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EcoFlow DELTA Pro Ultra Whole-Home Backup Power (UL 9540 Certificated) Review
6,000Wh of storage. Listed at $3,799 at EcoFlow.
The EcoFlow DELTA Pro Ultra Whole-Home Backup Power (UL 9540 Certificated) is a home backup systems unit holding 6,000Wh. At $0.63 per watt-hour it is priced above the median for the band, so you are paying a premium over comparable capacity. It lists at $3,799 against an $7,599 MSRP.
Price and stock are shown on Amazon. We may earn a commission, which never changes what the figures say.
Computed from this unit’s published specification, not from a manufacturer claim. Method and the full catalogue comparison are in our power station price index.
What the EcoFlow DELTA Pro Ultra Whole-Home Backup Power (UL 9540 Certificated) will run, and for how long
Runtimes below are calculated from the 6,000Wh rated capacity, derated to 85% for AC loads and 92% for USB and 12V loads to cover inverter and conversion losses. They are arithmetic, not lab measurements, but they are the same arithmetic applied to every unit we track, so the comparison holds.
| Load | Estimated runtime |
|---|---|
| Phone charge (12Wh) | 460 charges |
| Wi-Fi router (10W) | 510 hr |
| LED work light (10W) | 552 hr |
| CPAP, humidifier off (40W) | 128 hr |
| Laptop (60W) | 85 hr |
| 12V portable fridge (45W avg) | 113 hr |
| 55-inch TV (90W) | 57 hr |
Real figures land below these. A fridge cycles rather than drawing continuously, and cold weather costs a lithium pack usable capacity, so treat the table as the ceiling rather than the expectation.
EcoFlow DELTA Pro Ultra Whole-Home Backup Power (UL 9540 Certificated) specifications
Manufacturer figures, gathered so you can read them against everything else we track rather than against the marketing page they came from.
| Capacity | 6,000Wh |
| Price at EcoFlow | $3,799 |
| Cost per watt-hour | $0.63 |
How the EcoFlow DELTA Pro Ultra Whole-Home Backup Power (UL 9540 Certificated) compares
The closest units we track from other manufacturers in the same band, matched on capacity rather than on price.
| EcoFlow DELTA Pro Ultra Whole-Home Backup Power (UL 9540 Certificated) | Goal Zero Yeti 6000X | OUPES Mega 5 Home Backup & | |
|---|---|---|---|
| Capacity | 6,000Wh | 6,071Wh | 5,040Wh |
| Output | — | 2,000W | 4,000W |
| Cycle life | — | 500 cycles | 3,500 cycles |
| Weight | — | 106 lb | — |
| Price | $3,799 | $3,999.95 | $3,499 |
| Cost per watt-hour | $0.63 | $0.66 | $0.69 |
Where the EcoFlow DELTA Pro Ultra Whole-Home Backup Power (UL 9540 Certificated) sits in its band
We track 21 units in the home backup systems band with both a price and a published capacity. They run from $489 to $10,999, and from 1,024Wh to 20,000Wh. On cost per watt-hour the EcoFlow DELTA Pro Ultra Whole-Home Backup Power (UL 9540 Certificated) ranks 15 of 21, where 1 is the cheapest capacity in the band. That puts it in the most expensive third, so it has to earn the difference somewhere other than raw capacity. Ranking on cost per watt-hour deliberately ignores build quality, port selection and warranty, so read it as one input rather than as the answer.
Alternatives to the EcoFlow DELTA Pro Ultra Whole-Home Backup Power (UL 9540 Certificated)
Units we track in the same band that are close enough to be genuine substitutes, matched on capacity. Each links to its own review.
- Goal Zero Yeti 6000X review — 6,071Wh, 2,000W output, listed at $3,999.95, $0.66 per watt-hour, dearer capacity than the EcoFlow DELTA Pro Ultra Whole-Home Backup Power (UL 9540 Certificated).
- OUPES Mega 5 Home Backup & review — 5,040Wh, 4,000W output, listed at $3,499, $0.69 per watt-hour, dearer capacity than the EcoFlow DELTA Pro Ultra Whole-Home Backup Power (UL 9540 Certificated).
- OUPES Titan 5 Home Backup & review — 5,040Wh, 4,000W output, listed at $3,299, $0.65 per watt-hour, dearer capacity than the EcoFlow DELTA Pro Ultra Whole-Home Backup Power (UL 9540 Certificated).
- OUPES B2 Extra Home Backup Battery For Mega 2 review — 4,096Wh, 2,500W output, listed at $1,329, $0.32 per watt-hour, cheaper capacity than the EcoFlow DELTA Pro Ultra Whole-Home Backup Power (UL 9540 Certificated).
Who the EcoFlow DELTA Pro Ultra Whole-Home Backup Power (UL 9540 Certificated) suits
It is a sensible buy for whole-circuit backup, extended off-grid stays, and running heavy appliances without rationing them. It is the wrong tool for anyone who needs something genuinely portable, since capacity at this level comes with real weight.
EcoFlow DELTA Pro Ultra Whole-Home Backup Power (UL 9540 Certificated) questions
How long will the EcoFlow DELTA Pro Ultra Whole-Home Backup Power (UL 9540 Certificated) run a fridge?
A full-size fridge averages about 50W once you account for the compressor cycling on and off. From 6,000Wh, derated to 85% for inverter losses, that is roughly 102 hr on a full charge. A 12V portable fridge draws less and will run considerably longer.
Can the EcoFlow DELTA Pro Ultra Whole-Home Backup Power (UL 9540 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.
Is the EcoFlow DELTA Pro Ultra Whole-Home Backup Power (UL 9540 Certificated) worth it?
At $3,799 it works out at $0.63 per watt-hour. It costs more per watt-hour than the median unit in its band, so the case for it rests on the features rather than on the price. Read the comparison table above against the two closest rivals before deciding.
What is not published
EcoFlow does not state the rated cycle life, the weight, the maximum solar input, the continuous AC output, 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.