BLUETTI AC240 vs EcoFlow DELTA Pro Ultra
Technical comparison · High capacity
Two lithium iron phosphate power stations of very different size: the BLUETTI AC240 stores about 1.5 kWh, the EcoFlow DELTA Pro Ultra over 6 kWh, going by manufacturer-declared figures. The choice comes down to how many appliances must stay on together during an outage, and for how long.
| Parameter | ||
|---|---|---|
| Awards | — | |
| In brief | ||
| Nominal capacity | 1.536 kWh | 6.144 kWh |
| Continuous output | 2400 W | 6900 W |
| Peak output | 3600 W | — |
| Cell chemistry | LFP (lithium iron phosphate) | LFP (lithium iron phosphate) |
| Cost per kWh | 1041.02 €/kWh | 829.75 €/kWh |
| List price | 1599 € | 5098 € |
| Weight | 33 kg | — |
| Dimensions (W×D×H) | 41.95 × 29.35 × 40.95 cm | — |
| Outlets | ||
| AC outlets | Yes (×4) | Yes (×5) |
| How long it lasts | ||
| Battery life cycles | 2190 cicli | 1825 cicli |
| The limit that runs out first | anni di garanzia | anni di garanzia |
| Rated cycles | 3500 cicli | 3500 cicli |
| Capacity at end of cycle life | 80 % | 80 % |
| Warranty | 6 anni | 5 anni |
| The numbers | ||
| Cost of stored energy | 0.475 €/kWh | 0.455 €/kWh |
| Energy density | 46.5 Wh/kg | — |
| Power-to-capacity ratio | 1.56 C | 1.12 C |
| Identity | ||
| Use tier | F2 — Room-sized (1–3 kWh) | F3 — Flat-sized (3–8 kWh) |
| Price | ||
| Price | 1599 € | — |
| Universal specs | ||
| Voltage | — | 220 V |
| Category specs | ||
| Expandable | Yes | Yes |
| Maximum expanded capacity | 10.136 kWh | 30 kWh |
| Fastest USB-C | 100 W | 100 W |
| 0–80% charge time | 45 min | — |
| Maximum solar input | 1200 W | 4000 W |
| Backup power | UPS | UPS |
| Switchover time | 15 ms | 20 ms |
| Ingress protection | IP65 | IP54 |
| Mounting | Portable | Portable |
| Minimum temperature | -20 °C | -20 °C |
| Maximum temperature | 40 °C | 45 °C |
| Cell heating | — | Yes |
| Noise level | 53 dB | 30 dB |
| Wheels and handle | — | Yes |
| Declared standards | CE | CE, IEC 62619, IEC 62477 |
JouleSpecs Awards
No awards in this tier.
Most capable Flat-sized (3–8 kWh)
Highest technical score among the 4 sheets in the High capacity category (flat-sized tier): 86/100.
How we assign awards →The differences that matter
- Capacity, 1.5 kWh vs over 6 kWh → the first covers a few hours for a few appliances; the second keeps an apartment going much longer.
- Continuous output, 2400 W vs 6900 W → on the first, an induction hob and a kettle together exceed the limit; the second runs them in parallel.
- Solar input, 1200 W vs 4000 W → the first recharges from a few panels; the second can use a large array.
- Noise, 53 dB vs 30 dB → the first's fan is audible in the room; the second stays close to silent.
Which one to choose
Choose BLUETTI AC240 if…
you want to keep a router, a computer and a few lights running in one room, or bring power to a shed: 33 kg and 2400 W are enough, with a 6-year warranty and IP65 protection. The trade-off is a 1.5 kWh reserve that lasts under an hour near full load, and a solar input capped at 1200 W.
Choose EcoFlow DELTA Pro Ultra if…
you need to run several loads at once in an apartment during a blackout: 6900 W and over 6 kWh, wheels and a handle to move it, solar charging up to 4000 W and 30 dB against 53 dB for the other. You accept IP54 instead of IP65 and a 5-year warranty instead of 6.
Where to buy
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