EcoFlow DELTA Pro: Specs, Runtimes and Who It Suits

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What the bundle is

EcoFlow’s own store sells it as “EcoFlow DELTA Pro Solar Generator (PV400W)” (EcoFlow product page, checked October 2026), with one, two or three 400W panels as options. “Solar Generator” and “PV400W” mark a bundle: the power station sold with solar panels. Check the retailer’s page for how many panels are in the box you are buying. This page therefore treats the power station and the panels as two separate questions. Storage, output and warranty belong to the power station; the panels only matter in the solar section.

Two consequences follow. A bundle price cannot be compared with a bare power station’s price, because the panels are part of the total. The only model prices on this page are EcoFlow’s own store listings, in the 240V section and the DELTA Pro 3 comparison below; a retailer’s current page shows what is in its box and what it costs. And “Solar Generator” in the name says nothing about how much solar the station itself will accept, which is a separate figure: EcoFlow lists 1,600W for the DELTA Pro.

EcoFlow’s published specifications

The specifications in the table are from EcoFlow’s DELTA Pro spec page and extra battery page, checked October 2026. The list near the end sets out the questions to put to the seller before you pay.

What it runs, and for how long

The method is one line: runtime in hours = capacity in Wh × 0.85 ÷ load in W. The 0.85 allows for inverter losses when battery DC becomes household AC, and it is the same factor used across this site. For this unit, 3,600 × 0.85 = 3,060Wh usable. The figures assume a full battery and a steady load, and they are calculations from the rated capacity, not readings from a unit on a bench.

• The fridge appears twice because it has two numbers. About 150W is what a full-size fridge pulls while the compressor runs. The compressor cycles, and an average near 60W over a day assumes it runs about 40 percent of the time. That ratio is an assumption; room temperature, door openings and the age of the fridge move it. The refrigerator wattage guide covers the spread. A compressor also draws more for a moment when it starts, about 1,500W by the figures this site uses, and the DELTA Pro’s 7,200W surge rating is well above that.
• Well pumps run in bursts. Household pumps typically draw about 1,000W (1/2 hp) to 1,600W (1 hp) while running, with a higher start-up draw. The 3.1 hours is motor-on time, not clock time. Many larger pumps are 240V, and none of the DELTA Pro’s five AC outlets is: EcoFlow’s US manual lists all five at 120V. The 240V options are set out under outlets below.
• Heat is the wrong job. A 1,500W heater empties the battery in about two hours. Electric resistance heating is a poor use of any battery this size.
• The table is a ceiling. Lithium packs deliver less in cold weather, and an inverter’s own idle draw takes a bigger share of a light load such as a router. EcoFlow’s product-page FAQ puts the DELTA Pro’s standby draw at about 30W whenever the AC output is switched on. A 10W router alone on an AC outlet therefore pulls about 40W and lasts roughly a quarter of the table figure, and a 30W CPAP alone pulls about 60W, about 6.4 nights of 8 hours rather than 9.6. Over 24 hours the standby draw comes to about 720Wh, so the day worked through below is a best case. Real runtimes land below these figures.

Adding expansion capacity scales the table linearly. Each extra 1,000Wh adds 850Wh usable, which is another 5.7 hours of a 150W load, or about 14 hours of the fridge at its 60W average.

A day of essentials, worked through

A more useful test than single loads is a day of the things you would actually keep running in an outage.

Against 3,060Wh usable, that is 3,060 ÷ 2,450 = 1.25 days, about 30 hours with no recharging. Add the 400W of panels the bundle name points to and the picture changes, though not as much as the word “solar” suggests. We take panel output as 75 percent of rated watts, 4 to 5 sun hours in summer and 2 to 3 in winter (the conventions used on this site), and apply the same 0.85 inverter factor to that energy because it leaves the battery through the same inverter.

So 400W of panels adds roughly 1 to 1.4 days in summer and about half a day in winter. If the point of buying this is a week without grid power in a cloudy month, 400W is too little for a 2,450Wh day, and the lever is more panels, not more battery.

Recharging from solar

EcoFlow lists the DELTA Pro’s maximum solar input as 1,600W, within an 11–150V window at up to 15A. What we can show here is the arithmetic of what an array delivers: usable output = rated watts × 0.75, multiplied by peak sun hours. The table gives the time to refill 3,600Wh from empty.

The table shows what an array would produce, not what this unit will accept. The DELTA Pro’s 1,600W input limit is the ceiling, and all four arrays here fall within it, provided the string voltage stays inside 11–150V and the current under 15A. For context, the power stations we track between 3,000Wh and 4,000Wh that publish a solar input list 1,200W to 2,400W, with one outlier at 150W. A 400W array is therefore small for this class, and the DELTA Pro accepts up to four times that. The EcoFlow panels we track run from 28W to 220W each, so about 400W takes two to four of them: four 100W panels make 400W, and two 220W panels such as the EcoFlow NextGen 220W Bifacial Portable Solar Panel make 440W. Check each panel’s voltage and connector against the 11–150V window before buying panels separately. The solar panel output guide explains the sun-hour figures.

Recharging from the wall

EcoFlow lists the DELTA Pro’s AC charging input as up to 1,800W at 120V (15A) and up to 3,000W at 240V (12.5A), and quotes about 2.7 hours to full at 1,800W and 1.8 hours at 3,000W (spec page checked October 2026). The arithmetic below shows where those figures sit. The formula is simple: hours = 3,600Wh ÷ input watts, plus roughly 10 percent for charging losses as a planning allowance. A standard 15A, 120V household circuit is limited to 1,800W (P = V × I), and to 1,440W for a continuous load under the usual 80 percent rule. So from one ordinary outlet this is the fastest the arithmetic allows:

The 3,600W line in the table is more than the 3,000W EcoFlow lists for 240V, and EcoFlow’s 2.7 hours at 1,800W is longer than the arithmetic floor, so plan on EcoFlow’s figures, since the input rate decides how quickly you are back to full between short grid windows. Expansion batteries lengthen every recharge in proportion, so doubling the storage doubles the hours at the same input.

Expansion

EcoFlow lists the DELTA Pro Smart Extra Battery at 3,600Wh with LFP cells and says the DELTA Pro takes up to two of them (extra battery spec page checked October 2026). Each adds 3,060Wh usable at the 0.85 factor, the same as the main unit, so one doubles every runtime in the table above. Mixing generations is less clear-cut. EcoFlow’s DELTA Pro 3 page says a DELTA Pro Smart Extra Battery can be plugged into a DELTA Pro 3, with some imbalance in charge level because the capacities differ, while EcoFlow names only the DELTA Pro 3 as compatible with the DELTA Pro 3 Smart Extra Battery. Get a written answer if you own one generation and are buying for the other.

Outlets, and the 240V question

EcoFlow’s US DELTA Pro user manual lists five AC outlets, all pure sine wave at 120V and 60Hz, sharing the 3,600W continuous and 7,200W surge ratings. A single DELTA Pro has no 240V outlet, so on its own it cannot run a 240V well pump or any other appliance wired for 240V. The 240V figure in the spec table is for charging, not output.

EcoFlow offers two ways to get 240V:

• Two DELTA Pros and the Double Voltage Hub. EcoFlow’s DELTA Pro page says two units chained together give 7,200W at 240V, using the Double Voltage Hub or the Smart Home Panel, both sold separately. The hub’s store listing gives it two NEMA 6-20 outlets and one NEMA L14-30, and says it needs two DELTA Pro units. The pair stores 7,200Wh. Two DELTA Pros at the $1,799 sale price plus the $139 hub come to $3,737 (maker list price, October 2026).
• One DELTA Pro 3. EcoFlow’s spec table for the DELTA Pro 3 lists a NEMA L14-30R outlet at 120/240V and a NEMA 6-20R at 240V, sharing 4,000W of AC output. Its FAQ adds that switching on 240V output turns off the 120V outlets, leaving only those two live. It costs $2,799 on sale ($3,299 regular; maker list price, October 2026) and stores 4,096Wh, a little over half what the DELTA Pro pair holds.

Both setups clear the running draw of a 1/2 hp pump (about 1,000W) or a 1 hp pump (about 1,600W). The start is the harder test: about 3,000W for a 1/2 hp pump and about 6,000W for 1 hp. Both starts fit inside the pair’s 7,200W rating and the DELTA Pro 3’s 8,000W surge rating. A 1 hp start with a fridge compressor starting at the same moment comes to about 7,500W, over the pair’s rating and close to the Pro 3’s, so check the pump’s own nameplate or manual. A pump wired into the house panel also needs a transfer switch or inlet, as covered in manual transfer switches.

Switchover time for a CPAP or computer

With the DELTA Pro plugged into a wall outlet, devices on its AC outlets run on grid power passed through the unit. EcoFlow’s manual says that if the grid fails, it switches them to the battery within 30ms. EcoFlow calls this a basic UPS function that does not support 0ms switching, tells owners not to connect devices that need 0ms, naming data servers and workstations, and says to test compatibility first. EcoFlow lists a 10ms switchover for the DELTA Pro 3.

Whether a CPAP or a desktop PC rides through 30ms depends on the device, so check it before an outage: run the device from the DELTA Pro while the unit is plugged into the wall, pull the DELTA Pro’s AC input cable, and watch for a restart. If the CPAP restarts, run it from the battery for the night with the wall cable already unplugged, so there is no switchover at all. For a CPAP or any other medical device, the FDA advises asking the maker or distributor whether it can be used with batteries or a generator, and checking its settings once power returns.

How it compares with the nearest units by capacity

These are four of the closest current rivals by watt-hours, picked from models whose makers publish enough data to compare. We checked the surge, solar-input and AC-input figures for the Jackery, Mango Power and ALLPOWERS on their makers’ spec pages (Jackery, Mango Power, ALLPOWERS) in October 2026; “not stated” means the maker’s spec page gives no figure. The Jackery is within 0.5 percent of the DELTA Pro’s capacity.

• Capacity is a wash; the differences are elsewhere. All five sit within 400Wh of each other. What separates them is output, published durability and how much of the spec sheet you can actually see.
• Output. The DELTA Pro’s 3,600W matches the ALLPOWERS R4000 and beats the Jackery (2,400W) and Mango Power (3,000W). The Anker is the outlier at 6,000W, 1.7 times the DELTA Pro, with a 9,000W surge rating.
• Durability on paper. The Jackery and the Mango Power publish 6,000 cycles; EcoFlow rates the DELTA Pro at 3,500 cycles to 80% capacity. Mango Power’s 10-year warranty is double the DELTA Pro’s 5 years. Jackery’s standard 3 years becomes 5 only when bought from jackery.com, which adds 2 years free.
• Weight. The four rivals run from 77 lb to 132 lb. EcoFlow lists the DELTA Pro at about 99 lb (45 kg), in the middle of that range.
• Price. We do not compare these rivals’ prices model by model here. At brand level, across the EcoFlow models we track prices for, the median is about $0.71 per Wh as of October 2026, against $0.57 for Jackery, $0.47 for Anker SOLIX, $0.38 for ALLPOWERS and $0.37 for Mango Power, from a single model. EcoFlow sits above all four, so its range as a whole costs more per watt-hour. That is a brand median, not a statement about this bundle.

The brand-level view is in EcoFlow vs Jackery and EcoFlow vs Anker SOLIX.

DELTA Pro or DELTA Pro 3?

This is the comparison that matters most. The DELTA Pro 3 is the newer generation, and it matches or beats the DELTA Pro on capacity, output, cycle rating, solar input and warranty; the DELTA Pro is about 14 lb lighter and, at EcoFlow’s own store prices, cheaper per watt-hour.

The prices are EcoFlow’s US store listings on October 15, 2026: the sale price, with the regular price in parentheses. Sale prices change and the gap between the two models moves with them, so compare the store’s figures on the day you buy.

EcoFlow’s product pages list a 5-year warranty for both: 3 years standard plus 2 more with registration in the EcoFlow app. The Pro 3’s surge and AC-input figures are from its spec page, checked October 2026. EcoFlow’s product title for the Pro 3 also mentions UL 9540, a safety standard for energy-storage systems that some home-backup installs and inspectors ask about. The DELTA Pro’s title does not. If a permit or an insurer cares, get the certification confirmed in writing for whichever you choose.

On EcoFlow’s store prices in the table, the DELTA Pro costs about 27 percent less per watt-hour, so the question is whether you need what the Pro 3’s premium buys: 240V from one unit, 2,600W of solar input against 1,600W, a 10ms switchover against 30ms and 4,000 rated cycles against 3,500, on top of 496Wh more storage and 400W more output. If you need any of those, buy the EcoFlow DELTA Pro 3. If 3,600Wh at 120V covers your loads, the DELTA Pro does the job for less, and it is the natural pick if you already own DELTA Pro extra batteries and want to keep stacking.

Who should buy something else

• Anyone who has to carry it. EcoFlow lists the DELTA Pro at about 99 lb (45 kg), which makes it a two-person lift. For something you can carry, the EcoFlow DELTA 3 Classic is 1,024Wh at 26.7 lb, and the EcoFlow DELTA 3 Max is 2,048Wh at 44.8 lb.
• Anyone who wants the highest rated cycle life. The Mango Power E and the Jackery HomePower 3600 Plus publish 6,000 cycles, and the Mango Power adds a 10-year warranty. EcoFlow rates the DELTA Pro’s LFP pack at 3,500 cycles to 80% capacity (6,500 to 50%); our chemistry comparison explains why the cycle figure matters.
• Anyone who needs more than 3,600W. The Anker SOLIX F3800 lists 6,000W continuous and 9,000W surge. Loads that stack past its ceiling are the problem: a heater and a microwave running while a fridge compressor starts (1,500 + about 1,500 + about 1,500 = 4,500W) can exceed 3,600W.
• Anyone with a large solar plan. The Anker F3800 lists 2,400W of solar input and the Mango Power E and ALLPOWERS R4000 list 2,000W. EcoFlow lists the DELTA Pro at 1,600W, and the 400W in the bundle name is small next to any of them.
• Anyone who only needs a night. A 2,048Wh unit gives 2,048 × 0.85 = 1,741Wh usable, 71 percent of the 2,450Wh day above, in a package such as the DELTA 3 Max at 44.8 lb.
• Anyone trying to back up a house. A power station on extension cords covers a few circuits. Feeding a panel needs a transfer switch or inlet and an electrician; start with home battery backup and manual transfer switches, and read the honest answer on powering a house.

Who the DELTA Pro suits

It suits a household that wants roughly 30 hours of essentials from the battery alone, wants to stretch that with panels, and wants the option to add storage later. A 1,500W appliance sits well inside its 3,600W continuous rating, and so does a fridge compressor’s start-up draw alongside a router and a TV. It does not suit anyone who needs to move it often, anyone who wants the highest rated cycle life, anyone who needs 240V from a single unit, or anyone who can get the Pro 3 for similar money. The size question underneath all of this is covered in what size power station you need. If the bundle fits, EcoFlow DELTA Pro solar generator bundle shows what is in the box at the retailer.

Questions to ask before buying

These six questions change the decision. EcoFlow’s spec page and manual answer the first five and the extra-battery part of the last (see above); check the box contents with the retailer before you pay:

1. What is the surge rating? It decides whether a fridge compressor or a pump starts cleanly while other loads are running.
2. What are the cell chemistry and the rated cycle life? Together they decide how long the pack stays useful.
3. What are the maximum solar input in watts and the voltage window? They decide how many panels it takes and how fast it refills.
4. What is the AC input in watts? It decides the recharge time between outages.
5. Which outlets and voltages does it have? It decides whether a 240V load can run at all. On the DELTA Pro, all five AC outlets are 120V.
6. What is in the bundle’s box, and which extra batteries work with this unit, and how many?

DELTA Pro questions

Is the DELTA Pro Solar Generator the power station or a bundle?

It is a bundle: the retailer’s title marks it as a solar generator, the power station paired with 400W of solar panels. EcoFlow’s own store sells a DELTA Pro + 400W Portable Solar Panel bundle, but check the retailer’s page for the panel count and model before you compare it with a power-station-only price.

Can 400W of panels refill the DELTA Pro in a day?

No. At 75 percent of rated output, 400W gives about 300W, and 4 to 5 sun hours yields 1,200 to 1,500Wh, so refilling 3,600Wh from empty takes 2.4 to 3.0 summer days and 4 to 6 winter days. A full single-day refill from empty needs about 1,200W of panels in summer (900W effective for 4 sun hours), which is within the DELTA Pro’s 1,600W solar input limit.

Can it run a fridge and a well pump at the same time?

On the running figures, yes: 150W plus 1,000W is 1,150W, well under 3,600W. The risk is the start-up. A fridge compressor starts at about 1,500W and a 1/2 hp well pump at about 3,000W, about 4,500W if both start at once, inside the 7,200W surge rating EcoFlow lists. A 1 hp pump starts at about 6,000W, and with the fridge starting at the same moment that is about 7,500W, over the rating, so check the pump’s nameplate or manual. A 240V pump is a different matter: all five of the DELTA Pro’s AC outlets are 120V, so it needs a second DELTA Pro joined through EcoFlow’s Double Voltage Hub or Smart Home Panel, or a DELTA Pro 3.

Is a DELTA Pro bought now still worth it with the Pro 3 available?

Yes, if 3,600Wh at 120V covers what you run. At EcoFlow’s October 2026 store prices it costs about 27 percent less per watt-hour than the Pro 3, and it extends an existing set of DELTA Pro batteries. The Pro 3 is worth its premium if you need 240V from one unit, more than 1,600W of solar input, a 10ms switchover or its higher cycle rating (4,000 cycles to 80%, against 3,500).