable for road trips and outdoor experiences. Some of them have two separate zones, one part then works as a fridge, while the second stays frozen what shows benefit, if you only go out for some hours or camp for a long time and really want to keep food fresh and drinks cold at hand.
12-Volt Fridges for RVs, Trucks and Camping
In terms of size, the options are quite wide. At the most little end, you find models with one zone at around 21 quarts. Go higher, and we have units at about 47.5 quarts, then bigger two-zone versions that reach 58 quarts or even more.
When you set up a travel home, the built-in options become much bigger. Up to around 16 cubic feet in those two-sided home kinds. Some models even come with French doors and pull-out freezer drawers.
Truckfridge offers vertical types in various sizes, and most of them already have a freezer built in.
Here is one good reason to switch to that: you can fully drop propane. Traditional fridges for travel homes usually depend on propane, and honestly, some owners worry about the risk of fire, especially with less new units. A 12 volt fridge with a compressor simply removes all that issue.
The energy use deserves attention. Actually, a 12 volt fridge made for such goals is much more efficient than running a usual home type from a battery. A regular home fridge pulls a lot of power, what quickly drains your battery.
The best 12 volt compressor fridges take less then one amp each hour in a normal situation, some reach almost zero. Cheaper electric versions? They will use three to seven times more energy.
One portable unit that I tested cools from minus four degrees to 68 degrees Fahrenheit and only needs under 40 watts.
For the power system, one solar panel of 100 watts tied to a 100 amp-hour battery usually is enough to run a reliable 12 volt fridge without big effort. Even during cloudy days, that setup makes enough energy. Even so, if you lack steady sunshine, depending on a 12 volt fridge with weak solar gear would not be smart.
Known brands in that area include Dometic, ICECO, BougeRV, SetPower, Furrion and Everchill. The CFX line of Dometic gets much interest for portable freezers and fridges. The ICECO 30-quart model gives you two zones or one zone with a removable divider, plus it has an app.
Worth noting: the fridge does not run all the time. It cycles between shutoff and running, using energy around 40 to 70 percent of the day anda bit less overnight, when the temperature naturally drops down.
