An RV fridge works better when it is moderately full rather than empty.
Whether it is better to leave your RV refrigerator on all the time depends on how often you camp. For frequent use (trips every 1-2 weeks), leaving it on saves the hassle of cooling it down and restocking. For long-term storage or winterization, it is better to turn it off and prop the doors open to prevent mold.
A full fridge is a happy fridge because the thermal mass of its contents helps maintain the temperature (or in other words, the cold stuff helps keep it cold). In a full fridge, the compressor won't need to cycle on and off as much, which will extend the life of the compressor and reduce running costs.
Below is a list of practical tips for maximizing your RV fridge's efficiency to make it last for as long as possible.
A 12-volt RV refrigerator will typically run for 16 to 40 hours on a single 100Ah lithium battery or 12 to 24 hours on a 100Ah lead-acid battery before needing a recharge, depending on outside temperatures. For most users, this translates to about one to two days of moderate use without solar supplementation.
Running lights, a furnace or AC, a fridge, or even a water pump overnight will quickly drain RV batteries.
Cons of a 12V Fridge
I also drain out all the antifreeze. After running the pink stuff through, I just open (and leave open all winter) all the faucets and also the low point drains. Most of the pink stuff will drain out on its own and even if some remains there will be plenty of air in the lines for slushing and expansion.
An electric fridge cools down in two to four hours from room temperature. Propane takes 8 to 12 hours. If you're leaving soon, electric will keep food cold fast, but you'll have to plan ahead with propane. In heat above 95°F, propane doesn't work very well, but electricity keeps the cool air going.
The Amish generally use propane (gas) refrigerators, solar-powered appliances, or traditional iceboxes stocked with harvested pond ice. Because their Ordnung (community rules) forbid direct connection to the public electrical grid, they rely on alternative energy and low-tech cooling solutions to keep food fresh.
Heating and cooling systems (HVAC)—such as central air conditioning and electric furnaces—use the most electricity in a home, accounting for about 40% to 50% of your total energy consumption.
Putting a coin on top of a frozen cup of water acts as a power outage detector. If your power goes out and the freezer thaws, the ice melts, causing the coin to sink. When the power returns and refreezes the water, the sunken coin alerts you that your food may have spoiled and should be discarded.
A full fridge maintains a colder, more consistent temperature than an empty one. The stored food and drinks act as "thermal mass," holding the cold and absorbing heat whenever the door is opened. An empty fridge loses its cold air quickly and takes longer to recover.
The 4-4-4 RV Rule is a popular trip-planning guideline used to prevent driver fatigue and keep travel enjoyable. It recommends:
To control your RV refrigerator's temperature, adjust the control board settings or slide the thermistor (the small sensor clipped to the cooling fins inside the fridge). Moving the thermistor up the fin makes the fridge colder, and moving it down makes it warmer. The target temperature is 37∘F to 40∘F.
The RV 3-3-3 rule is a popular trip-planning guideline designed to prevent travel burnout, reduce stress, and ensure you reach your destinations safely.
Generally, a 10 to 12 cubic foot RV fridge will burn about 1.5 pounds of propane per day.
8 Essential Tips to Keep Your RV Refrigerator Running Efficiently
Absorption refrigerators are the most common models found in RVs today and they are the most flexible in terms of power source. You'll find two-way models, which run on either LP gas (propane), or shore power (AC), or three-way models, which run on propane, shore power, or direct current.
RV pipes usually will not freeze solid in a single night if the temperature only dips into the high 20s (e.g., 28∘F28 raised to the composed with power F28∘F to 32∘F32 raised to the composed with power F32∘F) for a few hours and warms above freezing during the day. However, water lines exposed directly to the outside, like an uninsulated city water hose, can freeze in just a few hours.
How often do you need to empty a campervan toilet? It's best to empty the toilet cassette every two days, even if it's not completely full. Regular emptying helps prevent odours and makes handling the cassette easier. It also ensures you're never caught out with a full tank when there's no dump station nearby.
Yes, you can safely put food-grade RV antifreeze (propylene glycol) into your freshwater tank, but most experts do not recommend it. It is perfectly non-toxic, but it will leave a strong, foul taste and odor in your system that can take months of flushing to completely eliminate.
A 100Ah battery will typically run a 12V fridge for 1.5 to 3 days (36 to 72 hours) on a single charge. The exact runtime depends primarily on the type of battery, weather conditions, and how you use it.
Yes, 12-volt (12V) RV refrigerators are excellent and increasingly popular, especially for campers who frequent RV parks or have robust solar setups. They offer residential-style cooling using a compressor, meaning ice cream stays frozen and they cool down in about an hour rather than taking all day.
Had a tour of an Amish home. Using no electricity, they have propane stove and refrigerator. They had a washing machine run on a gas engine. Very interesting how they live their lives without modern conveniences.