EcoFlow DELTA 3: runtime & specs
1,024 Wh · 1,800 W continuous AC · 500 W max solar input · LFP (LiFePO4). Specs below are the manufacturer's published figures — continuous and surge watts are separate numbers here, because they are separate numbers in reality.
Manufacturer specifications
| Capacity | 1,024 Wh |
|---|---|
| Maximum capacity with expansion | 5,120 Wh |
| AC output (continuous) | 1,800 W |
| AC output (surge) | 3,600 W |
| Boost mode | — |
| Maximum solar input | 500 W |
| Solar input voltage range | 11-60V |
| Battery chemistry | LFP (LiFePO4) |
| Cycle life | 4,000 cycles to 80% capacity |
| AC charging input (max) | 1,500 W |
| Weight | 27.6 lbs |
Source: manufacturer spec sheet via an authorized dealer · pulled 2026-10-19. Expansion: Supports EcoFlow extra batteries, up to 5kWh total. If a row says "not published", the manufacturer doesn't publish that figure in the source we retrieved — we leave it blank rather than guess.
What it runs, and for how long
Estimates use our published formula — capacity × 0.85 ÷ load, duty cycle applied to cycling loads, and a start check against the surge rating (methodology). Loads that fail the start check are marked, not given a fake runtime.
| Load | Estimated runtime |
|---|
Try your own load
EcoFlow DELTA 3 questions
How long will the EcoFlow DELTA 3 run a refrigerator?
About 3.1 hours for a typical fridge at a 40% compressor duty cycle (700 W nameplate draw while running), using our standard formula: 1,024 Wh × 0.85 ÷ 280 W average. That is the duty-cycled figure; the same station runs the fridge for about 1.2 hours if the compressor never cycles off.
How long will it run a CPAP?
About 21.8 hours at 40 W — a typical CPAP without a heated humidifier — or roughly 2.7 nights at 8 hours a night. With a heated humidifier (~90 W) expect about 9.7 hours. That's device runtime math only; see the CPAP calculator for your device's actual wattage.
How long does it take to recharge from solar?
With 400 W of panels, the EcoFlow DELTA 3 needs about 3.3 hours of full sun for a full charge after the 0.78 real-world derate. Try other panel sizes in the solar charging calculator.
WattLong is reader-supported. Some links on this site are affiliate links: if you buy through them, we may earn a commission at no extra cost to you. See our affiliate disclosure. All results are estimates — verify with the manufacturer and a licensed electrician before relying on them.