Drawing · 19.6 × 9.5 × 12 in · 50 lb
$1,029 $1,299 at EcoFlow
- Capacity
- 2,048 Wh
- Output
- 2,400 W (4,800 surge)
- Weight
- 50 lb
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EcoFlow DELTA 2 Max vs EcoFlow DELTA Pro 3
EcoFlow's two expandable steps toward home backup: the 2 kWh DELTA 2 Max against the 4 kWh DELTA Pro 3. The DELTA 2 Max is the cheaper energy, 26% less per watt-hour at the makers' prices, and is 63.5 lb lighter. The DELTA Pro 3 holds 2,048 Wh more, gives 1,600 W more continuous output and takes 2,600 W of solar against 1,000 W: buy it for that, and the DELTA 2 Max for the money.
Drawing · 16.2 × 13.4 × 27.3 in · 113.5 lb
- Capacity
- 4,096 Wh
- Output
- 4,000 W (8,000 surge)
- Weight
- 113.5 lb
Capacity
2,048 Wh
4,096 Wh
AC output
2,400 W
4,000 W
Surge
4,800 W
8,000 W
Solar input
1,000 W
2,600 W
Weight
50 lb
113.5 lb
EcoFlow
EcoFlow DELTA 2 Max
$1,029 $1,299 at EcoFlow
- Capacity
- 2,048 Wh
- AC output
- 2,400 W
- Surge
- 4,800 W
- Solar input
- 1,000 W
- Weight
- 50 lb
Buy it if you want the most stored energy per dollar ($0.50 against $0.68 per Wh).
EcoFlow
EcoFlow DELTA Pro 3
- Capacity
- 4,096 Wh
- AC output
- 4,000 W
- Surge
- 8,000 W
- Solar input
- 2,600 W
- Weight
- 113.5 lb
Buy it if you need more continuous output (4,000 W continuous and 8,000 W surge, against 2,400 W and 4,800 W).
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Figure by figure
Compare the differences that matter for your devices; EcoFlow DELTA 2 Max leads on 3, EcoFlow DELTA Pro 3 on 5, and the rest are equal or not comparable.
| Figure | DELTA 2 Max | DELTA Pro 3 |
|---|---|---|
| Capacity | 2,048 Wh | 4,096 Wh |
| Output (surge) | 2,400 W (4,800 surge) | 4,000 W (8,000 surge) |
| Weight | 50 lb | 113.5 lb |
| Price | $1,029 | $2,799 |
| Price per Wh | $0.50 | $0.68 |
| Chemistry | LiFePO4 | LiFePO4 |
| Rated cycles | 3,000 to 80% | 4,000 to 80% |
| Max solar input | 1,000 W | 2,600 W |
| Max AC input | 1,800 W | 1,800 W |
| Wall recharge | – | – |
| Expandable | yes, to 6,000 Wh | yes, to 12,000 Wh |
| UPS switchover | – | 10 ms |
| AC outlets | 6 | 7 |
| USB-C ports | 2 | 2 |
| Warranty | 5 years | 5 years |
| Dimensions | 19.6 x 9.5 x 12 in | 16.16 x 13.43 x 27.28 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 2 Max, 3,000 to 80%; DELTA Pro 3, 4,000 to 80%.
How the comparison is worked out
| Figure | DELTA 2 Max | DELTA Pro 3 | Meaning |
|---|---|---|---|
| Capacity | DELTA 2 Max spec sheet | DELTA Pro 3 spec sheet | As the maker states it; a dash where not published |
| Output (surge) | DELTA 2 Max spec sheet | DELTA Pro 3 spec sheet | As the maker states it; a dash where not published |
| Weight | DELTA 2 Max spec sheet | DELTA Pro 3 spec sheet | As the maker states it; a dash where not published |
| Price | DELTA 2 Max price source · checked Oct 11, 2026 | DELTA Pro 3 price source · checked Sep 6, 2026 | As the maker states it; a dash where not published |
| Price per Wh | DELTA 2 Max price source · checked Oct 11, 2026 | DELTA Pro 3 price source · checked Sep 6, 2026 | Price ÷ rated Wh; calculated, not measured |
| Chemistry | DELTA 2 Max spec sheet | DELTA Pro 3 spec sheet | As the maker states it; a dash where not published |
| Rated cycles | DELTA 2 Max spec sheet | DELTA Pro 3 spec sheet | Stated cycles and remaining-capacity percentage; conditions may differ |
| Max solar input | DELTA 2 Max spec sheet | DELTA Pro 3 spec sheet | As the maker states it; a dash where not published |
| Max AC input | DELTA 2 Max spec sheet | DELTA Pro 3 spec sheet | As the maker states it; a dash where not published |
| Wall recharge | DELTA 2 Max spec sheet | DELTA Pro 3 spec sheet | Keep the full or 80% charge endpoint |
| Expandable | DELTA 2 Max spec sheet | DELTA Pro 3 spec sheet | As the maker states it; a dash where not published |
| UPS switchover | DELTA 2 Max spec sheet | DELTA Pro 3 spec sheet | As the maker states it; a dash where not published |
| AC outlets | DELTA 2 Max spec sheet | DELTA Pro 3 spec sheet | As the maker states it; a dash where not published |
| USB-C ports | DELTA 2 Max spec sheet | DELTA Pro 3 spec sheet | As the maker states it; a dash where not published |
| Warranty | DELTA 2 Max spec sheet | DELTA Pro 3 spec sheet | As the maker states it; a dash where not published |
| Dimensions | DELTA 2 Max spec sheet | DELTA Pro 3 spec sheet | As the maker states it; a dash where not published |
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 and the day it was checked. The device draws are in the watt-hour calculator.
- Capacity: DELTA Pro 3 minus DELTA 2 Max = 2,048 Wh (100% of the DELTA 2 Max figure).
- Carry weight: DELTA Pro 3 minus DELTA 2 Max = 63.5 lb (127% of the DELTA 2 Max figure).
- Price per Wh: DELTA Pro 3 minus DELTA 2 Max = 0.18 USD/Wh (36% of the DELTA 2 Max figure).
Will it run your gear?
Check whether each unit has enough battery and output for the devices you want to run.
| Use | Needs | DELTA 2 Max | DELTA Pro 3 |
|---|---|---|---|
| a day of home backup (a full-size refrigerator, a router, phones and lights for a day) | 2,323 Wh, 161 W running, 1,351 W startup | no: too little capacity | yes |
| a night of CPAP (a CPAP with its humidifier for one 8-hour night) | 599 Wh, 53 W running, 104 W startup | yes | yes |
| two nights of camping (camp lights, phones, a laptop and a fan for two nights) | 2,066 Wh, 157 W running, 157 W startup | no: too little capacity | yes |
| a day in an RV (a day of RV lights, TV, phones and a laptop) | 648 Wh, 156 W running, 156 W startup | yes | yes |
| a working day in a van (a working day of laptop, Starlink, lights and a fan) | 1,674 Wh, 189 W running, 189 W startup | yes | yes |
| a laptop and two phones (a laptop for six hours and two phone charges) | 396 Wh, 60 W running, 60 W startup | yes | yes |
Runtime by device
Hours = capacity × 0.85 ÷ device watts, with the draws from the device table; "Start" says whether the output and surge ratings cover the startup figure we use for each device (the refrigerator, 1,300 W startup allowance, from a larger 27 cu ft Whirlpool's tech sheet), so a "yes" there means likely, not certain, to start yours.
| Device | Draw W | DELTA 2 Max h | Start | DELTA Pro 3 h | Start |
|---|---|---|---|---|---|
| CPAP machine (with heated humidifier) | 53 | 32.8 | yes | 65.7 | yes |
| Refrigerator (full-size, ENERGY STAR, ~18 cu ft top freezer) (average draw) | 41 | 42.2 | yes | 84.3 | yes |
| Laptop (MacBook Air, charging) | 40 | 43.5 | yes | 87 | yes |
| Wi-Fi router | 24 | 72.5 | yes | 145.1 | yes |
| Starlink Mini (router built in) | 33 | 53.6 | yes | 107.1 | yes |
| TV, 50-inch LED / Crystal UHD | 89 | 19.6 | yes | 39.1 | yes |
| Space heater, 1500 W | 1,500 | 1.2 | yes | 2.3 | yes |
Buy the DELTA 2 Max if…
- you want the most stored energy per dollar ($0.50 against $0.68 per Wh)
- the $1,770 difference matters more than the specs
- you carry it more than you run it (50 lb against 113.5 lb)
Buy the DELTA Pro 3 if…
- you need more continuous output (4,000 W continuous and 8,000 W surge, against 2,400 W and 4,800 W)
- you need a higher solar input ceiling (2,600 W against 1,000 W); actual recharge depends on the panels
- it will sit between the wall and a refrigerator or router (maker-stated 10 ms switchover; the other publishes none)
- you want the higher stated cycle count at the same 80% remaining capacity (4,000 against 3,000); test conditions can still differ
- you want the extra capacity (4,096 Wh against 2,048 Wh)
More EcoFlow models. Every model we list: all 116 in one table. Your own devices: the watt-hour calculator.
Questions buyers ask
Which is better for power outages, the DELTA 2 Max or the DELTA Pro 3?
EcoFlow DELTA Pro 3 states a 10 ms switchover, so it can sit between the wall and a fridge or router and take over when the power cuts, once the device is in an outlet the manual gives the backup to and any AC timeout is off (for a CPAP or a computer, check that device rides through the switch); EcoFlow DELTA 2 Max publishes no switchover figure. EcoFlow DELTA Pro 3 holds more (4,096 against 2,048). Check your appliance's startup watts against the surge figures in the table.
Which is cheaper per watt-hour?
DELTA 2 Max at $0.50 per Wh against $0.68. This compares purchase price with rated capacity, not lifetime delivered energy.
Can either run a window air conditioner?
Only if the air conditioner's running watts stay under the AC output (2,400 W on the DELTA 2 Max, 4,000 W on the DELTA Pro 3) and its start fits the surge figures in the table: read both on the air conditioner's label or in its manual, and test it before you rely on it. For the hours, multiply the rated Wh by 0.85 for inverter losses and divide by the running watts. A unit whose label says 500 W, for example, would run about 3.5 hours on the DELTA 2 Max and about 7 hours on the DELTA Pro 3 on a full charge, if its compressor ran without a break.