EcoFlow
EcoFlow DELTA 2
$479 · Lifetime $0.16/kWh over 3,000 rated cycles · MSRP $699Price not independently confirmed — check the retailer before buying.
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What it actually runs
Usable energy ≈ 870 Wh after our standard 85% inverter-efficiency assumption. Methodology
| CPAP overnightCPAP, humidifier off (40 W × 8 h) | ~22 h continuous · 2.7 days at typical daily use |
|---|---|
| EssentialsFridge + wifi + 3 lights (~190 W continuous) | ~4.6 h continuous · 0.5 days at typical daily use |
| Storm kitFridge + sump pump + lights + phones (~1,000 W) | ~0.9 h continuous · 0.2 days at typical daily use |
| Quick equivalents | ≈ 2 CPAP nights · 6 h of fridge · 44 phone charges |
How long will it run YOUR appliance?
Solar recharge
The DELTA 2 accepts up to 500 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 | 1,024 Wh |
|---|---|
| Usable (85%) | 870 Wh |
| AC output | 1,800 W |
| Surge output | 2,700 W |
| Max solar input | 500 W |
| Outage switchover | Basic EPS, 30 ms (maker excludes life-support use) |
| Output waveform | Pure sine wave |
| Battery chemistry | LiFePO4 (LFP) |
| Expandable battery | Yes |
| Rated cycles | 3,000 |
| Third-party solar | MC4 panels supported |
| Lifetime cost | $0.16/kWh |
Alternatives to consider
- EcoFlow DELTA 3 Plus — 1,024 Wh / 1,800 W at $719 · compare head-to-head →
- Goal Zero Yeti 1000X — 997 Wh / 1,500 W at $999.95 · compare head-to-head →
Common questions
How long will the EcoFlow DELTA 2 run a refrigerator?
About 6 hours of compressor running time — which at a realistic duty cycle covers roughly 0.7 days of normal fridge use. Estimates use usable capacity (85% of rated) and carry ±15%.
Can the DELTA 2 run a CPAP?
Yes — a 40 W CPAP runs about 2 full nights per charge without humidification. A heated humidifier roughly triples the draw and cuts nights to ~0.
Can it run a space heater?
Yes on output — a 1,500 W heater draws within this unit's 1,800 W rating — but only for ~0.6 hours. Resistive heat is the fastest way to drain any battery; an electric blanket (100 W) runs ~9 hours instead.
How fast does the DELTA 2 recharge from solar?
At its 500 W input cap, roughly 2.6 hours of good sun for a full refill (real-world 80% derate applied). Cloud cover stretches that substantially.