Specifications checked against manufacturer pages on 2026-08-23.
The EcoFlow DELTA 3 (1,024 Wh, 1,800 W) and the EcoFlow DELTA 3 Plus (1,024 Wh, 1,800 W), compared on the figures their makers publish. On the normalized ratios, the DELTA 3 costs less per watt-hour ($0.68/Wh vs $0.78/Wh).
In short. The DELTA 3 leads on every normalized measure that could be decided: cost per watt-hour ($0.68/Wh vs $0.78/Wh) and continuous watts per dollar (2.58 W/$ vs 2.25 W/$). The other 4 of 6 tie or cannot be compared. Read the runtime table before deciding — a clean sweep on ratios does not mean the other unit fails your outage.
Check the current price
Links go to the exact base unit we compared, not a bundle. Amazon prices change daily.
Specifications, side by side
Numbered notes below the table give the source location or a caveat for figures that need one; check marks mark the better figure where one can be judged; “Manufacturer does not state” means absent from that maker’s page as of its check date listed under Sources. UPS switchover is how long the outlets go dark when grid power drops.
| Specification | EcoFlow DELTA 3 | EcoFlow DELTA 3 Plus |
|---|---|---|
| Rated capacity | 1,024 Wh1 | 1,024 Wh2 |
| Usable capacity (calculated)* | 870–922 Wh | 870–922 Wh |
| Continuous AC output | 1,800 W3 | 1,800 W4 |
| Surge output | 3,600 W5 | 3,600 W6 |
| Full recharge from wall | 56 min7 | 56 min8 |
| Cell chemistry | LiFePO49 | LiFePO410 |
| Rated cycle life | 4,000 cycles to 80%+11 | 4,000 cycles to 80%12 |
| UPS switchover | <10 ms13 | <10 ms14 |
| Expandable | Yes, up to 5,000 Wh15 | Yes, up to 5,000 Wh16 |
| Max solar input | 500 W17 | 1,000 W18 ✓ |
| Max AC charging input | 1,500 W19 | 1,500 W20 |
| AC outlets | 621 | 622 |
| Highest USB-C port | 100 W23 | 140 W24 ✓ |
| App control | Yes25 | Yes26 |
| Stated noise | <30 dB27 | <30 dB28 |
| Warranty | 5 years29 | 5 years30 |
| Weight | about 27.6 lb31 | about 27.6 lb32 |
| Manufacturer list price when checked | $69933 ✓ | $79934 |
* Calculated: rated capacity × an assumed 85–90% conversion efficiency; no maker publishes a usable figure.
Notes on the figures
- DELTA 3, rated capacity: 1024 Wh
- DELTA 3 Plus, rated capacity: 1024Wh
- DELTA 3, continuous output: 1800W total
- DELTA 3 Plus, continuous output: 1800W
- DELTA 3, surge: Surge 3600W
- 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, full recharge: With the 1,500 W AC input setting.
- DELTA 3 Plus, full recharge: With the 1,500 W AC input setting.
- DELTA 3, cell chemistry: LFP (LiFePO4 battery)
- DELTA 3 Plus, cell chemistry: Third-gen LiFePO4 (LFP) cells offer fast charging without sacrificing longevity.
- DELTA 3, cycle life: 4000 cycles to 80+% capacity
- 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, UPS switchover: Stated as under 10 ms; an upper bound.
- DELTA 3 Plus, UPS switchover: Stated as under 10 ms; an upper bound.
- DELTA 3, expandable: Up to 5kWh
- DELTA 3 Plus, expandable: up to 5kWh expandable
- DELTA 3, solar input: DC Charge Input, 11V-60V 500W Max
- DELTA 3 Plus, solar input: 2 ports, DC Charge Input, 11V-60V 500W Max*2
- DELTA 3, AC input: 1500W
- DELTA 3 Plus, AC input: 1500W
- DELTA 3, AC outlets: 6 outlets, 1800W total (Surge 3600W)
- DELTA 3 Plus, AC outlets: 6 outlets, 1800W total (Surge 3600W)
- DELTA 3, USB-C: 2 ports, 100W Max
- DELTA 3 Plus, USB-C: 2 ports, 140W Max
- DELTA 3, app: APP (TOU / Storm Warning Alert)
- DELTA 3 Plus, app: APP (TOU / Storm Warning Alert)
- DELTA 3, 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, 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, warranty: 5 years
- DELTA 3 Plus, warranty: 5 years
- DELTA 3, weight: Manufacturer states ‘approx.’
- DELTA 3 Plus, weight: Manufacturer states ‘approx.’
- DELTA 3, price: Manufacturer list price when checked; on sale at $569 that day.
- DELTA 3 Plus, price: Manufacturer list price when checked; on sale at $669 that day.
The same specs, normalized
Ratios, so the bigger unit does not win by default.
| Measure | DELTA 3 | DELTA 3 Plus |
|---|---|---|
| Cost per watt-hour | $0.68/Wh ✓ | $0.78/Wh |
| Watt-hours per pound | 37.1 Wh/lb | 37.1 Wh/lb |
| Surge headroom | 2.00× | 2.00× |
| Recharge rate | 18.3 Wh/min | 18.3 Wh/min |
| Rated cycle life | 4,000 | 4,000 |
| Continuous watts per dollar | 2.58 W/$ ✓ | 2.25 W/$ |
Definitions and direction of each ratio: How we verify.
What each one runs, for how long
| Appliance | DELTA 3 | DELTA 3 Plus |
|---|---|---|
| Full-size refrigerator 150 W, 900 W start, 35% duty · eff. 80%–87% |
16–17 hr | 16–17 hr |
| Mini fridge 70 W, 400 W start, 30% duty · eff. 70%–82% |
34–40 hr | 34–40 hr |
| CPAP without humidifier 40 W · eff. 70%–82% |
18–21 hr | 18–21 hr |
| CPAP with heated humidifier 95 W · eff. 80%–87% |
8.6–9.4 hr | 8.6–9.4 hr |
| Gas furnace blower 400 W, 1600 W start, 40% duty · eff. 85%–90% |
5.4–5.8 hr | 5.4–5.8 hr |
| 1/3 hp sump pump 500 W, 1800 W start, 15% duty · eff. 85%–90% |
about 12 hr | about 12 hr |
| Router and modem 20 W · eff. 70%–82% |
36–42 hr | 36–42 hr |
| Laptop 60 W · eff. 70%–82% |
12–14 hr | 12–14 hr |
| 1500W space heater 1500 W · eff. 82%–88% |
about 0.6 hr | about 0.6 hr |
Calculated, not measured: hours = rated Wh × efficiency ÷ (appliance W × duty); assumptions on How we verify. “Unlikely to start”: start-up surge exceeds the stated surge rating.
What the differences mean
Price per watt-hour. At the list prices we checked, the DELTA 3 costs $0.68/Wh against $0.78/Wh for the DELTA 3 Plus. At list the DELTA 3 is $100 cheaper ($699 vs $799) for 1,024 Wh vs 1,024 Wh. Prices move with sales; the ratio moves with them.
Output for the money. 2.58 W/$ on the DELTA 3 against 2.25 W/$ on the DELTA 3 Plus: this is the ratio to read if your outage plan is one big appliance, not many small ones.
Which one, and for whom
On normalized measures the DELTA 3 leads on cost per watt-hour ($0.68/Wh vs $0.78/Wh) and continuous watts per dollar (2.58 W/$ vs 2.25 W/$). The DELTA 3 Plus does not lead on any decided measure. The deciding figure is the one your own outage will test first:
- CPAP overnight. Switchover: DELTA 3 under 10 ms, DELTA 3 Plus under 10 ms. A 40 W CPAP runs roughly 18–21 hr on the DELTA 3 and 18–21 hr on the DELTA 3 Plus. Both makers state a 10 ms upper bound, so for one night’s CPAP the deciding figures are price and solar input.
- Keeping a refrigerator cold. The compressor has to start before hours matter. Both state a 3,600 W surge and both calculate to 16–17 hr on a full-size refrigerator, so this scenario does not separate them.
- A multi-day outage with a generator or solar to recharge from. Full recharge: DELTA 3 56 min, DELTA 3 Plus 56 min. Both state the same time; the DELTA 3 puts more energy back in it (1,024 Wh vs 1,024 Wh).
Check the current price
Links go to the exact base unit we compared, not a bundle. Amazon prices change daily.
Related reading
A 1,024 Wh battery cannot do what a gasoline generator does — the runtime table shows a 1,500 W space heater emptying either unit in about 0.6 hr — but it also cannot poison a household. How often gasoline generators kill indoors — and how the official count keeps being revised — is documented in our CPSC revision matrix, and this page puts every verified unit on the same refrigerator scenario.
Other comparisons with these models
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: manufacturer product page, checked 2026-08-23.
- EcoFlow DELTA 3 Plus: manufacturer product page, checked 2026-08-23.
Published specifications only; no bench tests. Method: How we verify. More: Comparisons.