Off-Grid Refrigerator: Propane vs Solar (Real Fuel, Watts, and Costs)

Short answer: For an off-grid refrigerator, propane vs solar comes down to use. A 10 cu ft propane fridge burns about 1.4 lb of LPG a day, roughly 120 gallons and $313 a year at the 2026 national average. A 10 cu ft solar DC fridge uses about 524 Wh a day and costs half as much up front.

The fridge is the one appliance in an off-grid cabin that never gets a day off. It runs 24 hours a day, every day you are there, and in hot weather it works hardest exactly when you need it most. That makes it the single biggest decision in your power plan after water. If you are still pricing the rest of the system, start with our guide to what an off-grid solar system costs.

This post compares the two common off-grid choices: an absorption fridge that burns propane, and a compressor fridge that runs on 12V or 24V DC straight from a solar battery bank. We use real model specs from Unique Appliances and SunDanzer, current propane prices from the EIA, and simple math you can redo for your own cabin.

How much propane does a propane refrigerator use?

A full-size propane fridge uses about 1.4 to 2.0 lb of propane per day, depending on size. That works out to roughly 120 to 172 gallons a year if it runs nonstop.

The Unique UGP-10C, a 9.7 cu ft model (7.6 cu ft fridge, 2.1 cu ft freezer), is rated at about 1.4 lb of LPG per 24 hours, with a burner that runs between 600 and 1,600 BTU per hour. Larger Unique models are rated higher: about 1.8 lb per day for the UGP-19C and about 2.0 lb per day for the UGP-22, per Unique’s spec sheets.

Propane weighs 4.24 lb per gallon, according to propane property data from All Gas Inc. So 1.4 lb a day is about 0.33 gallons a day, or about 120 gallons a year.

What does it cost to run a propane fridge for a year?

At the U.S. average residential propane price in early October 2026, a 10 cu ft propane fridge costs about $313 a year in fuel. Your cost depends heavily on region.

Source: prices from the EIA Heating Oil and Propane Update; consumption from Unique spec sheets; conversion at 4.24 lb/gal. Costs assume year-round operation and are our estimates. A weekend cabin that shuts the fridge off between visits will spend far less.

How much power does a solar DC refrigerator use?

A 10 cu ft DC compressor fridge uses roughly 0.5 to 1.0 kWh per day. The exact number swings with room temperature, so check the test conditions on the spec sheet.

The Unique UGP-290L1 spec sheet lists a 10.3 cu ft fridge that runs on 12V or 24V, draws 56 W while running (about 4.5 A at 12V), and uses 524 Wh per 24 hours at 25°C (77°F). Unique lists a minimum solar requirement of 240 W for it. Other Unique DC models land close by: 520 Wh a day for the 170L, 584 Wh for the 275L, and 587 Wh for the 370L.

SunDanzer tests at a hotter 32°C (about 90°F), so its numbers look bigger. Its 2026 household catalog lists the 15 cu ft DCRF450 fridge/freezer at 0.99 kWh a day, with a minimum system of 445 W of PV and a 140 Ah battery. A Canadian dealer, Strat Energy, lists the same DCRF450 at 0.55 kWh a day at 70°F and 0.89 kWh a day at 90°F. Heat matters: a fridge in a hot, closed cabin can use 60% more energy than the same fridge in a cool room.

Source: Unique UGP-290L spec sheet, Unique product spec sheets, and the SunDanzer 2026 household catalog. Chest models are far more efficient because cold air stays in when the lid opens.

How many solar panels and batteries does a DC fridge need?

A 524 Wh-a-day fridge needs roughly 130 to 220 W of solar and about 1.3 kWh of battery for two days of cloudy-weather backup. Most owners round up to the maker’s minimum.

Here is the worked math. NREL says solar resource (global horizontal irradiance) runs from about 3.0 to 6.0 kWh per square meter per day over most of the continental U.S., and that overall system losses from array to output run about 20%, per its solar and storage primer. NREL also notes that one kWh per square meter is often called a “sun-hour.”

• Solar: 524 Wh divided by (3 sun-hours times 0.8) is about 218 W. In a 5 sun-hour location it is about 131 W. Unique’s 240 W minimum covers the worst case.
• Battery: Two days of fridge use is 1,048 Wh. A lithium iron phosphate (LiFePO4) battery such as the EG4 LifePower4 is rated for over 6,000 cycles at 80% depth of discharge, so divide by 0.8. That is about 1.3 kWh of nameplate capacity.
• The SunDanzer DCRF450 at 990 Wh a day needs about 412 W of solar at 3 sun-hours and about 2.5 kWh of battery for two days. SunDanzer’s 445 W minimum matches.

A DC fridge on a 12V or 24V bank skips the inverter, so you avoid inverter losses and idle draw. If the fridge shares a battery bank with a well pump, size for both. Our post on running a well pump on a portable power station shows how fast a pump can drain a battery.

What does each fridge cost to buy?

As of October 2026, a 10 cu ft propane fridge lists around $3,149, while comparable DC fridges list from about $1,099 to $2,399. The DC fridge still needs its share of solar and battery.

Source: Unique propane collection, Unique Solar DC collection, and SunDanzer household products, checked October 2026. Prices change often; sale prices may end.

Which is cheaper over 10 years?

On these list prices, a propane fridge running year-round costs about $6,280 over 10 years at the national average propane price. A DC fridge costs its list price plus the solar and battery capacity it uses.

The propane math: $3,149 for the UGP-10C plus 10 years of fuel at $313 a year is about $6,280, before any propane price changes or tank rental. For the Unique 325L DC fridge at $1,599, the comparison depends on what your extra 240 W of panels and 1.3 kWh of battery cost you. If that added hardware costs less than about $4,700, solar comes out ahead over 10 years on fuel alone. See our off-grid solar cost breakdown to price your own panels and batteries.

What are the installation and safety rules for a propane fridge?

A propane fridge is an unvented gas appliance. Unique’s manual requires a licensed gas fitter, a regulator set at 11 inches of water column, adequate fresh air, and a level installation.

The Unique UGP-6C, 8C, 10C, and 19C manual warns that the fridge is unvented, can produce carbon monoxide, and should not go in an air-tight space. It must be level side to side and front to back, because absorption cooling depends on gravity. The CO alarm and shut-off is required in Canada. The UGP-10C product page lists clearances of 2 inches on the sides, 6 inches on top, and 1 inch at the back, and a 110V backup heater that draws 2.5 A (300 W) when grid or generator power is available.

A DC fridge has none of these gas concerns. It needs a fused DC circuit sized to its running current, and enough airflow around the compressor.

Which off-grid fridge fits which cabin?

Choose solar DC if you already have, or plan, a battery bank and visit often. Choose propane if you have no solar yet, already haul propane, or face long cloudy stretches.

Source: decision rules are our own, built on the spec and price data cited above.

A simple rule: if your yearly propane bill for the fridge would be more than about a tenth of what the extra solar and battery would cost, the solar fridge likely pays back in under 10 years. Plug in your local EIA price and your hardware quote.

How does the fridge fit with the rest of your cabin systems?

The fridge sets your baseline load. Heating, cooling, water, and sanitation all draw on the same budget of fuel, watts, or space.

If you plan to cool the cabin with a heat pump, the fridge is small next to it; see running a mini-split on off-grid solar for battery sizing. Heat with wood and you remove the biggest winter load; our wood stove sizing guide covers stove size and install costs. For sanitation without a septic system, read composting toilets for an off-grid cabin. And if your water comes from a well, the pump will likely be your largest surge load: see power station sizing for a well pump.

FAQ

How long will a 20 lb propane tank run a propane refrigerator?

About 14 days for a fridge rated at 1.4 lb per day, like the Unique UGP-10C. A 20 lb tank holds 20 lb of propane, so divide by daily use. A larger fridge rated at 2.0 lb per day empties the same tank in about 10 days. Hot weather and frequent door openings shorten this.

Can a 100 watt solar panel run a refrigerator?

Only a very efficient one. SunDanzer lists a 100 W panel and 26 Ah battery as the minimum for its DC160 chest fridge, which uses 150 Wh a day. A 10 cu ft upright DC fridge using about 524 Wh a day needs roughly 130 to 240 W of solar, depending on your sun-hours.

Is a propane refrigerator safe in a small cabin?

It can be, if installed correctly. Unique’s manual says the fridge is unvented, can produce carbon monoxide, and must not go in an air-tight space. It requires a licensed gas fitter and adequate fresh air. Install a carbon monoxide alarm and keep vents near the fridge open.

Do DC refrigerators work in cold weather?

Yes, and cold rooms reduce their energy use. Strat Energy lists the SunDanzer DCR165 at 77 Wh a day at 70°F versus 348 Wh at 110°F. In winter the bigger problem is solar output, since short days can drop below 3 sun-hours, so plan extra battery capacity for cloudy stretches.

Should I run an off-grid fridge on 12V or 24V?

Match the fridge to your battery bank voltage. The Unique UGP-290L1 runs on either 12V or 24V. A 24V system halves the current for the same power, so you can use smaller wire. If your bank is 48V, you need a DC converter or must run an AC fridge through an inverter.