Specifications checked against manufacturer pages on 2026-08-23.
The EcoFlow DELTA 3 Plus is a 1,024 Wh portable power station in the 1 kWh-class bracket, with a 1,800 W continuous inverter and LiFePO4 cells. This page transcribes the manufacturer’s specifications as they stood on 2026-08-23, turns the capacity into appliance hours, and names the rows EcoFlow does not fill in. Quoted figures carry a source; calculated ones carry a formula.
In short. 1,024 Wh in the 1 kWh-class band: $0.78/Wh at the list price we recorded; 37.1 Wh per pound; 4,000 rated cycles to 80%. On our assumptions a full-size refrigerator calculates to 16–17 hr, and a 40 W CPAP calculates to 18–21 hr. Hours are calculated from rated capacity, never measured.
Check the current price
The link goes to the exact base unit whose specifications are on this page, not a bundle. Amazon prices change daily.
Who it is for, and who should skip it
Two lists, both drawn from the table further down.
It fits if
- A refrigerator is what you are saving. It clears a 12-hour outage on our assumptions with about 4 hours to spare, and the stated 3,600 W surge covers a roughly 900 W start.
- One night of uninterrupted medical equipment. A 40 W machine without a humidifier runs the night with margin, and the maker states under 10 ms on the grid handover. A heated humidifier changes that arithmetic.
- The unit has to move. 27.6 lb is a two-hands lift rather than a cart job, so car to porch to basement is realistic.
Skip it if
- You want resistive heat. A 1,500 W heater empties this unit in about 0.6 hr. Heat is what batteries are worst at.
- You own a large array already. It takes at most 1,000 W of solar; panels past that ceiling idle rather than charge it faster.
- You were counting on the furnace. Hard-wired appliances cannot be reached with a cord; that job needs an interlock or transfer switch and an electrician, on any unit.
Every published specification
Each footnote below points at the sentence a figure came from. Two phrases matter: “Manufacturer does not state” means the maker is silent, “Not yet verified by CalmWatt” means we are.
| Specification | EcoFlow DELTA 3 Plus |
|---|---|
| Rated capacity | 1,024 Wh1 |
| Usable capacity (calculated)* | 870–922 Wh |
| Continuous AC output | 1,800 W2 |
| Surge output | 3,600 W3 |
| Full recharge from wall | 56 min4 |
| Cell chemistry | LiFePO45 |
| Rated cycle life | 4,000 cycles to 80%6 |
| UPS switchover | <10 ms7 |
| Expandable | Yes, up to 5,000 Wh8 |
| Max solar input | 1,000 W9 |
| Max AC charging input | 1,500 W10 |
| AC outlets | 611 |
| Highest USB-C port | 140 W12 |
| App control | Yes13 |
| Stated noise | <30 dB14 |
| Warranty | 5 years15 |
| Weight | about 27.6 lb16 |
| Manufacturer list price when checked | $79917 |
* Our calculation, not a published figure: rated capacity × an assumed 85–90% conversion efficiency.
Notes on the figures
- DELTA 3 Plus, rated capacity: 1024Wh
- DELTA 3 Plus, continuous output: 1800W
- DELTA 3 Plus, surge: EcoFlow’s X-Boost raises sustained output to 2,200 W for resistive loads; 3,600 W is the surge figure. The two are different things.
- DELTA 3 Plus, full recharge: With the 1,500 W AC input setting.
- DELTA 3 Plus, cell chemistry: Third-gen LiFePO4 (LFP) cells offer fast charging without sacrificing longevity.
- DELTA 3 Plus, cycle life: With 4000 cycles to 80% capacity, enjoy up to 10 years of reliable use, 25% above the industry standard.
- DELTA 3 Plus, UPS switchover: Stated as under 10 ms; an upper bound.
- DELTA 3 Plus, expandable: up to 5kWh expandable
- DELTA 3 Plus, solar input: 2 ports, DC Charge Input, 11V-60V 500W Max*2
- DELTA 3 Plus, AC input: 1500W
- DELTA 3 Plus, AC outlets: 6 outlets, 1800W total (Surge 3600W)
- DELTA 3 Plus, USB-C: 2 ports, 140W Max
- DELTA 3 Plus, app: APP (TOU / Storm Warning Alert)
- DELTA 3 Plus, noise: Stated as under 30 dB at 600 W output and under 40 dB at 1,200 W; an upper bound at a stated load.
- DELTA 3 Plus, warranty: 5 years
- DELTA 3 Plus, weight: Manufacturer states ‘approx.’
- DELTA 3 Plus, price: Manufacturer list price when checked; on sale at $669 that day.
What no maker states
A specification sheet is as informative in what it omits as in what it lists. One row stays empty here, and it stays empty on every rival’s page too. Worth noting: 29 of 34 units in our database leave a row blank. This one fills every row we track.
- Usable capacity. No maker in our database publishes one. Rated capacity is the cells; what reaches the outlet is less, and the gap moves with the load.
No manufacturer publishes it, so a page quoting one has calculated it and usually will not say from what. Ours is calculated too, which is why the assumption is printed next to it.
What it runs, and for how long
Same appliances and assumptions we use on every comparison page, so these rows read against any other unit on this site.
| Appliance | DELTA 3 Plus |
|---|---|
| Full-size refrigerator 150 W, 900 W start, 35% duty · eff. 80%–87% |
16–17 hr |
| Mini fridge 70 W, 400 W start, 30% duty · eff. 70%–82% |
34–40 hr |
| CPAP without humidifier 40 W · eff. 70%–82% |
18–21 hr |
| CPAP with heated humidifier 95 W · eff. 80%–87% |
8.6–9.4 hr |
| Gas furnace blower 400 W, 1600 W start, 40% duty · eff. 85%–90% |
5.4–5.8 hr |
| 1/3 hp sump pump 500 W, 1800 W start, 15% duty · eff. 85%–90% |
about 12 hr |
| Router and modem 20 W · eff. 70%–82% |
36–42 hr |
| Laptop 60 W · eff. 70%–82% |
12–14 hr |
| 1500W space heater 1500 W · eff. 82%–88% |
about 0.6 hr |
Arithmetic, not a measurement: hours = rated Wh × efficiency ÷ (appliance W × duty). Appliance and efficiency assumptions live on How we verify. A row reading “Unlikely to start” failed the surge check, not the capacity one.
The same specs, normalized
| Measure | DELTA 3 Plus |
|---|---|
| Cost per watt-hour | $0.78/Wh |
| Watt-hours per pound | 37.1 Wh/lb |
| Surge headroom | 2.00× |
| Recharge rate | 18.3 Wh/min |
| Rated cycle life | 4,000 cycles to 80% |
| Continuous watts per dollar | 2.25 W/$ |
Ratios have no winner here — there is no second column. Each one is defined, with its direction, on How we verify.
What those figures actually mean
Cost per watt-hour: $0.78/Wh. The $799 list price we recorded over 1,024 Wh of rated capacity. This is the number to carry between listings; a discount changes it in proportion, so ours is only true for the day we recorded it.
Watt-hours per pound: 37.1 Wh/lb. 1,024 Wh in 27.6 lb makes this a two-hands lift. Density is what lithium iron phosphate gives up to older chemistries; the cycle rating is what it buys in return.
Surge headroom: 2.00×. A stated 3,600 W surge over a 1,800 W continuous rating, which covers the roughly 900 W a full-size refrigerator needs to start. Capacity is irrelevant if the motor never turns.
Recharge rate: 18.3 Wh/min. A full wall charge in 56 minutes. In a multi-day outage this is generator fuel measured in minutes.
Rated cycle life: 4,000 cycles to 80% capacity. Cycled weekly it would take about 77 years to get there, so for a few outages a year the cell count is not the limit. For daily off-grid use it is. The percentage matters as much as the count: two ratings only compare when they name the same remaining capacity.
Continuous watts per dollar: 2.25 W/$. Output for the money rather than storage for the money. Which of the two you should read depends on whether your outage is a big load or a long one.
Where it sits in our database
The obvious missing question on a one-unit page is whether these numbers are good. Here is where each lands among the units we have verified.
| Measure | DELTA 3 Plus | Among verified units |
|---|---|---|
| Rated capacity | 1,024 Wh | 24th largest of 34 |
| Continuous AC output | 1,800 W | 23rd highest of 34 |
| Cost per watt-hour | $0.78/Wh | 22nd cheapest of 32 |
| Watt-hours per pound | 37.1 Wh/lb | 18th densest of 34 |
| Weight | 27.6 lb | 16th lightest of 34 |
A low rank on weight is a high rank on portability. Nothing in this table is a verdict. The row built on price uses the manufacturer list price recorded on 2026-08-23; the retail price behind our link moves independently, so recompute that row against what you are shown.
Three outages, and the figure that decides each
- One night, one CPAP. A 40 W CPAP without a humidifier calculates to 18–21 hr. The stated under 10 ms handover is what decides whether the machine notices the outage.
- Twelve hours, one refrigerator. A typical full-size refrigerator calculates to 16–17 hr, and the stated 3,600 W surge covers its roughly 900 W start.
- The loads people forget. A gas furnace blower calculates to 5.4–5.8 hr and a one-third horsepower sump pump calculates to about 12 hr. Neither is a cord-and-plug load in a typical house, whatever these hours say. A router and modem, meanwhile, calculates to 36–42 hr.
- Three days, with something to recharge from. A full wall recharge takes 56 minutes, and it accepts up to 1,000 W of solar, so day two turns on your panels and your sky.
The DELTA 3 Plus against other units
8 pages on this site compare the DELTA 3 Plus directly with another unit, using the table above on both sides.
- Anker SOLIX C1000 Gen 2 vs EcoFlow DELTA 3 Plus
- Anker SOLIX C1000 vs EcoFlow DELTA 3 Plus
- Bluetti AC180 vs EcoFlow DELTA 3 Plus
- Bluetti AC180P vs EcoFlow DELTA 3 Plus
- Bluetti Elite 100 V2 vs EcoFlow DELTA 3 Plus
- Bluetti Elite 200 V2 vs EcoFlow DELTA 3 Plus
- EcoFlow DELTA 2 Max vs EcoFlow DELTA 3 Plus
- EcoFlow DELTA 3 vs EcoFlow DELTA 3 Plus
Questions people ask about the DELTA 3 Plus
Answers use only the figures on this page.
How long will the DELTA 3 Plus run a refrigerator?
16–17 hr on our assumptions for a typical full-size unit at 150 W running and a 35% duty cycle. The stated surge covers the roughly 900 W start. Your own compliance label is the number that matters.
Can the DELTA 3 Plus run a CPAP all night?
Yes on capacity: a 40 W machine without a humidifier calculates to 18–21 hr against the eight hours a night usually needs. The maker states under 10 ms on the handover. A heated humidifier roughly doubles the draw.
How long does the DELTA 3 Plus take to recharge?
56 minutes from a wall outlet on the maker’s figure, with up to 1,000 W accepted from solar. In a long outage that sets how long a generator runs per refill.
How much does the DELTA 3 Plus weigh?
27.6 lb on the maker’s figure, or 37.1 Wh of rated capacity carried per pound. That is a two-hands lift, which is why units this size tend to stay where you put them.
How many cycles is the DELTA 3 Plus rated for?
4,000 cycles to 80% of original capacity, on LiFePO4 cells, which is roughly 77 years at one cycle a week. Compare it only with ratings quoted to the same remaining capacity.
Can you expand the DELTA 3 Plus’s capacity?
Yes, to a stated 5,000 Wh with the maker’s expansion battery, up from 1,024 Wh alone. Confirm the matching battery is on sale before counting on it.
Check the current price
The link goes to the exact base unit whose specifications are on this page, not a bundle. Amazon prices change daily.
Related reading
Against a gasoline generator this loses on endurance — a 1,500 W space heater empties it in about 0.6 hr — and wins on the one thing that kills people every winter. Our CPSC revision matrix tracks how the official count of generator carbon-monoxide deaths has changed across report editions, and this page puts every verified unit, including this one, on one refrigerator scenario.
Ordering before a storm? Check the arrival date at checkout — a unit that ships tomorrow can beat a better one that ships next week. Amazon Prime includes fast delivery on eligible items and starts with a free trial; we earn a commission if you join.
Sources and method
- EcoFlow DELTA 3 Plus: manufacturer product page, checked 2026-08-23.
We compared published specs and copied each figure from the manufacturer’s page. Runtimes are our arithmetic, not a measurement, and the formula is on the page so you can substitute your own load. Method: How we verify. More: Comparisons.