Bluetti AC70
71BatteryRank score · Excellent
$359as of
Fair price← CompareCheck price on Amazon 
Check price on Amazon
Bluetti AC70 vs EcoFlow DELTA 2
Decision readout
Better station
Bluetti AC70 leads by 14 points overall.
Better buy today
No purchase urgency: the performance leader is not at a Good or Great price today.
EcoFlow DELTA 2
57BatteryRank score · Balanced
$469as of
Fair priceWhat changes the decision
- Home backup: Bluetti AC70 — stronger combined capacity and AC-output score
- CPAP & bedroom: EcoFlow DELTA 2 — quieter under load
- Camping & RV: EcoFlow DELTA 2 — lighter and easier to carry
01 · Score evidence
Score breakdown
71
Bluetti AC70
Overall
57
EcoFlow DELTA 2
75
POWER
Bluetti AC70 +23
52
Battery-side usable capacity and how much you can run at once.
74
TRUST
Bluetti AC70 +6
68
Owner reputation, safety record, warranty, and build durability.
60
CHARGING
Bluetti AC70 +28
32
Wall and solar recharge speed.
63
LIVABILITY
EcoFlow DELTA 2 +16
79
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.
Bluetti AC70
Rated (on the box)
768 Wh. Show source
claimed sourcebluettipower.com ↗2026-07-04The marketing number — total cell capacity.
AC delivered (est.)
653 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 2
Rated (on the box)
1,024 Wh. Show source
claimed sourceecoflow-service-us-prod.oss-us-west-1.aliyuncs.com ↗2026-07-10The marketing number — total cell capacity.
AC deliveredmeasured
890–900 Wh. Show source
verified source~890-900Wh usable AC (~86-90% conversion) vs 1024Wh rated (Portable Power Lab, 6-month test)2026-07-04~890-900Wh usable AC (~86-90% conversion) vs 1024Wh rated (Portable Power Lab, 6-month test) · 13% below the label
03 · Same assumptions
Same-device runtime
| Device | Bluetti AC70 | EcoFlow DELTA 2 | Assumption |
|---|---|---|---|
| CPAP (humidifier off) | about 9.1 nights | about 12.4 nights | 9 W · |
| CPAP (heated humidifier on) | about 1.5 nights | about 2.0 nights | 56 W · |
| Refrigerator (full-size) | about 10 hours | about 14 hours | 180 W × 35% duty cycle · |
| Wi-Fi router + modem | about 36 hours | about 50 hours | 18 W · |
| Laptop (65W charger) | about 20 hours | about 28 hours | 65 W × 50% duty cycle · |
| Phone (one full charge) | about 32 full charges | about 44 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 | Bluetti AC70 | EcoFlow DELTA 2 |
|---|---|---|
| AC-delivered capacity | 653 Whest.. Show sourceestimated sourcebluettipower.com ↗2026-07-04 | 895 Whverified. Show sourceverified source~890-900Wh usable AC (~86-90% conversion) vs 1024Wh rated (Portable Power Lab, 6-month test)2026-07-04 |
| Continuous power output | 1,000 W. Show sourceclaimed sourcebluettipower.com ↗ | 1,800 W. Show sourceclaimed sourceecoflow-service-us-prod.oss-us-west-1.aliyuncs.com ↗ |
| Surge power output | 2,000 W. Show sourceclaimed sourcebluettipower.com ↗ | 2,700 W. Show sourceclaimed sourceecoflow-service-us-prod.oss-us-west-1.aliyuncs.com ↗ |
| Max solar input | 500 W. Show sourceclaimed sourcebluettipower.com ↗ | 500 W. Show sourceclaimed sourceecoflow-service-us-prod.oss-us-west-1.aliyuncs.com ↗ |
| AC charge time (0–100%) | 75 min. Show sourceclaimed sourcebluettipower.com ↗ | 72 min. Show sourceclaimed sourceecoflow-service-us-prod.oss-us-west-1.aliyuncs.com ↗ |
| Weight | 10.2 kg. Show sourceclaimed sourcebluettipower.com ↗ | 12 kg. Show sourceclaimed sourceecoflow-service-us-prod.oss-us-west-1.aliyuncs.com ↗ |
| Rated cycle life | 3,000 cycles. Show sourceclaimed sourcebluettipower.com ↗ | 3,000 cycles. Show sourceclaimed sourceecoflow-service-us-prod.oss-us-west-1.aliyuncs.com ↗ |
Only show differences
- AC-delivered capacity653 Wh895 Wh
- Continuous power output1,000 W1,800 W
- Surge power output2,000 W2,700 W
- AC charge time (0–100%)75 min72 min
- Weight10.2 kg12 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 2
$469as of Fair price
Each verdict compares today's price against that model's own tracked history — never MSRP theater.
Where these rank
Quick answers
- Is the Bluetti AC70 better than the EcoFlow DELTA 2?
- Bluetti AC70 leads by 14 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 Bluetti AC70 or EcoFlow DELTA 2?
- 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 Bluetti AC70 or EcoFlow DELTA 2?
- 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 Bluetti AC70 or EcoFlow DELTA 2?
- 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 Bluetti AC70 or EcoFlow DELTA 2?
- 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 Bluetti AC70 and EcoFlow DELTA 2?
- 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 Bluetti AC70 →
- Full scorecard, specs & price for EcoFlow DELTA 2 →
- See more alternatives to Bluetti AC70 →
- See more alternatives to EcoFlow DELTA 2 →
- 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 →