EcoFlow RIVER 3
55BatteryRank score · Balanced
$179as of
Great price← CompareCheck price on Amazon 
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EcoFlow RIVER 3 vs EnginStar R300
Decision readout
Better station
Compare the sourced facts — a complete score is not available for both stations.
Better buy today
No price tie-breaker today — choose based on fit and the sourced details.
EnginStar R300
N/ABatteryRank score
$129.98as of
Insufficient price historyWhat changes the decision
- Home backup: EnginStar R300 — more AC-delivered capacity
- Camping & RV: EnginStar R300 — lighter and easier to carry
01 · Score evidence
Score breakdown
55
EcoFlow RIVER 3
Overall
N/A
EnginStar R300
32
POWER
EnginStar R300 +12
44
Battery-side usable capacity and how much you can run at once.
74
TRUST
Incomplete data
N/A
Owner reputation, safety record, warranty, and build durability.
63
CHARGING
Incomplete data
N/A
Wall and solar recharge speed.
64
LIVABILITY
EnginStar R300 +8
72
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 RIVER 3
Rated (on the box)
245 Wh. Show source
claimed sourceus.ecoflow.com ↗2026-07-04The marketing number — total cell capacity.
AC delivered (est.)
208 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.
EnginStar R300
Rated (on the box)
296 Wh. Show source
claimed sourcem.media-amazon.com ↗2026-07-27The marketing number — total cell capacity.
AC delivered (est.)
226 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 RIVER 3 | EnginStar R300 | Assumption |
|---|---|---|---|
| CPAP (humidifier off) | about 2.9 nights | about 3.1 nights | 9 W · |
| CPAP (heated humidifier on) | about 0.5 nights | about 0.5 nights | 56 W · |
| Refrigerator (full-size) | about 3.3 hours | about 3.6 hours | 180 W × 35% duty cycle · |
| Wi-Fi router + modem | about 12 hours | about 13 hours | 18 W · |
| Laptop (65W charger) | about 6.4 hours | about 7.0 hours | 65 W × 50% duty cycle · |
| Phone (one full charge) | about 10 full charges | about 11 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 RIVER 3 | EnginStar R300 |
|---|---|---|
| AC-delivered capacity | 208 Whest.. Show sourceestimated sourceus.ecoflow.com ↗2026-07-04 | 226 Whest.. Show sourceestimated sourcem.media-amazon.com ↗2026-07-27 |
| Continuous power output | 300 W. Show sourceclaimed sourceus.ecoflow.com ↗ | 300 W. Show sourceclaimed sourcem.media-amazon.com ↗ |
| Surge power output | 600 W. Show sourceclaimed sourceus.ecoflow.com ↗ | 500 W. Show sourceclaimed sourcem.media-amazon.com ↗ |
| Max solar input | 110 W. Show sourceclaimed sourceus.ecoflow.com ↗ | — |
| AC charge time (0–100%) | 60 min. Show sourceclaimed sourceus.ecoflow.com ↗ | — |
| Weight | 3.54 kg. Show sourceclaimed sourceus.ecoflow.com ↗ | 2.95 kg. Show sourceclaimed sourcem.media-amazon.com ↗ |
| Rated cycle life | 3,000 cycles. Show sourceclaimed sourceus.ecoflow.com ↗ | — |
Only show differences
- AC-delivered capacity208 Wh226 Wh
- Surge power output600 W500 W
- Max solar input110 W—
- AC charge time (0–100%)60 min—
- Weight3.54 kg2.95 kg
- Rated cycle life3,000 cycles—
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
EnginStar R300
$129.98as of Insufficient price history
Each verdict compares today's price against that model's own tracked history — never MSRP theater.
Where these rank
- EcoFlow RIVER 3 #5 of 10 in Best 300 Wh Stations · #8 of 8 in Quietest Power Stations
Quick answers
- Is the EcoFlow RIVER 3 better than the EnginStar R300?
- Compare the sourced facts — a complete score is not available for both stations. No price tie-breaker today — choose based on fit and the sourced details.
- Which has more usable capacity, the EcoFlow RIVER 3 or EnginStar R300?
- The EnginStar R300, by 18 Wh — 208 Wh versus 226 Wh, a 9% advantage. At a 60 W load that is roughly 0.3 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 RIVER 3 or EnginStar R300?
- Neither — both are rated 300 W continuous, so any load one can run, the other can too. Surge headroom follows the same order: 600 W against 500 W, and surge is what decides whether a compressor or pump actually starts.
- How does runtime compare between the EcoFlow RIVER 3 and EnginStar R300?
- On the same sourced load — a refrigerator (full-size) — the EnginStar R300 runs longer: 3.6 hours against 3.3. 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 RIVER 3 or EnginStar R300?
- The EnginStar R300, by 0.6 kg (3 kg versus 3.5 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 EnginStar R300 for home backup, camping & rv. One model leads every use case we score here, which makes this an unusually clean choice.
Keep deciding
- Full scorecard, specs & price for EcoFlow RIVER 3 →
- Full scorecard, specs & price for EnginStar R300 →
- See more alternatives to EcoFlow RIVER 3 →
- See more alternatives to EnginStar R300 →
- 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 →