ALLPOWERS R3500
#19 in Home backupFull review
For home backup on a budget where the unit stays in one place, with room for a second battery later.
ALLPOWERS $1,424$1,424
The ALLPOWERS R3500 and the EcoFlow DELTA 3 Ultra are evenly matched, rated 3.7 and 3.7. The ALLPOWERS R3500 leads on battery life, solar input and features. The EcoFlow DELTA 3 Ultra wins on portability and AC output. The EcoFlow DELTA 3 Ultra costs $75 less ($1,349 vs $1,424).
EcoFlow DELTA 3 Ultra
#22 in Home backupFull review
A wheeled 3kWh station for home backup or RV use at a lower price than its expandable sibling. Buy it if 3kWh is enough and you charge mostly from the wall.
Amazon $1,699 EcoFlow $1,349$1,349
Prices were last checked October 24, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the ALLPOWERS R3500 for battery life (LiFePO4, 3,500 cycles, 5-year warranty vs LiFePO4, 5-year warranty), solar input (2,000 W max solar input vs 800 W max solar input) and features (UPS (15 ms), expandable, 100 W USB-C, app vs UPS (10 ms), 140 W USB-C, app).
- Choose the EcoFlow DELTA 3 Ultra for portability (94 Wh per kg (72.1 lb (32.7 kg)) vs 75 Wh per kg (93 lb (42 kg))) and AC output (3,600 W continuous AC vs 3,200 W continuous AC).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every home backup portable power station; a clear win is highlighted. How we rank explains each one.
| Factor weight | ALLPOWERS R3500 | EcoFlow DELTA 3 Ultra |
|---|---|---|
| Overall rating | 3.7/5 | 3.7/5 |
| Value 25% | 77 $0.45 per rated Wh | 79 $0.44 per rated Wh |
| Tested capacity 15% | 50 not yet independently tested (neutral score used) | 55 82% of rated capacity delivered (1 test) |
| Battery life 15% | 96 LiFePO4, 3,500 cycles, 5-year warranty | 70 LiFePO4, 5-year warranty |
| AC output 15% | 26 3,200 W continuous AC | 37 3,600 W continuous AC |
| Charging speed 10% | 50 full AC charge time not published (neutral score used) | 50 full AC charge time not published (neutral score used) |
| Portability 10% | 55 75 Wh per kg (93 lb (42 kg)) | 89 94 Wh per kg (72.1 lb (32.7 kg)) |
| Solar input 5% | 57 2,000 W max solar input | 13 800 W max solar input |
| Features 5% | 100 UPS (15 ms), expandable, 100 W USB-C, app | 75 UPS (10 ms), 140 W USB-C, app |
Independent capacity tests
ALLPOWERS R3500
No independent test published yet.
EcoFlow DELTA 3 Ultra
| Tested by | Usable AC energy | Of rated | Conditions |
|---|---|---|---|
| The Solar Lab | - | 82% | Efficiency test (load not stated in the review). Measured AC recharge 0-100% in 2 h from a standard household outlet. |
Specifications
| ALLPOWERS R3500 | EcoFlow DELTA 3 Ultra | |
|---|---|---|
| Battery | ||
| Rated capacity | 3,168 Wh | 3,072 Wh |
| Tested usable capacity | - | 2,519 Wh (82%) |
| Chemistry | LiFePO4 | LiFePO4 |
| Cycle life | 3,500 3,500+ cycles (manufacturer; end-of-life capacity not stated) | - |
| Expandable | Yes, up to 6,336 Wh | No |
| Output | ||
| AC output | 3,200 W (6,000 W surge) | 3,600 W (7,200 W surge) |
| Boost mode (resistive loads) | - | 4,600 W |
| AC outlets | 5 total | 5 total |
| 120V 20A outlets (NEMA 5-20R) | 4 | 4 |
| RV 30A outlet (TT-30R) | 1 | 1 |
| AC waveform | Pure sine wave | Pure sine wave |
| USB-C ports | 2 (up to 100 W each) | 3 (up to 140 W each) |
| USB-A ports | 4 | 1 |
| 12 V car outlet | Yes | Yes |
| DC5521 ports | - | 0 |
| UPS / pass-through | Yes (15 ms switchover) | Yes (10 ms switchover) |
| Charging | ||
| AC charging | 1,500 W | 1,800 W |
| Max solar input | 2,000 W | 800 W |
| Solar input voltage | 12-150V, 40A (XT60) | - |
| Build | ||
| Weight | 93 lb (42 kg) | 72.1 lb (32.7 kg) |
| Dimensions | 20.86 x 14.17 x 13.58 in | 626 x 328 x 395 mm |
| App | ALLPOWERS app (Wi-Fi/Bluetooth) | EcoFlow app (Wi-Fi and Bluetooth) |
| Warranty | 5 years | 5 years |
| Released | 2023-04 | 2025-09 |