EcoFlow
Drawing · 15.7 × 8 × 11.2 in · 27.6 lb
EcoFlow DELTA 3
$564 $699 at EcoFlow
- Capacity
- 1,024 Wh
- AC output
- 1,800 W
- Surge
- 3,600 W
- Solar input
- 500 W
- Weight
- 27.6 lb
Leads on 2 of the 16 fields below.
Model comparison
EcoFlow DELTA 3 vs EcoFlow DELTA 3 Classic
EcoFlow's DELTA 3 against the DELTA 3 Classic: the same 1,024 Wh and 1,800 W. The DELTA 3 Classic is the cheaper energy, 20% less per watt-hour at the makers' prices. Nothing on the DELTA 3's spec sheet beats it by a margin you would notice, so on the published figures the DELTA 3 Classic is the buy.
Capacity
1,024 Wh
1,024 Wh
AC output
1,800 W
1,800 W
Surge
3,600 W
3,600 W
Solar input
500 W
500 W
Weight
27.6 lb
26.7 lb
EcoFlow
Drawing · 15.7 × 7.9 × 11.1 in · 26.7 lb
EcoFlow DELTA 3 Classic
$449 $599 at EcoFlow
- Capacity
- 1,024 Wh
- AC output
- 1,800 W
- Surge
- 3,600 W
- Solar input
- 500 W
- Weight
- 26.7 lb
Buy it if you want the most stored energy per dollar ($0.44 against $0.55 per Wh).
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Field by field
Compare the differences that matter for your devices; EcoFlow DELTA 3 leads on 2, EcoFlow DELTA 3 Classic on 3, and the rest are equal or not comparable.
| Field | DELTA 3 | DELTA 3 Classic |
|---|---|---|
| Capacity | 1,024 Wh | 1,024 Wh |
| Output (surge) | 1,800 W (3,600 surge) | 1,800 W (3,600 surge) |
| Weight | 27.6 lb | 26.7 lb |
| Price | $564 | $449 |
| Price per Wh | $0.55 | $0.44 |
| Chemistry | LiFePO4 | LiFePO4 |
| Rated cycles | 4,000 to 80% | – |
| Max solar input | 500 W | 500 W |
| Max AC input | 1,500 W | 1,400 W |
| Wall recharge | 56 min to full | 1 h to full |
| Expandable | yes, to 5,000 Wh | – |
| UPS switchover | 10 ms | 10 ms |
| AC outlets | 6 | – |
| USB-C ports | 2 | 2 |
| Warranty | 5 years | 5 years |
| Dimensions | 15.7 x 8.0 x 11.2 in | 15.7 x 7.9 x 11.1 in |
Cycle counts are highlighted only when both makers rate them to the same remaining capacity. A full recharge is not ranked against a charge to 80%. Missing figures never count as an advantage. These are manufacturer ratings; matching endpoints do not prove identical test conditions.
Rated cycles: DELTA 3, 4,000 to 80%; DELTA 3 Classic, –.
Comparison inputs and calculations
| Field | DELTA 3 | DELTA 3 Classic | Meaning |
|---|---|---|---|
| Capacity | DELTA 3: specification record · checked 6 Sep 2026 | DELTA 3 Classic: specification record · checked 6 Sep 2026 | Manufacturer figure; unknown remains unknown |
| Output (surge) | DELTA 3: specification record · checked 6 Sep 2026 | DELTA 3 Classic: specification record · checked 6 Sep 2026 | Manufacturer figure; unknown remains unknown |
| Weight | DELTA 3: specification record · checked 6 Sep 2026 | DELTA 3 Classic: specification record · checked 6 Sep 2026 | Manufacturer figure; unknown remains unknown |
| Price | DELTA 3: price record · checked 7 Oct 2026 | DELTA 3 Classic: price record · checked 7 Oct 2026 | Manufacturer figure; unknown remains unknown |
| Price per Wh | DELTA 3: price record · checked 7 Oct 2026 | DELTA 3 Classic: price record · checked 7 Oct 2026 | Price ÷ rated Wh; calculated, not measured |
| Chemistry | DELTA 3: specification record · checked 6 Sep 2026 | DELTA 3 Classic: specification record · checked 6 Sep 2026 | Manufacturer figure; unknown remains unknown |
| Rated cycles | DELTA 3: specification record · checked 6 Sep 2026 | DELTA 3 Classic: specification record · checked 6 Sep 2026 | Stated cycles and remaining-capacity percentage; conditions may differ |
| Max solar input | DELTA 3: specification record · checked 6 Sep 2026 | DELTA 3 Classic: specification record · checked 6 Sep 2026 | Manufacturer figure; unknown remains unknown |
| Max AC input | DELTA 3: specification record · checked 6 Sep 2026 | DELTA 3 Classic: specification record · checked 6 Sep 2026 | Manufacturer figure; unknown remains unknown |
| Wall recharge | DELTA 3: specification record · checked 6 Sep 2026 | DELTA 3 Classic: specification record · checked 6 Sep 2026 | Keep the full or 80% charge endpoint |
| Expandable | DELTA 3: specification record · checked 6 Sep 2026 | DELTA 3 Classic: specification record · checked 6 Sep 2026 | Manufacturer figure; unknown remains unknown |
| UPS switchover | DELTA 3: specification record · checked 6 Sep 2026 | DELTA 3 Classic: specification record · checked 6 Sep 2026 | Manufacturer figure; unknown remains unknown |
| AC outlets | DELTA 3: specification record · checked 6 Sep 2026 | DELTA 3 Classic: specification record · checked 6 Sep 2026 | Manufacturer figure; unknown remains unknown |
| USB-C ports | DELTA 3: specification record · checked 6 Sep 2026 | DELTA 3 Classic: specification record · checked 6 Sep 2026 | Manufacturer figure; unknown remains unknown |
| Warranty | DELTA 3: specification record · checked 6 Sep 2026 | DELTA 3 Classic: specification record · checked 6 Sep 2026 | Manufacturer figure; unknown remains unknown |
| Dimensions | DELTA 3: specification record · checked 6 Sep 2026 | DELTA 3 Classic: specification record · checked 6 Sep 2026 | Manufacturer figure; unknown remains unknown |
Estimated AC energy = rated Wh × 0.85. Runtime = estimated AC energy ÷ load W, with no reserve. Capacity and weight differences use the displayed figures; price per Wh uses each model's own price record and date. Device-load inputs are in the sizing calculator.
- Capacity: DELTA 3 Classic minus DELTA 3 = 0 Wh (0% of the DELTA 3 figure).
- Carry weight: DELTA 3 Classic minus DELTA 3 = -0.9 lb (-3.3% of the DELTA 3 figure).
- Price per Wh: DELTA 3 Classic minus DELTA 3 = -0.11 USD/Wh (-20.4% of the DELTA 3 figure).
Will it run your gear?
Check whether each unit has enough battery and output for the devices you want to run.
| Job | Needs | DELTA 3 | DELTA 3 Classic |
|---|---|---|---|
| a day of home backup (a full-size refrigerator, a router, phones and lights for a day) | 2,323 Wh, 92 W running, 1,351 W start | no: too little capacity | no: too little capacity |
| a night of CPAP (a CPAP with its humidifier for one 8-hour night) | 599 Wh, 53 W running, 104 W start | yes | yes |
| two nights of camping (a compressor cooler, lights, phones, a laptop and a fan for two nights) | 2,066 Wh, 157 W running, 157 W start | no: too little capacity | no: too little capacity |
| a day in an RV (a 12 V fridge, lights, TV, coffee maker, phones and a laptop for a day) | 648 Wh, 156 W running, 156 W start | yes | yes |
| a working day in a van (a working day of laptop, Starlink, fridge, lights and a fan) | 2,295 Wh, 244 W running, 244 W start | no: too little capacity | no: too little capacity |
| a laptop and two phones (a laptop for six hours and two phone charges) | 396 Wh, 60 W running, 60 W start | yes | yes |
Runtime by device
Hours = capacity × 0.85 ÷ device watts, with the draws from the device table; "start" is whether the inverter's surge clears the device.
| Device | Draw W | DELTA 3 h | Start | DELTA 3 Classic h | Start |
|---|---|---|---|---|---|
| CPAP machine (with heated humidifier) (with humidifier) | 53 | 16.4 | yes | 16.4 | yes |
| Refrigerator (full-size, ENERGY STAR, ~18 cu ft top freezer) (average draw) | 41 | 21.1 | yes | 21.1 | yes |
| Laptop (MacBook Air, charging) | 40 | 21.8 | yes | 21.8 | yes |
| Wi-Fi router | 24 | 36.3 | yes | 36.3 | yes |
| Starlink Standard kit (dish + router) | 88 | 9.9 | yes | 9.9 | yes |
| TV, 50-inch LED / Crystal UHD | 89 | 9.8 | yes | 9.8 | yes |
| Space heater, 1500 W | 1,500 | 0.6 | yes | 0.6 | yes |
Buy the DELTA 3 if…
The numbers give it no field over the DELTA 3 Classic; buy it for brand, looks or availability.
Buy the DELTA 3 Classic if…
- you want the most stored energy per dollar ($0.44 against $0.55 per Wh)
- the $115 difference matters more than the specs
- you carry it more than you run it (26.7 lb against 27.6 lb)
More tracked models from both brands: EcoFlow and EcoFlow. Every unit at this size: the full table. Your own devices: the sizing calculator.
Questions buyers ask
Which is better for power outages, the DELTA 3 or the DELTA 3 Classic?
EcoFlow DELTA 3 states a 10 ms switchover, so it can sit between the wall and a fridge, router or CPAP and take over when the power cuts; EcoFlow DELTA 3 Classic states 10 ms. Capacity: 1,024 Wh each. Check your appliance's start-up watts against the surge figures in the table.
Which is cheaper per watt-hour?
DELTA 3 Classic at $0.44 per Wh against $0.55. This compares purchase price with rated capacity, not lifetime delivered energy.
Can either run a window air conditioner?
A small window unit draws 500 to 1,000 W running and several times that for an instant at start; check the surge figure in the table against the air conditioner's label. Either way an afternoon of it empties a 1 kWh unit; the RV page works the rooftop version.