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EcoFlow DELTA Pro 3 (UL9540 Certificated) Review
4,000W continuous output, LiFePO4 cells. Listed at $2,799 at EcoFlow.
The EcoFlow DELTA Pro 3 (UL9540 Certificated) is a portable 600 1,200wh unit. It uses LiFePO4 cells rated for 4,000 cycles, so it is built to be kept rather than replaced. It lists at $2,799 against an $5,699 MSRP.
Price and stock are shown on Amazon. We may earn a commission, which never changes what the figures say.
EcoFlow DELTA Pro 3 (UL9540 Certificated) specifications
Manufacturer figures, gathered so you can read them against everything else we track rather than against the marketing page they came from.
| Continuous AC output | 4,000W |
| Cell chemistry | LiFePO4 |
| Rated cycle life | 4,000 cycles |
| Price at EcoFlow | $2,799 |
What the EcoFlow DELTA Pro 3 (UL9540 Certificated) inverter will carry
EcoFlow does not publish a watt-hour capacity for this model, so we cannot give you runtimes and we will not estimate them. What is published is the 4,000W continuous rating, and that alone settles which appliances are on the table.
| Appliance | Typical draw | Within 4,000W? |
|---|---|---|
| Phones, tablets, laptops | 100W | Yes |
| Wi-Fi router and modem | 30W | Yes |
| Full-size refrigerator | 150W | Yes |
| CPAP with humidifier | 90W | Yes |
| Television and console | 200W | Yes |
| Microwave | 1,000W | Yes |
| Coffee maker | 900W | Yes |
| Space heater | 1,500W | Yes |
| Window air conditioner | 1,200W | Yes |
| Table saw or circular saw | 1,800W | Yes |
Carrying a load and carrying it for a useful length of time are different questions, and the second one needs the capacity figure that is missing here. Treat this table as the shortlist of what the unit can power at all, not as a statement about endurance.
How the EcoFlow DELTA Pro 3 (UL9540 Certificated) compares
The closest units we track from other manufacturers in the same band, matched on capacity rather than on price.
| EcoFlow DELTA Pro 3 (UL9540 Certificated) | BLUETTI Apex 300 Versatile | Jackery Explorer 1500 Ultra | |
|---|---|---|---|
| Capacity | — | 2,765Wh | 1,536Wh |
| Output | 4,000W | 3,840W | 3,600W |
| Cycle life | 4,000 cycles | 6,000 cycles | 4,000 cycles |
| Weight | — | 84 lb | 39 lb |
| Price | $2,799 | $1,899 | $1,199 |
| Cost per watt-hour | — | $0.69 | $0.78 |
Where the EcoFlow DELTA Pro 3 (UL9540 Certificated) sits in its band
We track 83 priced units in the portable 600 1,200wh band, running from $119 to $9,199. At $2,799 the EcoFlow DELTA Pro 3 (UL9540 Certificated) is the 79 cheapest of 83. Because EcoFlow does not publish a capacity for this model, we cannot rank it on cost per watt-hour, which is the measure we would normally lead with. Price position on its own tells you where it sits in the range but not whether it is good value, and those are genuinely different questions.
Alternatives to the EcoFlow DELTA Pro 3 (UL9540 Certificated)
Units we track in the same band that are close enough to be genuine substitutes, matched on continuous output. Each links to its own review.
- BLUETTI Apex 300 Versatile review — 2,765Wh, 3,840W output, listed at $1,899, $0.69 per watt-hour.
- Jackery Explorer 3000 Pro review — listed at $2,499.
- Jackery Explorer 1500 Ultra review — 1,536Wh, 3,600W output, listed at $1,199, $0.78 per watt-hour.
- Jackery 1500 Ultra review — 3,600W output, listed at $1,419.
Who the EcoFlow DELTA Pro 3 (UL9540 Certificated) suits
The 4,000W continuous rating puts a hard boundary on what this unit can power at all, and that boundary is the part of the decision we can speak to with confidence.
What we cannot tell you is how long it will hold out, because EcoFlow has not published a watt-hour figure for this model. If runtime is the question you are actually asking, either get that number from EcoFlow before ordering or choose one of the alternatives below, where the figure is on record and the arithmetic can be checked.
EcoFlow DELTA Pro 3 (UL9540 Certificated) questions
Can the EcoFlow DELTA Pro 3 (UL9540 Certificated) be charged by solar?
EcoFlow does not publish a maximum solar input for this model. Rather than estimate one, we leave it out. Check the manual that ships with the unit before buying panels for it.
What is not published
EcoFlow does not state the watt-hour capacity, which is the single figure runtime depends on, the weight, the maximum solar input, the warranty term for this model. We list figures rather than estimate them, so those rows stay empty until the manufacturer publishes them. If you need one of them to make the decision, ask EcoFlow directly and hold them to the answer.
How we assess these
Every figure on this page comes from the manufacturer, and every derived number, cost per watt-hour and estimated runtime, is calculated the same way for all 437 products we track. That is what makes the comparison meaningful: we are not scoring units against a private impression of them, we are putting published figures side by side and doing the arithmetic in public. Where a manufacturer stays quiet, we say so rather than filling the gap.