EcoFlow DELTA 3 1500 vs EcoFlow DELTA 3 Max
Technical comparison · Home backup
Same family, same 500 W solar input: the choice is between a unit you can expand and one that is more powerful and quieter but fixed in capacity. The DELTA 3 1500 grows to 5.5 kWh with add-on batteries, the DELTA 3 Max stays at 2.05 kWh; manufacturer-declared values.
| Parameter | ||
|---|---|---|
| In brief | ||
| Nominal capacity | 1.536 kWh | 2.048 kWh |
| Continuous output | 1800 W | 2400 W |
| Peak output | 3600 W | 4800 W |
| Cell chemistry | LFP (lithium iron phosphate) | LFP (lithium iron phosphate) |
| Cost per kWh | 845.7 €/kWh | 634.28 €/kWh |
| List price | 1299 € | 1299 € |
| Weight | — | 20.3 kg |
| Dimensions (W×D×H) | 21.3 × 39.8 × 28.15 cm | 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 | 70 % | — |
| Warranty | 5 anni | 3 anni |
| The numbers | ||
| Cost of stored energy | 0.463 €/kWh | 0.579 €/kWh |
| Energy density | — | 100.9 Wh/kg |
| Power-to-capacity ratio | 1.17 C | 1.17 C |
| Identity | ||
| Use tier | F2 — Room-sized (1–3 kWh) | F2 — Room-sized (1–3 kWh) |
| Price | ||
| Price | 1299 € | ~1000–2200 € |
| Category specs | ||
| Expandable | Yes | No |
| Maximum expanded capacity | 5.5 kWh | — |
| Fastest USB-C | 100 W | 100 W |
| Maximum charge power | 1.5 kW | 2.3 kW |
| 0–80% charge time | 60 min | — |
| Maximum solar input | 500 W | 500 W |
| Backup power | UPS | UPS |
| Switchover time | 15 ms | 10 ms |
| Ingress protection | IP54 | IP20 |
| Mounting | Portable | Portable |
| Noise level | 45 dB | 25 dB |
The differences that matter
- Expandable to 5.5 kWh vs fixed capacity → anyone planning to grow over time starts from the 1500, not the Max.
- Grid charging 1.5 kW vs 2.3 kW → the Max refills faster from the wall.
- Noise 45 dB vs 25 dB → the Max can run in a lived-in room.
- Warranty 5 years vs 3 → the 1500 is covered two years longer.
Which one to choose
Choose EcoFlow DELTA 3 1500 if…
you start at 1.54 kWh and plan to add capacity later, up to 5.5 kWh, or you need IP54 protection. You accept 1800 W continuous, grid charging limited to 1.5 kW and a fan that reaches 45 dB; the warranty is five years.
Choose EcoFlow DELTA 3 Max if…
you need 2400 W continuous and grid charging up to 2.3 kW, and the unit sits where you sleep or work: 25 dB. It cannot be expanded, protection is IP20 and the warranty is three years instead of five.
Where to buy
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