EcoFlow DELTA 3 Max
65BatteryRank score · Balanced
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EcoFlow DELTA 3 Max vs EcoFlow DELTA 3 Ultra
Decision readout
Better station
EcoFlow DELTA 3 Max is the better station: the overall scores are close, but it wins capacity and output, weight and noise — every dimension that separates them.
- powerEcoFlow DELTA 3 Max+7
- livabilityEcoFlow DELTA 3 Max+1220.3 kg vs 32.7 kg
EcoFlow DELTA 3 Ultra
60BatteryRank score · Balanced
What changes the decision
- Home backup: EcoFlow DELTA 3 Max — stronger combined capacity and AC-output score
- Camping & RV: EcoFlow DELTA 3 Ultra — lighter and easier to carry
01 · Score evidence
Score breakdown
65
EcoFlow DELTA 3 Max
Overall
60
EcoFlow DELTA 3 Ultra
66
POWER
EcoFlow DELTA 3 Max +7
59
Battery-side usable capacity and how much you can run at once.
67
TRUST
EcoFlow DELTA 3 Max +4
63
Owner reputation, safety record, warranty, and build durability.
55
CHARGING
EcoFlow DELTA 3 Ultra +3
58
Wall and solar recharge speed.
71
LIVABILITY
EcoFlow DELTA 3 Max +12
59
Lightweight, portable, and quiet enough to live with.
Computed from sourced data with a published, price-independent formula. Scores are relative to each model's size class.
02 · Usable energy
Capacity truth
The watt-hours on the box aren't what reaches your devices. Same scale, both units.
EcoFlow DELTA 3 Max
Rated (on the box)
2,048 Wh. Show source
claimed sourceus.ecoflow.com ↗2026-07-04The marketing number — total cell capacity.
AC delivered (est.)
1,741 Wh. Show source
estimated sourceestimate = battery-side usable capacity × 85% inverter efficiencyWhat reaches an AC outlet — about 15% is lost turning battery power into household AC. How we estimate.
EcoFlow DELTA 3 Ultra
Rated (on the box)
3,072 Wh. Show source
claimed sourceus.ecoflow.com ↗2026-07-04The marketing number — total cell capacity.
AC delivered (est.)
2,611 Wh. Show source
estimated sourceestimate = battery-side usable capacity × 85% inverter efficiencyWhat reaches an AC outlet — about 15% is lost turning battery power into household AC. How we estimate.
03 · Same assumptions
Same-device runtime
| Device | EcoFlow DELTA 3 Max | EcoFlow DELTA 3 Ultra | Assumption |
|---|---|---|---|
| CPAP (humidifier off) | about 24.2 nights | about 36.3 nights | 9 W · |
| CPAP (heated humidifier on) | about 3.9 nights | about 5.8 nights | 56 W · |
| Refrigerator (full-size) | about 28 hours | about 41 hours | 180 W × 35% duty cycle · |
| Wi-Fi router + modem | about 97 hours | about 145 hours | 18 W · |
| Laptop (65W charger) | about 54 hours | about 80 hours | 65 W × 50% duty cycle · |
| Phone (one full charge) | about 87 full charges | about 130 full charges | 20 W · |
One device at a time; estimates use each station's usable AC energy. Build your own load →
04 · Sourced hardware
Key specs, side by side
| Spec | EcoFlow DELTA 3 Max | EcoFlow DELTA 3 Ultra |
|---|---|---|
| AC-delivered capacity | 1,741 Whest.. Show sourceestimated sourceus.ecoflow.com ↗2026-07-04 | 2,611 Whest.. Show sourceestimated sourceus.ecoflow.com ↗2026-07-04 |
| Continuous power output | 2,400 W. Show sourceclaimed sourceus.ecoflow.com ↗ | 3,600 W. Show sourceclaimed sourceus.ecoflow.com ↗ |
| Surge power output | 4,800 W. Show sourceclaimed sourceus.ecoflow.com ↗ | 7,200 W. Show sourceclaimed sourceus.ecoflow.com ↗ |
| Max solar input | 500 W. Show sourceclaimed sourceus.ecoflow.com ↗ | 800 W. Show sourceclaimed sourceus.ecoflow.com ↗ |
| AC charge time (0–100%) | 68 min. Show sourceclaimed sourceus.ecoflow.com ↗ | 89 min. Show sourceclaimed sourceus.ecoflow.com ↗ |
| Weight | 20.3 kg. Show sourceclaimed sourceus.ecoflow.com ↗ | 32.7 kg. Show sourceclaimed sourceus.ecoflow.com ↗ |
| Rated cycle life | 4,000 cycles. Show sourceclaimed sourceus.ecoflow.com ↗ | 4,000 cycles. Show sourceclaimed sourceus.ecoflow.com ↗ |
Only show differences
- AC-delivered capacity1,741 Wh2,611 Wh
- Continuous power output2,400 W3,600 W
- Surge power output4,800 W7,200 W
- Max solar input500 W800 W
- AC charge time (0–100%)68 min89 min
- Weight20.3 kg32.7 kg
Manufacturer figures unless marked verified or est. Tap or focus a figure to view its source. The better reading in each row is highlighted — lower wins for weight and recharge time.
Where these rank
- EcoFlow DELTA 3 Max #7 of 10 in Best 2,000 Wh Stations · #7 of 10 in Best Power Stations for Apartment Outages
- EcoFlow DELTA 3 Ultra #3 of 7 in Best 3,000 Wh Stations · #8 of 10 in Best Power Stations for Starlink
Quick answers
- Is the EcoFlow DELTA 3 Max better than the EcoFlow DELTA 3 Ultra?
- EcoFlow DELTA 3 Max is the better station: the overall scores are close, but it wins capacity and output, weight and noise — every dimension that separates them.
- Which has more usable capacity, the EcoFlow DELTA 3 Max or EcoFlow DELTA 3 Ultra?
- The EcoFlow DELTA 3 Ultra, by 870 Wh — 1,741 Wh versus 2,611 Wh, a 50% advantage. At a 60 W load that is roughly 14.5 extra hours before the battery is empty. Both figures are estimated AC-delivered energy, not the nameplate battery rating — the watt-hours that actually reach your devices, which is always less than the number on the box.
- Which has more AC output, the EcoFlow DELTA 3 Max or EcoFlow DELTA 3 Ultra?
- The EcoFlow DELTA 3 Ultra: 2,400 W versus 3,600 W continuous. That gap matters only if a load sits between the two numbers — below 2,400 W both run it, above 3,600 W neither does. Surge headroom follows the same order: 4,800 W against 7,200 W, and surge is what decides whether a compressor or pump actually starts.
- How does runtime compare between the EcoFlow DELTA 3 Max and EcoFlow DELTA 3 Ultra?
- On the same sourced load — a refrigerator (full-size) — the EcoFlow DELTA 3 Ultra runs longer: 41.4 hours against 27.6. These are planning estimates from each model's AC-delivered capacity, not stopwatch tests; real duty cycle and temperature move them.
- Which is lighter, the EcoFlow DELTA 3 Max or EcoFlow DELTA 3 Ultra?
- The EcoFlow DELTA 3 Max, by 12.4 kg (20.3 kg versus 32.7 kg). Both weights are manufacturer figures for the bare unit; cables and a solar panel add to whatever you actually carry.
- Which recharges faster from the wall, the EcoFlow DELTA 3 Max or EcoFlow DELTA 3 Ultra?
- The EcoFlow DELTA 3 Max: 68 minutes from empty to full against 89 minutes, a difference of 21 minutes. This matters most between outages and during a short grid window — if you only ever recharge overnight, it does not matter at all.
- Which model should I buy for my use case?
- On the sub-scores that describe each use case: the EcoFlow DELTA 3 Max for home backup; the EcoFlow DELTA 3 Ultra for camping & rv. They split, so the honest answer depends on which of those you are actually buying for.
- Are the EcoFlow DELTA 3 Max and EcoFlow DELTA 3 Ultra from the same lineup?
- Yes — same manufacturer, so warranty terms, app, accessory ecosystem, and expansion batteries are usually shared. That narrows the decision to the hardware differences above rather than to which company you want to buy into.
Keep deciding
- Full scorecard, specs & price for EcoFlow DELTA 3 Max →
- Full scorecard, specs & price for EcoFlow DELTA 3 Ultra →
- See more alternatives to EcoFlow DELTA 3 Max →
- See more alternatives to EcoFlow DELTA 3 Ultra →
- What size do you need? →
- Browse all rankings →
- Check device runtime evidence →
- Compare outage and trip load plans →
- Browse complete power kits →
- Capacity vs output explained →
- Battery cycle-life thresholds →
- UPS behavior explained →