Bluetti AC50B
40BatteryRank score · Limited
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Bluetti AC50B vs EcoFlow RIVER 2 Pro (700)
Decision readout
Better station
EcoFlow RIVER 2 Pro (700) leads by 20 points overall.
EcoFlow RIVER 2 Pro (700)
60BatteryRank score · Balanced
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What changes the decision
By the BatteryRank Engineering Team
01 · Score evidence
Score breakdown
40
Bluetti AC50B
Overall
60
EcoFlow RIVER 2 Pro (700)
21
POWER
EcoFlow RIVER 2 Pro (700) +34
55
Battery-side usable capacity and how much you can run at once.
64
TRUST
Tied
64
Owner reputation, safety record, warranty, and build durability.
58
CHARGING
EcoFlow RIVER 2 Pro (700) +16
74
Wall and solar recharge speed.
50
LIVABILITY
Tied
50
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 AC50B
Rated (on the box)
448 Wh. Show source
claimed sourcesupport.bluettipower.com2026-07-27https://support.bluettipower.com/en-us/products/ac50bThe marketing number — total cell capacity.
AC delivered (est.)
381 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 RIVER 2 Pro (700)
Rated (on the box)
716 Wh. Show source
claimed sourceus.ecoflow.com2026-07-27https://us.ecoflow.com/collections/river-2-pro-series/products/river-2-pro-700-portable-power-stationThe marketing number — total cell capacity.
AC delivered (est.)
609 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 | Bluetti AC50B | EcoFlow RIVER 2 Pro (700) | Assumption |
|---|---|---|---|
| CPAP (humidifier off) | about 5.3 nights | about 8.5 nights | 9 W · |
| CPAP (heated humidifier on) | about 0.9 nights | about 1.4 nights | 56 W · |
| Refrigerator (full-size) | about 6.0 hours | about 9.7 hours | 180 W × 35% duty cycle · |
| Wi-Fi router + modem | about 21 hours | about 34 hours | 18 W · |
| Laptop (65W charger) | about 12 hours | about 19 hours | 65 W × 50% duty cycle · |
| Phone (one full charge) | about 19 full charges | about 30 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 AC50B | EcoFlow RIVER 2 Pro (700) |
|---|---|---|
| AC-delivered capacity | 381 Whest.. Show sourceestimated sourcesupport.bluettipower.com2026-07-27https://support.bluettipower.com/en-us/products/ac50b | 609 Whest.. Show sourceestimated sourceus.ecoflow.com2026-07-27https://us.ecoflow.com/collections/river-2-pro-series/products/river-2-pro-700-portable-power-station |
| Continuous power output | 700 W. Show sourceclaimed sourcesupport.bluettipower.com2026-07-27https://support.bluettipower.com/en-us/products/ac50b | 800 W. Show sourceclaimed sourceus.ecoflow.com2026-07-27https://us.ecoflow.com/collections/river-2-pro-series/products/river-2-pro-700-portable-power-station |
| Surge power output | — | 1,600 W. Show sourceclaimed sourceus.ecoflow.com2026-07-27https://us.ecoflow.com/collections/river-2-pro-series/products/river-2-pro-700-portable-power-station |
| Max solar input | 200 W. Show sourceclaimed sourcesupport.bluettipower.com2026-07-27https://support.bluettipower.com/en-us/products/ac50b | 220 W. Show sourceclaimed sourceus.ecoflow.com2026-07-27https://us.ecoflow.com/collections/river-2-pro-series/products/river-2-pro-700-portable-power-station |
| Weight | 6.7 kg. Show sourceclaimed sourcesupport.bluettipower.com2026-07-27https://support.bluettipower.com/en-us/products/ac50b | 7.8 kg. Show sourceclaimed sourceus.ecoflow.com2026-07-27https://us.ecoflow.com/collections/river-2-pro-series/products/river-2-pro-700-portable-power-station |
| Rated cycle life | 3,000 cycles. Show sourceclaimed sourcesupport.bluettipower.com2026-07-27https://support.bluettipower.com/en-us/products/ac50b | 3,000 cycles. Show sourceclaimed sourceus.ecoflow.com2026-07-27https://us.ecoflow.com/collections/river-2-pro-series/products/river-2-pro-700-portable-power-station |
Only show differences
- AC-delivered capacity381 Wh609 Wh
- Continuous power output700 W800 W
- Surge power output—1,600 W
- Max solar input200 W220 W
- Weight6.7 kg7.8 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
- Bluetti AC50B #4 of 4 in Best 500 Wh Stations · #9 of 10 in Fastest AC-Charging Power Stations
- EcoFlow RIVER 2 Pro (700) #6 of 10 in Best for Camping · #8 of 10 in Fastest AC-Charging Power Stations
Quick answers
- Is the Bluetti AC50B better than the EcoFlow RIVER 2 Pro (700)?
- EcoFlow RIVER 2 Pro (700) leads by 20 points overall.
- Which has more usable capacity, the Bluetti AC50B or EcoFlow RIVER 2 Pro (700)?
- The EcoFlow RIVER 2 Pro (700), by 228 Wh — 381 Wh versus 609 Wh, a 60% advantage. At a 60 W load that is roughly 3.8 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 Bluetti AC50B or EcoFlow RIVER 2 Pro (700)?
- The EcoFlow RIVER 2 Pro (700): 700 W versus 800 W continuous. That gap matters only if a load sits between the two numbers — below 700 W both run it, above 800 W neither does. Only the EcoFlow RIVER 2 Pro (700) publishes a sourced surge figure (1,600 W); the Bluetti AC50B has no sourced surge figure, so startup capability is only half-answered here — check the missing side before planning around a motor or compressor load.
- How does runtime compare between the Bluetti AC50B and EcoFlow RIVER 2 Pro (700)?
- On the same sourced load — a refrigerator (full-size) — the EcoFlow RIVER 2 Pro (700) runs longer: 9.7 hours against 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 Bluetti AC50B or EcoFlow RIVER 2 Pro (700)?
- The Bluetti AC50B, by 1.1 kg (6.7 kg versus 7.8 kg). Both weights are manufacturer figures for the bare unit; cables and a solar panel add to whatever you actually carry.
- Which model should I buy for my use case?
- On the sub-scores that describe each use case: the EcoFlow RIVER 2 Pro (700) for home backup. One model leads every use case we score here, which makes this an unusually clean choice.
Keep deciding
- Full scorecard, specs & price for Bluetti AC50B →
- Full scorecard, specs & price for EcoFlow RIVER 2 Pro (700) →
- See more alternatives to Bluetti AC50B →
- See more alternatives to EcoFlow RIVER 2 Pro (700) →
- 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 →