EcoFlow DELTA 3 Max
66BatteryRank score · Balanced
$1,199as of
High price← CompareCheck price on Amazon 
Check price on Amazon
EcoFlow DELTA 3 Max vs EcoFlow DELTA Pro 3
Decision readout
Better station
EcoFlow DELTA Pro 3 leads by 9 points overall.
Better buy today
No purchase urgency: the performance leader is not at a Good or Great price today.
EcoFlow DELTA Pro 3
75BatteryRank score · Excellent
$2,399as of
Fair priceWhat changes the decision
- Home backup: EcoFlow DELTA Pro 3 — more AC-delivered capacity and higher AC output
- Camping & RV: EcoFlow DELTA 3 Max — lighter and easier to carry
01 · Score evidence
Score breakdown
66
EcoFlow DELTA 3 Max
Overall
75
EcoFlow DELTA Pro 3
67
POWER
EcoFlow DELTA Pro 3 +16
83
Battery-side usable capacity and how much you can run at once.
68
TRUST
EcoFlow DELTA Pro 3 +5
73
Owner reputation, safety record, warranty, and build durability.
52
CHARGING
Incomplete data
N/A
Wall and solar recharge speed.
74
LIVABILITY
EcoFlow DELTA 3 Max +32
42
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 Pro 3
Rated (on the box)
4,096 Wh. Show source
claimed sourceus.ecoflow.com ↗2026-07-04The marketing number — total cell capacity.
AC deliveredmeasured
3,790 Wh. Show source
verified source3790Wh usable at >93% efficiency (OutdoorGearLab) vs 4096 rated2026-07-043790Wh usable at >93% efficiency (OutdoorGearLab) vs 4096 rated · 7% below the label
03 · Same assumptions
Same-device runtime
| Device | EcoFlow DELTA 3 Max | EcoFlow DELTA Pro 3 | Assumption |
|---|---|---|---|
| CPAP (humidifier off) | about 24.2 nights | about 52.6 nights | 9 W · |
| CPAP (heated humidifier on) | about 3.9 nights | about 8.5 nights | 56 W · |
| Refrigerator (full-size) | about 28 hours | about 60 hours | 180 W × 35% duty cycle · |
| Wi-Fi router + modem | about 97 hours | about 211 hours | 18 W · |
| Laptop (65W charger) | about 54 hours | about 117 hours | 65 W × 50% duty cycle · |
| Phone (one full charge) | about 87 full charges | about 189 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 Pro 3 |
|---|---|---|
| AC-delivered capacity | 1,741 Whest.. Show sourceestimated sourceus.ecoflow.com ↗2026-07-04 | 3,790 Whverified. Show sourceverified source3790Wh usable at >93% efficiency (OutdoorGearLab) vs 4096 rated2026-07-04 |
| Continuous power output | 2,400 W. Show sourceclaimed sourceus.ecoflow.com ↗ | 4,000 W. Show sourceclaimed sourceus.ecoflow.com ↗ |
| Surge power output | 4,800 W. Show sourceclaimed sourceus.ecoflow.com ↗ | 8,000 W. Show sourceclaimed sourceus.ecoflow.com ↗ |
| Max solar input | 500 W. Show sourceclaimed sourceus.ecoflow.com ↗ | 2,600 W. Show sourceclaimed sourceus.ecoflow.com ↗ |
| AC charge time (0–100%) | 68 min. Show sourceclaimed sourceus.ecoflow.com ↗ | — |
| Weight | 20.3 kg. Show sourceclaimed sourceus.ecoflow.com ↗ | 51.5 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 Wh3,790 Wh
- Continuous power output2,400 W4,000 W
- Surge power output4,800 W8,000 W
- Max solar input500 W2,600 W
- AC charge time (0–100%)68 min—
- Weight20.3 kg51.5 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.
05 · Tracked street price
Price & fair-price verdict
EcoFlow DELTA 3 Max
$1,199as of High price
Each verdict compares today's price against that model's own tracked history — never MSRP theater.
Where these rank
- EcoFlow DELTA 3 Max #6 of 10 in Best for RV & Van Life · #9 of 10 in Best for CPAP
- EcoFlow DELTA Pro 3 #2 XL / home backup in Best Portable Power Stations · #2 of 10 in Best for RV & Van Life
Quick answers
- Is the EcoFlow DELTA 3 Max better than the EcoFlow DELTA Pro 3?
- EcoFlow DELTA Pro 3 leads by 9 points overall. No purchase urgency: the performance leader is not at a Good or Great price today.
- How are these two power stations compared?
- Both are scored by the BatteryRank formula across four pillars — power, trust, charging, and livability — over sourced specs, owner reputation, and durability. Capacity scoring uses battery-side usable watt-hours; this page separately shows estimated or measured AC-delivered capacity. Price is shown against each model's own history, and the score is price-independent.
- Which has more usable capacity, the EcoFlow DELTA 3 Max or EcoFlow DELTA Pro 3?
- Use the capacity-truth section for the model-specific comparison. It separates rated battery energy from estimated or independently measured AC-delivered energy, so nameplate watt-hours are not mistaken for outlet runtime.
- Which has more AC output, the EcoFlow DELTA 3 Max or EcoFlow DELTA Pro 3?
- The key-differences table compares continuous inverter output and surge output when both sourced readings exist. A missing input stays N/A and never creates a winner.
- Which is lighter, the EcoFlow DELTA 3 Max or EcoFlow DELTA Pro 3?
- The key-differences table marks the lighter station only when both manufacturer-sourced weight readings are present. Open each model dossier for dimensions and the full portability context.
- Which is the better price today, the EcoFlow DELTA 3 Max or EcoFlow DELTA Pro 3?
- The decision dashboard evaluates each timestamped street price against that model's own tracked history. Price is separate from the quality score, and no deal claim appears without sufficient history.
- How does runtime compare between the EcoFlow DELTA 3 Max and EcoFlow DELTA Pro 3?
- The runtime table uses the same sourced device loads and each model's AC-delivered capacity. Results are planning estimates, not hands-on tests, and appear only when both models have enough data.
- Which model should I buy for my use case?
- Use the persona-fit section as a starting point, then confirm required output, runtime, charging, portability, and today's price. BatteryRank declares a use-case winner only when both sides have the needed inputs.
Keep deciding
- Full scorecard, specs & price for EcoFlow DELTA 3 Max →
- Full scorecard, specs & price for EcoFlow DELTA Pro 3 →
- See more alternatives to EcoFlow DELTA 3 Max →
- See more alternatives to EcoFlow DELTA Pro 3 →
- What size do you need? →
- Browse all rankings →
- Capacity vs output explained →
- Battery cycle-life thresholds →
- UPS behavior explained →