EcoFlow DELTA 3 Classic: what it runs and for how long
The EcoFlow DELTA 3 Classic is a 1,024 Wh LiFePO4 portable power station with a 1,800 W inverter (3,600 W surge). Compared with the EcoFlow DELTA 3, it weighs 26.7 lb instead of 27.6 lb and lists for $100 less. It meets our requirements for keeping a fridge running in an outage, RVs and van life, plus 3 more uses.
What can the EcoFlow DELTA 3 Classic run, and for how long?
Combine loads in the EcoFlow DELTA 3 Classic runtime calculatorOn a full charge it runs a refrigerator for about 13 h and a chest freezer for about 27 h.
Who is the EcoFlow DELTA 3 Classic a good fit for?
The EcoFlow DELTA 3 Classic meets every requirement for 6 of the 12 uses we filter for.
- ✓Keeping a fridge running in an outage
- ✓RVs
- ✓Van life
- ✓UPS use with computers and routers
- ✓Balcony solar and apartments
- ✓Starting a 120 V well or sump pump
- ✕Camping · needs weight ≤ 25 lb; the EcoFlow DELTA 3 Classic has 26.7 lb
- ✕Carrying a CPAP on trips (light enough to pack) · needs weight ≤ 20 lb; the EcoFlow DELTA 3 Classic has 26.7 lb
- ✕Fast solar charging · needs solar input ≥ 800 W; the EcoFlow DELTA 3 Classic has 500 W
- ✕Running a window AC for several hours · needs capacity ≥ 2,000 Wh; the EcoFlow DELTA 3 Classic has 1,024 Wh
- ✕A LiFePO4 station under $500 · needs list price ≤ $500; the EcoFlow DELTA 3 Classic has $599
Can you add batteries to the EcoFlow DELTA 3 Classic?
No. EcoFlow's spec page lists the EcoFlow DELTA 3 Classic as not expandable, so its 1,024 Wh is the most it will ever hold.
Can the EcoFlow DELTA 3 Classic work as a UPS?
EcoFlow lists a switchover time of 10 ms for the EcoFlow DELTA 3 Classic, inside the 20 ms gap that the ITI (CBEMA) reference says typical computer equipment should ride through.
How fast does the EcoFlow DELTA 3 Classic recharge?
From a wall outlet it recharges in about 60 minutes in its fastest mode, per EcoFlow. From solar it needs about 2.7 hours of strong sun at its 500 W solar limit, with panels delivering 75% of their rating.
What are the EcoFlow DELTA 3 Classic'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 | 1,024 Wh |
|---|---|
| Battery chemistry | LiFePO4 |
| Rated cycles | Not published EcoFlow does not state a cycle count. |
| AC output (continuous) | 1,800 W X-Boost mode is listed at 2,600 W. |
| AC surge | 3,600 W EcoFlow does not state a surge rating. |
| AC outlets | Not published EcoFlow does not state the AC outlet count; its comparison lists 6 total outlets including USB. |
| Max USB-C output | 100 W |
| Max solar input | 500 W |
| Max AC charging input | 1,400 W |
| AC charge time (fastest mode) | 60 min AC charging takes 45 minutes to 80% and 60 minutes to 100%. |
| Expandable | No EcoFlow states no expandable battery option. |
| Max with extra batteries | Not published |
| UPS switchover | 10 ms |
| Weight | 26.7 lb |
| Dimensions | 15.7 × 7.9 × 11.1 in |
| List price | $599 |
How does the EcoFlow DELTA 3 Classic rank against other 1,000–1,999 Wh power stations?
Among the 17 current 1,000–1,999 Wh models, the EcoFlow DELTA 3 Classic is in the top third for surge and UPS switchover.
| Spec | EcoFlow DELTA 3 Classic | Rank in band | vs band median | vs band leader |
|---|---|---|---|---|
| Capacity | 1,024 Wh | 8th of 17 | level | -33% vs Jackery Explorer 1500 v2 |
| AC output | 1,800 W | 6th of 17 | level | -18% vs DJI Power 1000 |
| Surge | 3,600 W | 4th of 16 | level | -18% vs DJI Power 1000 |
| Solar input | 500 W | 8th of 15 | level | -50% vs EcoFlow DELTA 3 Plus |
| AC charging | 1,400 W | 9th of 16 | -1% | -20% vs Jackery Explorer 1500 v2 |
| Rated cycles | Not published | — | — | — |
| Weight | 26.7 lb | 8th of 17 | -3% | +14% vs Jackery HomePower 1000 v2 |
| UPS switchover | 10 ms | 1st of 15 | level | leads the band |
| Wh per list $ | 1.71 | 7th of 16 | +3% | -27% vs BLUETTI Elite 100 mini |
Who should not buy the EcoFlow DELTA 3 Classic?
Skip the EcoFlow DELTA 3 Classic if any of these describe you; each comes from its published specs.
- You may want more battery later. The EcoFlow DELTA 3 Classic isn't listed as expandable. The EcoFlow DELTA 3 Plus (1,024 Wh) accepts extra batteries.
How long does the EcoFlow DELTA 3 Classic last at different loads?
About 870 Wh reaches the AC outlets, so a steady 100 W load runs for about 8.7 h and a load at its full 1,800 W rating for about 29 minutes.
| Steady AC load | Runtime from full |
|---|---|
| 25 W | 35 h |
| 50 W | 17 h |
| 100 W | 8.7 h |
| 200 W | 4.4 h |
| 300 W | 2.9 h |
| 500 W | 1.7 h |
| 750 W | 1.2 h |
| 1,000 W | 52 min |
| 1,500 W | 35 min |
| 1,800 W | 29 min |
How many hours of sun does the EcoFlow DELTA 3 Classic need to refill?
With panels delivering 75% of their rating (our calculator's default), the EcoFlow DELTA 3 Classic needs the hours of strong sun below. Its 500 W solar limit caps the charge rate, so panels beyond about 667 W add nothing in strong sun.
| Panels | Charge rate | Sun hours to refill |
|---|---|---|
| 100 W of panels | 75 W | 13.7 h |
| 200 W of panels | 150 W | 6.8 h |
| 400 W of panels | 300 W | 3.4 h |
| 800 W of panels | 500 W | 2.0 h |
What can the EcoFlow DELTA 3 Classic run at the same time?
The EcoFlow DELTA 3 Classic can carry 8 of the 10 common pairs we check at once, with the runtimes below. It can't carry refrigerator + electric kettle and microwave oven + electric kettle: together they pass its running or start-up limit.
| Together | Runtime from full |
|---|---|
| refrigerator + wi-Fi router / modem | 10 h |
| refrigerator + chest freezer | 8.9 h |
| refrigerator + microwave oven | 0.8 h |
| CPAP with heated humidifier + wi-Fi router / modem | 11 h |
| TV + wi-Fi router / modem | 6.2 h |
| window air conditioner + refrigerator | 1.1 h |
| sump pump + refrigerator | 1.0 h |
| space heater + wi-Fi router / modem | 0.6 h |
Which EcoFlow DELTA 3 Classic specs are unpublished or conditional?
EcoFlow doesn't publish these specs for the EcoFlow DELTA 3 Classic: rated cycles.
6 published figures come with conditions, shown under the spec table: AC charge time, AC outlets, AC output, expandability, rated cycles and surge.
How does the EcoFlow DELTA 3 Classic compare with similar power stations?
By capacity, the nearest models from other brands are Anker SOLIX C1000 Gen 2, DJI Power 1000 and Jackery HomePower 1000 v2.
How is the EcoFlow DELTA 3 Classic different from the EcoFlow DELTA 3?
The EcoFlow DELTA 3 is the closest EcoFlow model. Pick the EcoFlow DELTA 3 Classic if you want a lower list price and less weight; otherwise the EcoFlow DELTA 3 gives you the opposite trade-off.
| EcoFlow DELTA 3 Classic | EcoFlow DELTA 3 | |
|---|---|---|
| Weight | 26.7 lb | 27.6 lb |
| Rated cycles | Not published | 4,000 |
| Expandable | No | Yes |
| List price | $599 | $699 |
Which models from other brands are closest in size?
Anker SOLIX C1000 Gen 2
DJI Power 1000
Jackery HomePower 1000 v2Which 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