EcoFlow DELTA 2 vs EcoFlow DELTA 3 Max
Technical comparison · Home backup
Same brand, same room-sized use at home: the choice is between starting at 1 kWh with the option to expand, or taking 2 kWh straight away in a single unit that cannot be expanded. Values are declared by the manufacturer.
| Parameter | ||
|---|---|---|
| In brief | ||
| Nominal capacity | 1.024 kWh | 2.048 kWh |
| Continuous output | 1800 W | 2400 W |
| Peak output | 2700 W | 4800 W |
| Cell chemistry | LFP (lithium iron phosphate) | LFP (lithium iron phosphate) |
| Cost per kWh | 584.96 €/kWh | 634.28 €/kWh |
| List price | 599 € | 1299 € |
| Weight | 12 kg | 20.3 kg |
| Dimensions (W×D×H) | — | 49.4 × 23.9 × 30.5 cm |
| Outlets | ||
| AC outlets | Yes (×4) | Yes (×4) |
| How long it lasts | ||
| Battery life cycles | 1825 cicli | 1095 cicli |
| The limit that runs out first | anni di garanzia | anni di garanzia |
| Rated cycles | 3000 cicli | — |
| Capacity at end of cycle life | 80 % | — |
| Warranty | 5 anni | 3 anni |
| The numbers | ||
| Cost of stored energy | 0.321 €/kWh | 0.579 €/kWh |
| Energy density | 85.3 Wh/kg | 100.9 Wh/kg |
| Power-to-capacity ratio | 1.76 C | 1.17 C |
| Identity | ||
| Use tier | F2 — Room-sized (1–3 kWh) | F2 — Room-sized (1–3 kWh) |
| Price | ||
| Price | — | ~1000–2200 € |
| Universal specs | ||
| Voltage | 220 V | — |
| Category specs | ||
| Expandable | Yes | No |
| Fastest USB-C | 100 W | 100 W |
| Maximum charge power | 1.2 kW | 2.3 kW |
| Maximum solar input | 500 W | 500 W |
| Backup power | EPS (brief interruption) | UPS |
| Switchover time | 30 ms | 10 ms |
| Ingress protection | — | IP20 |
| Mounting | Portable | Portable |
| Minimum temperature | -10 °C | — |
| Maximum temperature | 45 °C | — |
| Noise level | — | 25 dB |
The differences that matter
- 1.024 kWh versus 2.048 kWh → at the same load the 3 Max lasts about twice as long (in theory, ignoring losses).
- Expandable yes versus no → the DELTA 2 grows with extra modules, the 3 Max stays at the capacity it has.
- Warranty 5 years versus 3 → the DELTA 2 is covered for two years longer.
- 30 ms switchover (EPS) versus 10 ms (UPS) → the 3 Max works as an uninterruptible supply; with the DELTA 2 there is a brief gap when it switches to battery.
Which one to choose
Choose EcoFlow DELTA 2 if…
you start with a single kWh, to keep a few devices running during an outage, and want to add capacity later. It weighs 12 kg against 20.3, so it is easier to move between rooms. The trade-off: mains charging tops out at 1.2 kW and peak output at 2700 W.
Choose EcoFlow DELTA 3 Max if…
you want 2 kWh already in one unit, with peaks up to 4800 W and mains charging up to 2.3 kW. The trade-off: it cannot be expanded, so today's capacity is the final one, and the warranty is shorter.
Where to buy
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