EcoFlow DELTA Pro 3
The DELTA Pro 3 holds 4,096 Wh behind 4,000 W of continuous AC output. It scores 8.8 out of 10 against the rest of this catalogue, ranking 1 of 2 in its size class. On the numbers, it refills quickly for its size. No published figure stands out as a weakness.
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Our score
Ranked 1 of 2 among units above 3,000 Wh
Scores are calculated from published specifications, not opinion. How the score is built
The full specification
Every figure below is read from the maker's own specification page. Where a value is missing, it is missing because EcoFlow does not publish it, not because it was too much trouble to find.
| Capacity | 4,096 Wh |
|---|---|
| AC output | 4,000 W |
| Surge | 8,000 W |
| Cell chemistry | LFP |
| Cycle life | 4,000 cycles to 80% |
| Wall recharge | 50 minutes |
| Max solar input | 2,600 W |
| UPS switchover | 10 ms |
| Weight | 113.5 lb (51.5 kg) |
| Extra batteries | Expandable to 12,000 Wh |
Where it is strong, and where it is not
- Recharge speed. On this axis it refills quickly for its size.
- Capacity. On this axis it holds more energy than most of the range.
- Backup switchover. On this axis it switches over fast enough to carry a computer through a cut.
What it will actually run
These estimates use the same arithmetic as the run time calculator: usable watt hours after an assumed 85% inverter efficiency, divided by the appliance's average draw rather than its peak. The fridge figure assumes the compressor runs about a third of the time, which is what makes it plausible.
| Appliance | Typical draw | Estimated run time |
|---|---|---|
| Fridge | 120 W | 82 h 54 min |
| CPAP machine | 45 W | 77 h 22 min |
| Router and modem | 15 W | 232 h 6 min |
| Television | 90 W | 38 h 41 min |
| Microwave | 1200 W | 2 h 54 min |
Read the rating plate on your own appliance before trusting any of these. The wattages above are common starting points, not measurements of your kit.
The closest alternatives
The units nearest this one in capacity, with their own scores. Capacity is the honest axis to shortlist on: two units of the same size are genuinely substitutable, and everything else is a trade.
| # | Brand | Model | Score | Capacity | AC output | Weight | Actions |
|---|---|---|---|---|---|---|---|
| 1 |  | BLUETTI Apex 300 | 8.4/10 | 2,764.8 Wh | 3,840 W | 83.8 lb (38.0 kg) | Check price |
| 2 |  | Anker SOLIX F3800 | 8.1/10 | 3,840 Wh | 6,000 W | 132.3 lb (60.0 kg) | Check price |
| 3 | | BLUETTI Elite 200 V2 | 7.7/10 | 2,073.6 Wh | 2,600 W | 53.4 lb (24.2 kg) | Check price |
Common questions
How long will the DELTA Pro 3 run a fridge?
See the table above. The figure assumes an average domestic fridge and a compressor running about a third of the time. A warm room, a full shelf of fresh shopping or a door that keeps opening all push the real duty cycle up and the run time down.
Can I add capacity later?
Yes, this model accepts an expansion battery. That matters more than it looks: most people underestimate the size they need, and an expandable unit turns that mistake into an accessory purchase rather than a replacement.
What does the cycle rating promise?
That after 4,000 cycles to 80%, the pack still holds the stated share of its original capacity. It is a degradation threshold, not a failure point. Always note the endpoint when comparing against another maker: they do not all quote the same one.