Head to head · Updated Sep 27, 2026
EcoFlow DELTA 3 vs EcoFlow DELTA 3 Classic
Same 1,024 Wh battery and 1,800 W inverter. The DELTA 3 adds an expansion port, two more AC outlets and alternator charging for $100 more.
EcoFlow
EcoFlow DELTA 3
- Capacity
- 1,024 Wh
- Output
- 1,800 W
- Weight
- 27.5 lb
- Recharge
- —
EcoFlow
EcoFlow DELTA 3 Classic
- Capacity
- 1,024 Wh
- Output
- 1,800 W
- Weight
- 26.7 lb
- Recharge
- 80% in 45 min
Quick verdict
Which one should you buy?
Most buyers should get the Classic; pay for the DELTA 3 only if you'll use the expansion port.
Choose the EcoFlow DELTA 3 if…
You want to expand to 5 kWh later, need six AC outlets and 13 outputs, or plan to charge from a vehicle's alternator.
Check priceChoose the EcoFlow DELTA 3 Classic if…
You want the same core power station for $100 less and don't need expansion.
Check priceEditor scores
How they stack up
- EcoFlow DELTA 3
- EcoFlow DELTA 3 Classic
Key differences
By the numbers
- EcoFlow DELTA 3 Classic costs less: $499.00 vs $599.00 ($100 difference, Amazon prices as of Sep 27, 2026)
- EcoFlow DELTA 3 Classic is lighter: 26.7 lb vs 27.5 lb
- EcoFlow DELTA 3 Classic costs less per watt-hour: $0.49 vs $0.58
Full specs
Spec by spec
| Spec | EcoFlow DELTA 3 | EcoFlow DELTA 3 Classic |
|---|---|---|
| Battery | ||
| Capacity | 1,024 Wh | 1,024 Wh |
| Battery chemistry | LiFePO4 | LiFePO4 |
| Rated cycles | 4,000 cycles | — |
| Expandable to | 5,000 Wh | — |
| Output | ||
| AC output (continuous) | 1,800 W | 1,800 W |
| Surge / peak | 3,600 W | 3,600 W |
| AC outlets | 6 | 4 |
| Fastest USB-C port | 100 W | 100 W |
| Charging | ||
| Max AC charging input | 1,500 W | — |
| Charging speed (claimed) | Full in 56 min using wall + 500 W solar together | 0–80% in 45 min from the wall |
| Max solar input | 500 W | 500 W |
| UPS switchover | — | 10 ms |
| Size & build | ||
| Weight | 27.5 lb | 26.7 lb |
| Dimensions | 15.7 × 8 × 11.2 in | 15.7 × 7.9 × 11.1 in |
| Noise (claimed) | — | 30 dB |
| Other | ||
| App control | EcoFlow app | EcoFlow app |
| Warranty | 5 years | 5 years |
| Editor scores (0–10) | ||
| Capacity | 6 | 6 |
| Output | 8 | 8 |
| Charging | 9 | 8 |
| Solar input | 7 | 7 |
| Portability | 4 | 4 |
| Battery life | 9 | 7 |
| Value | 7 | 9 |
| Overall editor score | 7.2 | 7.2 |
“Best” marks the stronger value in each row. A dash means the value isn’t published. EcoFlow DELTA 3 wins 1 spec row, EcoFlow DELTA 3 Classic wins 1. Scores follow our rating rules.
Pros & cons
What owners and specs say
EcoFlow DELTA 3
- Expandable to 5 kWh
- 6 AC outlets, 13 outputs
- 4,000 cycles to 80%
- Sold by Amazon
- $100 more than the Classic
- 500 W max solar
- UPS time not listed
EcoFlow DELTA 3 Classic
- 1,800 W, 3,600 W surge
- 10 ms UPS
- 80% in 45 minutes
- 90% five-star ratings
- Not expandable
- Heavier than Anker and BLUETTI rivals
- Cycle rating not stated on the listing
Frequently asked questions
Can the DELTA 3 Classic use extra batteries?
No. EcoFlow says it isn't compatible with DELTA 2 or DELTA 3 extra batteries.
Do they charge at the same speed?
Both reach 80% in about 45 minutes from the wall; the DELTA 3 can also combine wall and solar for a full charge in 56 minutes.
Which has the better UPS?
The Classic lists a 10 ms UPS. The DELTA 3's listing doesn't state a switchover time.
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