What Can an EcoFlow Delta Pro Run, and for How Long?

An EcoFlow Delta Pro can run almost any 120V appliance. This guide gives real runtimes for home backup, heating, cooling, camping, EV charging and medical equipment.

The Short Answer

The EcoFlow Delta Pro can run almost any 120V appliance in a home. The only question is for how long, and that comes down to one piece of arithmetic: usable battery divided by average load. This guide gives you the numbers for home backup, heating and cooling, camping, van life, electric vehicle top-ups and medical equipment, all on a single Delta Pro with no extra batteries and no solar. Then it shows how much each of those two upgrades changes the picture.

The Formula

Runtime (hours) = (3,600Wh × 0.85) ÷ appliance average watts

The 0.85 accounts for inverter losses; EcoFlow's own efficiency figures are a little better than that, so these estimates are conservative. That leaves roughly 3,060Wh of usable AC power. The other half of the formula, "average watts," is where people go wrong. An appliance's label shows its maximum draw. What matters is what it uses over an hour. A refrigerator labeled 700W averages 50 to 70W because the compressor cycles on and off. A space heater labeled 1,500W really does pull 1,500W every second it is on high. Cycling loads run for days; continuous heating loads run for hours.

Home Backup

Load	Average draw	One Delta Pro	With 2 extra batteries (10.8kWh)
Full-size refrigerator	1.35kWh/day	About 2 days	About 7 days
Chest freezer	1kWh/day	About 3 days	About 9 days
Fridge + freezer + router + LED lights + phones	About 3kWh/day	About 1 day	About 3 days
Gas furnace blower (1/2 HP, cycling)	About 3kWh/day in winter	About 1 day	About 3 days
Sump pump (1/3 HP, 10 min/hour)	About 130W average	About 23 hours	About 3 days
Well pump (1/2 HP, 1 hour/day total)	1kWh/day	About 3 days	About 9 days
Electric dryer, one full cycle	About 3kWh	One cycle	Three cycles
Microwave	1,000W	About 3 hours of cooking time	About 9 hours
55-inch TV + streaming box	About 110W	About 28 hours	About 3.5 days

In a real outage you run several of these at once. A reasonable "essentials" load of fridge, freezer, furnace blower, router, lights and phone charging comes to about 5 to 6kWh a day, so one Delta Pro covers roughly half a day to a day, and a 10.8kWh three-battery system covers about two days. Add 400W of solar and the daytime loads are largely offset, stretching either system considerably. Our battery sizing guide shows how to measure your own loads.

Heating

Resistive electric heat is the fastest way to drain any battery, and the Delta Pro is no exception, though its 3,600W output means it can at least run the largest household heaters without tripping.

• 1,500W space heater on high: about 2 hours. On the 750W low setting, about 4 hours. With a thermostat in a small, insulated room, real-world runtime can double because the element cycles.
• Heated blanket (50 to 100W): 30 to 60 hours. This is the efficient way to stay warm on battery.
• Heated mattress pad or seat (about 60W): about 50 hours.
• Two 1,500W heaters at once (3,000W): about 1 hour. The Delta Pro can do it; it just cannot do it for long.

If heat is your priority in an outage, a battery should be the backup for a propane heater, not the primary. A Martin direct-vent propane heater runs for days on a 20 lb tank and needs no electricity. Use the Delta Pro for the furnace blower, the fridge and the lights, and let propane do the heating.

Cooling

Air conditioning is a compressor load, so it cycles and the numbers are kinder than heating, but it is still the biggest summer draw.

• 5,000 BTU window unit (about 450W running): about 6.5 hours continuous, 10 to 12 hours with thermostat cycling in a small room.
• 8,000 BTU window unit (about 700W): about 4.5 hours continuous.
• EcoFlow Wave 2 portable AC (about 500 to 700W): 4 to 6 hours on high, longer on eco mode. Wild Oak Trail sells the Delta Pro bundled with a Wave 2 for $4,399.
• Box fan (about 60W): about 50 hours. Two fans and a fridge together still run about a day.
• Dehumidifier (about 300W, cycling): 10 to 15 hours.
• Central air, 3-ton (about 3,500W running): a single Delta Pro is at its limit here. Two paired units through a Smart Home Panel deliver 7,200W and run a 3-ton unit for roughly 1.5 to 2 hours of continuous compressor time per 7.2kWh, which with cycling is a few hours of cooling. For serious summer backup, a Delta Pro Ultra or Ultra X is the right platform.

Camping, RV and Van Life

Away from home the loads are smaller and the Delta Pro's 3.6kWh goes a long way. A typical family camping or weekend van setup draws something like this per day:

• 12V compressor fridge/freezer: about 0.6kWh
• LED lights, 4 hours: about 0.1kWh
• Two laptops, phones, cameras: about 0.4kWh
• Fan overnight: about 0.5kWh
• Coffee maker and induction burner, 30 minutes total: about 0.6kWh
• Water pump, small inverter loads: about 0.2kWh

That is roughly 2.4kWh a day, so one Delta Pro covers a long weekend with no charging at all. Add a single 400W panel, which produces 1.5 to 2kWh on a decent day, and the trip length becomes indefinite. For full-time van life with a microwave, a small air conditioner and a bigger fridge, plan on 4 to 6kWh a day and either two extra batteries or 800W or more of rooftop solar. The Delta Pro's 1,600W solar input is the reason it works so well for this: it can absorb a large array and refill from empty in a single sunny afternoon.

The Delta Pro's size is the trade-off. At 99 lbs it needs a dedicated spot in a van or RV bay. For car camping and tents, a DELTA 3 Plus at 27 lbs is the better tool.

Electric Vehicle Charging

A common question is whether the Delta Pro can rescue an electric car. Technically yes: plug a Level 1 EV charger into the Delta Pro's AC outlet and it will deliver about 1,400 to 1,800W to the car. But 3,600Wh of battery adds only about 3kWh to the car after losses, which in most EVs is 8 to 12 miles of range. It takes about two hours.

That is enough to reach a charging station if you are stranded a few miles away, and it is genuinely useful as an emergency top-up on a rural property. It is not a way to charge an EV routinely. If EV backup is a priority, the Delta Pro Ultra X with its 12kW output and 10kW solar input is the EcoFlow product designed for it.

Medical Equipment

For anyone who depends on powered medical equipment, the Delta Pro's combination of capacity and sub-second switchover through a Smart Home Panel makes it a strong backup. Typical runtimes on one unit:

• CPAP without humidifier (about 35W): about 85 hours, or ten nights.
• CPAP with heated humidifier (about 80W): about 38 hours, or four to five nights.
• Oxygen concentrator, 5 liters (about 350W): about 8.5 hours.
• Home dialysis machine (varies, often 300 to 500W plus water heating): one to two sessions. Talk to the equipment provider about exact draw.
• Powered wheelchair charger (about 100W for 8 hours): three to four full charges.
• Medication refrigerator (about 40W average): about 3 days.

Two practical points. First, many CPAPs and some concentrators accept 12V DC input; running them from the Delta Pro's 12V ports skips the inverter and gains back most of the 15 percent loss. Second, for equipment that cannot tolerate a gap, the Smart Home Panel switches selected circuits from grid to Delta Pro in under 20 milliseconds, faster than most devices notice.

Two Upgrades That Change Everything

Extra batteries

Each Smart Extra Battery adds 3,600Wh, and a Delta Pro accepts two, tripling every runtime in this guide. For fridges, freezers and medical equipment this is transformative: a two-day fridge becomes a week. For space heaters it helps less, turning two hours into six. Our extra battery guide works through whether the second and third batteries make sense for you.

Solar

Solar does not add capacity; it adds income. A 400W panel in reasonable sun generates 1.5 to 2kWh a day, which covers a refrigerator's entire daily draw. Four 400W panels at the Delta Pro's 1,600W input generate 6 to 8kWh on a good day, more than a typical home's essential loads. That turns a one-day backup into an indefinite one whenever the sun is out. Even in a storm, panels produce 20 to 40 percent of rated output, which stretches runtime meaningfully. The same guide covers panel choices and wiring.

Quick Reference: One Delta Pro, No Solar

• Wi-Fi router and modem (15W): about 8 days
• Laptop (50W): about 60 hours
• Full-size fridge: about 2 days
• CPAP, no humidifier: about 10 nights
• 5,000 BTU window AC: about 6.5 hours continuous
• 1,500W space heater: about 2 hours
• Electric kettle (1,200W): about 2.5 hours, or roughly 40 boils
• Phone charging: about 300 full charges
• EV Level 1 charging: about 8 to 12 miles of range

The Delta Pro is stocked at Wild Oak Trail alone and in bundles with extra batteries, a Smart Generator and the Wave 2. See the EcoFlow collection.

Frequently Asked Questions

How long will an EcoFlow Delta Pro run a refrigerator?

About two days for a typical full-size refrigerator using 1.2 to 1.5kWh per day. With two Smart Extra Batteries for 10.8kWh total, about a week. A single 400W solar panel covers a refrigerator's daily draw in good sun and extends runtime indefinitely.

Can the EcoFlow Delta Pro run a space heater?

Yes. Its 3,600W output runs a 1,500W heater, or two at once, without tripping. Runtime is about 2 hours on high or 4 hours on the 750W setting per 3,600Wh. A heated blanket at 50 to 100W runs for 30 to 60 hours and is a far better use of battery.

Can the EcoFlow Delta Pro run an air conditioner?

A 5,000 BTU window unit runs about 6.5 hours continuous, longer with thermostat cycling. Two Delta Pro units paired through a Smart Home Panel can run a 3-ton central air conditioner for a few hours. For sustained summer whole-home cooling, the Delta Pro Ultra or Ultra X is the right platform.

How long will a Delta Pro power a CPAP?

About 85 hours, or ten nights, without a heated humidifier. About 38 hours, or four to five nights, with the humidifier on. Running the CPAP from the 12V port with the manufacturer's DC cable extends both figures.

Can the Delta Pro charge an electric car?

In an emergency, yes. Through a Level 1 charger it adds roughly 3kWh to the car, about 8 to 12 miles of range, in about two hours. It is useful for reaching a charging station but not for routine EV charging.

How long will a Delta Pro last camping?

A typical family camping load of a 12V fridge, lights, fans, laptops and phones is about 2.4kWh a day, so one Delta Pro lasts a long weekend with no charging. With a 400W solar panel the trip length is unlimited in decent weather.