EcoFlow DELTA 3 Ultra: what it runs and for how long
The EcoFlow DELTA 3 Ultra is a 3,072 Wh LiFePO4 portable power station with a 3,600 W inverter (7,200 W surge). Compared with the EcoFlow DELTA 3 Ultra Plus, it has 800 W of solar input instead of 1,600 W and weighs 72.1 lb instead of 74.3 lb. It meets our requirements for keeping a fridge running in an outage, RVs and UPS use with computers and routers, plus 3 more uses.
What can the EcoFlow DELTA 3 Ultra run, and for how long?
Combine loads in the EcoFlow DELTA 3 Ultra runtime calculatorOn a full charge it runs a refrigerator for about 40 h and a chest freezer for about 3.4 days.
Who is the EcoFlow DELTA 3 Ultra a good fit for?
The EcoFlow DELTA 3 Ultra meets every requirement for 6 of the 12 uses we filter for.
- ✓Keeping a fridge running in an outage
- ✓RVs
- ✓UPS use with computers and routers
- ✓Fast solar charging
- ✓Running a window AC for several hours
- ✓Starting a 120 V well or sump pump
- ✕Home backup · needs expandable = yes; the EcoFlow DELTA 3 Ultra has no extra-battery support
- ✕Van life · needs weight ≤ 45 lb; the EcoFlow DELTA 3 Ultra has 72.1 lb
- ✕Carrying a CPAP on trips (light enough to pack) · needs weight ≤ 20 lb; the EcoFlow DELTA 3 Ultra has 72.1 lb
- ✕Balcony solar and apartments · needs weight ≤ 40 lb; the EcoFlow DELTA 3 Ultra has 72.1 lb
- ✕A LiFePO4 station under $500 · needs list price ≤ $500; the EcoFlow DELTA 3 Ultra has $1,599
Can you add batteries to the EcoFlow DELTA 3 Ultra?
No. EcoFlow's spec page lists the EcoFlow DELTA 3 Ultra as not expandable, so its 3,072 Wh is the most it will ever hold.
Can the EcoFlow DELTA 3 Ultra work as a UPS?
EcoFlow lists a switchover time of 10 ms for the EcoFlow DELTA 3 Ultra, inside the 20 ms gap that the ITI (CBEMA) reference says typical computer equipment should ride through.
How fast does the EcoFlow DELTA 3 Ultra recharge?
From a wall outlet it charges at up to 1,800 W; EcoFlow doesn't publish a full-charge time. From solar it needs about 5.1 hours of strong sun at its 800 W solar limit, with panels delivering 75% of their rating.
What are the EcoFlow DELTA 3 Ultra's full specifications?
These figures come from EcoFlow's official US page, checked 2026-10-12. "Not published" marks specs EcoFlow doesn't publish.
| Capacity | 3,072 Wh |
|---|---|
| Battery chemistry | LiFePO4 |
| Rated cycles | Not published EcoFlow does not state a cycle count. |
| AC output (continuous) | 3,600 W |
| AC surge | 7,200 W |
| AC outlets | 5 Spec lists 4 20A outlets plus one 30A TT-30. |
| Max USB-C output | 140 W |
| Max solar input | 800 W |
| Max AC charging input | 1,800 W |
| AC charge time (fastest mode) | Not published Reaches 80% in 1.48 hours at 1,800 W; no 0-100% AC charge time is given. |
| Expandable | No EcoFlow's comparison table lists scalability as 0, so it is not expandable. |
| Max with extra batteries | Not published |
| UPS switchover | 10 ms |
| Weight | 72.1 lb |
| Dimensions | 24.6 × 12.9 × 15.5 in |
| List price | $1,599 |
How does the EcoFlow DELTA 3 Ultra rank against other 3,000 Wh and up power stations?
Among the 14 current 3,000 Wh and up models, the EcoFlow DELTA 3 Ultra is in the top third for AC charging speed, weight, UPS switchover and Wh per list dollar and in the bottom third for solar input.
| Spec | EcoFlow DELTA 3 Ultra | Rank in band | vs band median | vs band leader |
|---|---|---|---|---|
| Capacity | 3,072 Wh | 10th of 14 | -14% | -39% vs Jackery Explorer 5000 Plus |
| AC output | 3,600 W | 5th of 14 | level | -50% vs Jackery Explorer 5000 Plus |
| Surge | 7,200 W | 5th of 14 | level | -50% vs Jackery Explorer 5000 Plus |
| Solar input | 800 W | 14th of 14 | -50% | -80% vs Jackery Explorer 5000 Plus |
| AC charging | 1,800 W | 3rd of 13 | level | -55% vs Jackery HomePower 3600 Pro Max |
| Rated cycles | Not published | — | — | — |
| Weight | 72.1 lb | 3rd of 14 | -19% | +24% vs BLUETTI Elite 300 |
| UPS switchover | 10 ms | 2nd of 12 | level | — vs Jackery Explorer 5000 Plus |
| Wh per list $ | 1.92 | 4th of 14 | +11% | -30% vs BLUETTI Elite 400 |
Who should not buy the EcoFlow DELTA 3 Ultra?
Skip the EcoFlow DELTA 3 Ultra if any of these describe you; each comes from its published specs.
- You rely on solar. Even at its full 800 W solar input it needs about 3.8 hours of strong sun to refill, slower than most models its size. The DJI Power 2000 needs about 1.1 hours at its limit.
- You may want more battery later. The EcoFlow DELTA 3 Ultra isn't listed as expandable. The EcoFlow DELTA 3 Ultra Plus (3,072 Wh) accepts extra batteries.
How long does the EcoFlow DELTA 3 Ultra last at different loads?
About 2,611 Wh reaches the AC outlets, so a steady 100 W load runs for about 26 h and a load at its full 3,600 W rating for about 44 minutes.
| Steady AC load | Runtime from full |
|---|---|
| 25 W | 4.4 days |
| 50 W | 2.2 days |
| 100 W | 26 h |
| 200 W | 13 h |
| 300 W | 8.7 h |
| 500 W | 5.2 h |
| 750 W | 3.5 h |
| 1,000 W | 2.6 h |
| 1,500 W | 1.7 h |
| 2,000 W | 1.3 h |
| 3,000 W | 52 min |
| 3,600 W | 44 min |
How many hours of sun does the EcoFlow DELTA 3 Ultra need to refill?
With panels delivering 75% of their rating (our calculator's default), the EcoFlow DELTA 3 Ultra needs the hours of strong sun below. Its 800 W solar limit caps the charge rate, so panels beyond about 1,067 W add nothing in strong sun.
| Panels | Charge rate | Sun hours to refill |
|---|---|---|
| 100 W of panels | 75 W | 41.0 h |
| 200 W of panels | 150 W | 20.5 h |
| 400 W of panels | 300 W | 10.2 h |
| 800 W of panels | 600 W | 5.1 h |
What can the EcoFlow DELTA 3 Ultra run at the same time?
The EcoFlow DELTA 3 Ultra can carry 10 of the 10 common pairs we check at once, with the runtimes below.
| Together | Runtime from full |
|---|---|
| refrigerator + wi-Fi router / modem | 30 h |
| refrigerator + chest freezer | 27 h |
| refrigerator + microwave oven | 2.4 h |
| refrigerator + electric kettle | 1.7 h |
| CPAP with heated humidifier + wi-Fi router / modem | 34 h |
| TV + wi-Fi router / modem | 19 h |
| window air conditioner + refrigerator | 3.3 h |
| sump pump + refrigerator | 3.0 h |
| space heater + wi-Fi router / modem | 1.7 h |
| microwave oven + electric kettle | 1.0 h |
Which EcoFlow DELTA 3 Ultra specs are unpublished or conditional?
EcoFlow doesn't publish these specs for the EcoFlow DELTA 3 Ultra: rated cycles.
4 published figures come with conditions, shown under the spec table: AC charge time, AC outlets, expandability and rated cycles.
How does the EcoFlow DELTA 3 Ultra compare with similar power stations?
By capacity, the nearest models from other brands are Anker SOLIX F3000, Jackery HomePower 3000 and BLUETTI Elite 300.
How is the EcoFlow DELTA 3 Ultra different from the EcoFlow DELTA 3 Ultra Plus?
The EcoFlow DELTA 3 Ultra Plus is the closest EcoFlow model. Pick the EcoFlow DELTA 3 Ultra if you want a lower list price and less weight; otherwise the EcoFlow DELTA 3 Ultra Plus gives you the opposite trade-off.
| EcoFlow DELTA 3 Ultra | EcoFlow DELTA 3 Ultra Plus | |
|---|---|---|
| Weight | 72.1 lb | 74.3 lb |
| Solar input | 800 W | 1,600 W |
| Expandable | No | Yes |
| List price | $1,599 | $2,199 |
Which models from other brands are closest in size?
Anker SOLIX F3000
Jackery HomePower 3000
BLUETTI Elite 300Which other EcoFlow models are similar?
How this page was made. Specs come from each manufacturer's official US spec page or manual, checked on the date shown; specs a manufacturer doesn't publish are marked "Not published". Runtimes are calculated (capacity × 85% inverter efficiency ÷ appliance draw), not measured. We haven't hands-on tested these units. Method and sources · Affiliate disclosure