EcoFlow
EcoFlow DELTA Pro 3
$2,799 · Lifetime $0.17/kWh over 4,000 rated cycles · MSRP $3,699Checked against EcoFlow's product page today.
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What it actually runs
Usable energy ≈ 3,482 Wh after our standard 85% inverter-efficiency assumption. Methodology
| CPAP overnightCPAP, humidifier off (40 W × 8 h) | ~87 h continuous · 10.9 days at typical daily use |
|---|---|
| EssentialsFridge + wifi + 3 lights (~190 W continuous) | ~18 h continuous · 2.1 days at typical daily use |
| Storm kitFridge + sump pump + lights + phones (~1,000 W) | ~3.5 h continuous · 0.8 days at typical daily use |
| Quick equivalents | ≈ 10 CPAP nights · 23 h of fridge · 174 phone charges |
How long will it run YOUR appliance?
Solar recharge
The DELTA Pro 3 accepts up to 2,600 W of solar input — panels beyond that sit idle. To sustain an essentials load (~1,680 Wh/day) off-grid you'd need roughly 470 W of panels, within this unit’s cap — sun permitting, it can run essentials indefinitely.
Compatible kits: EcoFlow 220W Bifacial (220 W) · EcoFlow 400W Portable (400 W) · Renogy 200W Rigid (MC4) (200 W) · Rich Solar 400W Kit (MC4) (400 W) · Bluetti PV420 (420 W) · Anker SOLIX PS400 (400 W) · EcoFlow NextGen 160W (160 W) · Renogy 400W Portable Suitcase (400 W).
Specifications
| Capacity | 4,096 Wh |
|---|---|
| Usable (85%) | 3,482 Wh |
| AC output | 4,000 W |
| Surge output | 8,000 W |
| Max solar input | 2,600 W |
| Outage switchover | UPS mode, 10 ms |
| Output waveform | Pure sine wave |
| Battery chemistry | LiFePO4 (LFP) |
| Expandable battery | Yes |
| Rated cycles | 4,000 |
| Third-party solar | MC4 panels supported |
| Lifetime cost | $0.17/kWh |
Alternatives to consider
- Goal Zero Yeti PRO 4000 — 3,994 Wh / 3,600 W at $3,999.95 · compare head-to-head →
- Anker SOLIX F3800 Plus — 3,840 Wh / 6,000 W at $2,300 · compare head-to-head →
Common questions
How long will the EcoFlow DELTA Pro 3 run a refrigerator?
About 23 hours of compressor running time — which at a realistic duty cycle covers roughly 2.9 days of normal fridge use. Estimates use usable capacity (85% of rated) and carry ±15%.
Can the DELTA Pro 3 run a CPAP?
Yes — a 40 W CPAP runs about 10 full nights per charge without humidification. A heated humidifier roughly triples the draw and cuts nights to ~3.
Can it run a space heater?
Yes on output — a 1,500 W heater draws within this unit's 4,000 W rating — but only for ~2.3 hours. Resistive heat is the fastest way to drain any battery; an electric blanket (100 W) runs ~35 hours instead.
How fast does the DELTA Pro 3 recharge from solar?
At its 2,600 W input cap, roughly 2.0 hours of good sun for a full refill (real-world 80% derate applied). Cloud cover stretches that substantially.